Gas separation cell with disc-shaped electrode

Abstract

The present invention relates to a gas separation cell (10) for separating a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture, in particular a gas mixture, containing the Lewis acid, which comprises an adsorption electrode (20) with at least one electrochemically active material for the reversible electrochemical adsorption of the Lewis acid, a counter electrode (30) and a separator (40) arranged between the adsorption electrode (20) and the counter electrode (30), as well as an inlet (50) for introducing the fluid mixture (1) into the gas separation cell (10) and / or into a gas separation system (100) consisting of at least two cells (10).To provide a new type of gas separation cell, in particular one that can be used for electrochemical swing adsorption (ESA), the inlet (50) is at least partially formed by at least one inlet opening (21, 31, 41) in the form of a through-hole in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40). Furthermore, the invention relates to such a gas separation system as well as an electrode (20, 30), a separator (40), and a bipolar plate (70) therefor.

Description

[0001] The present invention relates to a gas separation cell for separating a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture containing the Lewis acid, a gas separation system, and an electrode, a separator and a bipolar plate therefor. State of the art

[0002] Carbon dioxide is an electrophilic electron pair acceptor and is therefore a Lewis acid.

[0003] The separation of carbon dioxide from process gas streams or atmospheric air is also known as carbon capture.

[0004] Hatton et al. describe a gas capture cell for carbon dioxide capture in their scientific publication Energy Environ. Sci., 2019, 12, 3530. This cell can be operated using electrochemical swing adsorption (ESA). The gas capture cell comprises an adsorption electrode based on polyanthraquinone-functionalized carbon nanotubes (PAQ-CNTs) and a counter electrode based on polyvinyl ferrocene-functionalized carbon nanotubes (PVFc-CNTs). Carbon dioxide is bound at the adsorption electrode through the reaction of electrons. The necessary electrical charge balance is achieved via the counter electrode, which is based on polyvinyl ferrocene-functionalized carbon nanotubes and supplies electrons from the ferrocene.Charge equalization between the adsorption electrode and the counter electrode occurs via the ion mobility of an ionic liquid with which both electrodes are impregnated. A separator in the form of a porous membrane made of an insulating material, impregnated with the ionic liquid, is positioned between the electrodes. This separator both isolates the electron conduction between the two electrode compartments and simultaneously connects them via diffusion of the ionic liquid through its pores, thus enabling ion conduction.

[0005] Document US 2022 / 0339579 A1 describes a method for the electrochemical deposition of a gaseous Lewis acid from a fluid mixture containing the Lewis acid. Disclosure of the invention

[0006] The present invention relates to a gas separation cell, in particular an electrochemical gas separation cell, for the - in particular electrochemical - separation of a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture, in particular a gas mixture, containing the Lewis acid.

[0007] A Lewis acid can be understood in particular as an electrophilic electron pair acceptor, i.e. a compound to which an electron pair of an electron pair donor can be attached, for example in which the compound has an empty orbital that is energetically accessible to the electron pair of the electron pair donor.

[0008] The gas separation cell comprises, in particular, an adsorption electrode with at least one electrochemically active material for the reversible electrochemical adsorption of the Lewis acid, for example carbon dioxide, a counter electrode, for example with at least one electrochemically active material for charge balancing of the adsorption electrode, and a separator arranged between the adsorption electrode and the counter electrode.

[0009] The gas separation cell further includes, in particular, an inlet for introducing the fluid mixture, especially into the gas separation cell and / or into a gas separation system consisting of at least two (of these / such) cells.

[0010] In particular, the inlet is formed at least partially by at least one inlet opening in the form of a continuous recess in the adsorption electrode and / or in the counter electrode and / or in the separator.

[0011] Advantageously, a novel gas separation cell, particularly one with a novel geometry, can be provided, especially one that enables a novel and advantageous design of a gas separation system based thereon. Based on such a gas separation cell, a gas separation system, particularly one that saves installation space, can advantageously be constructed in a simple and cost-effective manner. In this system, the inlet extends in a direction essentially perpendicular to the planes of the electrodes. This allows the gas separation system to be mounted or integrated into a system to be equipped with it in a particularly simple manner, especially without the need to connect inlet and outlet ports, for example, by simply inserting it into an existing pipe, as will be explained in more detail later.

[0012] Furthermore, this type of design advantageously eliminates the need for a conventional circumferential seal, for example, at the edge of the bipolar plates. This avoids the additional costs associated with such seals, such as creating sealing surfaces, additional production costs (e.g., for providing and inserting a seal), and / or related problems such as leakage issues, potential leak points, frictional connection problems, and problems with differing material elasticities and strain distributions.

[0013] Furthermore, such a gas separation cell can advantageously be significantly more efficient than conventional gas separation cells, which usually have equally sized inlet and outlet openings and therefore a homogeneous fluid flow through the cell, especially via the adsorption electrode.

[0014] This can be explained in particular by the fact that when the Lewis acid is adsorbed from the fluid mixture by the adsorption electrode, the Lewis acid concentration in the fluid mixture decreases from the inlet side along the length of the adsorption electrode to the outlet side, but with a homogeneous fluid flow, especially with a homogeneous or constant flow velocity, in conventional gas separation cells with equally sized inlet and outlet openings, the exposure time of the Lewis acid-containing fluid mixture is essentially constant along the length of the adsorption electrode, particularly due to the homogeneity of the fluid flow.In such conventional cells, this leads to a situation where, due to the higher inlet-side Lewis acid concentration in the fluid mixture and the lower outlet-side Lewis acid concentration in the fluid mixture, the saturation time – i.e., the time until a certain saturation of the at least one electrochemically active material of the adsorption electrode is reached – is significantly shorter on the inlet side than on the outlet side, and, for example, the inlet-side electrochemically active material of the adsorption electrode may already be completely saturated while the outlet-side electrochemically active material of the adsorption electrode is still unsaturated, making it difficult to operate such conventional cells efficiently.

[0015] In the novel gas separation cell, however, the cross-section available for the fluid mixture can increase from the inlet opening, in particular the cross-section of the continuous recess, across the adsorption electrode, especially towards the outside, thereby reducing the flow velocity of the fluid mixture over the extent of the adsorption electrode (from the inlet side to the outlet side) and thus increasing the exposure time between the Lewis acid and the electrochemically active material of the adsorption electrode over the extent of the adsorption electrode, and in this way at least counteracting, and possibly even compensating for, the reduction of the Lewis acid concentration in the fluid mixture and the increase in the saturation time.For example, the saturation time can be adjusted by optimizing the cell design so that it is of similar or essentially the same length on the inlet and outlet sides, particularly across the length of the adsorption electrode.

[0016] The gas separation cell can be used particularly advantageously for carbon dioxide capture, and / or for electrochemical swing adsorption, in particular potential swing adsorption, or electro-swing adsorption (ESA), and / or for pH swing adsorption, and / or for electric field adsorption.

[0017] Overall, this allows for the provision of a new type of gas capture cell and gas capture system for the capture of a gaseous Lewis acid, for example carbon dioxide, in a simple, cost-effective and space-saving manner, in particular which can be used for carbon capture and / or electrochemical swing adsorption (ESA) and / or pH swing adsorption and / or electric field adsorption and can exhibit the advantages explained above.

[0018] In one embodiment, the gas separation cell further comprises a bipolar plate. The bipolar plate can be designed, in particular, for electrically conductive connection and / or for ionic insulating separation and / or for spatial separation of the gas separation cell, for example from an adjacent gas separation cell.

[0019] In a further embodiment, the inlet is at least partially formed by at least one inlet opening in the form of a continuous recess in the bipolar plate. This allows the gas separation cell to be easily integrated into a gas separation system. The bipolar plate can be positioned, in particular, between the adsorption electrode of one cell and the counter electrode of another, especially adjacent, cell.

[0020] In particular, the bipolar plate can be designed to form a deposition chamber adjacent to the adsorption electrode, especially for supplying the fluid mixture, particularly a gas mixture, to the adsorption electrode, and / or for guiding and / or directing the fluid mixture, particularly a gas mixture, over the adsorption electrode, especially from the at least one inlet opening, for example radially outwards, and / or for spacing the adsorption electrode. The at least one inlet opening, for example of the adsorption electrode and / or the bipolar plate, can, for example, open into the deposition chamber, and / or the deposition chamber can open into at least one outlet opening, for example of the adsorption electrode and / or the bipolar plate, and / or into a radially outer space, for example, a space, for example, from an inner contour of a casing, which will be explained later.

[0021] For example, the bipolar plate can have radially extending ribs to form the deposition chamber and / or to guide and / or direct the fluid mixture, in particular gas mixture, especially from the at least one inlet opening, over the adsorption electrode, and / or to space the adsorption electrode, for example to space the adsorption electrode and the bipolar plate and / or a counter electrode of another, in particular adjacent, cell.

[0022] In a further embodiment, the gas separation cell also has an inlet-side housing part. The inlet can, in particular, be formed at least partially (also) by at least one inlet opening in the form of a continuous recess in a region of the inlet-side housing part arranged above the electrodes. The term "in particular" refers only to the arrangement of this region of the inlet-side housing part with respect to the electrodes, especially with respect to the electrode surface, and is to be understood as independent of gravity. Thus, the inlet-side housing part can control the flow of the fluid mixture, and, for example, only the fluid mixture can flow into the inlet openings of the cell through the at least one inlet opening of the inlet-side housing part.The area of ​​the inlet-side housing part, equipped with at least one inlet opening and arranged above the electrodes, can be positioned, in particular with respect to the flow direction of the fluid mixture, especially a gas mixture, upstream of the electrodes and the separator, and especially upstream of the cell(s). The area of ​​the inlet-side housing part, equipped with at least one inlet opening and arranged above the electrodes, can, for example, be designed and / or arranged at least substantially parallel to the electrodes and / or the separator.

[0023] In a further embodiment, the gas separation cell (furthermore) has a casing that completely encloses the adsorption electrode, the separator, the counter electrode, and optionally also the bipolar plate. The casing can be, in particular, sleeve-shaped and / or tubular. This advantageously provides a gas separation cell or system that allows for easy assembly of the cell or system by simply inserting the casing, along with the enclosed cell components, into a tube, for example, of a system to be equipped with it.Since the inlet (as well as the outlet, which will be explained later) extends in a direction essentially perpendicular to the planes of the adsorption electrode, the counter electrode, and the separator, and these are completely enclosed by the casing, the inlet (and also the outlet, which will be explained later) extends, when the casing with the cell components contained therein is assembled in a tube, in the direction of the tube, particularly axially. This allows the fluid mixture to be separated to flow into the casing, particularly in the axial direction, at one side, which can also be called the inlet side, and out of the casing at the other side, which can also be called the outlet side. Thus, connecting inlet and outlet ports can advantageously be avoided during assembly.The casing also advantageously allows the entire cell, or a complete gas separation system built from such cells, to be easily sealed from the environment, for example, simply by closing the casing with one or two lids. This reduces the potential for leakage and eliminates the need for conventional sealing and / or gasketing of individual cell components and / or cells.

[0024] In another embodiment, the casing forms at least part of the housing of the gas separation cell. In particular, the casing can (also) form at least part of the housing of the gas separation system described later. For example, the casing can form at least one lateral housing part.

[0025] In another embodiment, the casing is partially and / or completely closed on the inlet side by the inlet-side housing part. For example, the inlet-side housing part can be an inlet-side housing cover or an inlet-side cover section of the casing. In this way, a cell and / or system housing can be provided that can be manufactured and assembled in a simple and cost-effective manner and also allows for easy maintenance and / or repair as well as simplified recycling.

[0026] In a further embodiment, the gas separation cell (furthermore) has an outlet-side housing part and / or the casing is partially closable and / or closed on the outlet side by an outlet-side housing part. For example, the outlet-side housing part can be an outlet-side housing cover or an inlet-side cover section of the casing. In this way, a cell and / or system housing can be provided that can be manufactured and assembled in a simple and cost-effective manner and also allows for easy maintenance and / or repair as well as simplified recycling.Furthermore, the outlet-side housing part can be used to control the flow of the fluid mixture, and, for example, to block the outflow of the fluid mixture from the inlet openings of the cell and / or to enable it in at least one other area of ​​the cell, for example in the outlet space and the outlet openings explained later.

[0027] In a further embodiment, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part is designed in a disc shape.

[0028] For the purposes of the present invention, a disc-shaped body or disk can be understood to be, in particular, a body having two opposing main surfaces, or a base surface and a top surface, in particular one opposite the base surface, and at least one side surface or lateral surface. The main surfaces, or the base surface and the top surface, can be, for example, flat or uneven, and optionally curved and / or arched. For example, the main surfaces, or the base surface and the top surface, can be larger, in particular many times larger, than the side surface(s), in particular in sum, or than the lateral surface.For example, a disk-shaped body can be understood as a body that is formed in the manner and / or shape of a cylinder or a prism, for example, with a lateral surface, a base, and a top surface. Its base and top surfaces can be flat or uneven, and possibly curved and / or arched. For example, its base and top surfaces can be larger, for example, many times larger, than its lateral surface area and thus also constitute the principal surfaces. For example, the radial extent of the principal surfaces, or the base and top surfaces, and / or the radius of the lateral surface can be larger, possibly many times larger, than the axial extent, thickness, and / or height of the lateral surface(s).A gas separation system can thus be designed with an inlet and an outlet in a direction essentially perpendicular to the electrodes. For example, the adsorption electrode, the counter electrode, and the separator—and optionally the bipolar plate and / or the optional inlet-side housing part and / or the optional outlet-side housing part—can each be disc-shaped.

[0029] In a further embodiment, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part is tubular, in particular with a continuous opening.

[0030] For the purposes of the present invention, a tubular body or tube can be understood to be, in particular, a hollow body with a through opening, which has an inner surface and an outer surface, especially wherein the inner surface defines the through opening. Furthermore, the hollow body can, for example, have a base and a top surface and / or a wall thickness. The inner and outer surfaces can, for example, be arranged opposite each other. The base and top surfaces can, for example, also be arranged opposite each other. The base and top surfaces can, for example, be flat or uneven, and optionally bent and / or curved and / or convex.

[0031] For example, a tubular body or tube can be understood to be a hollow body that is formed in the manner and / or shape of a hollow cylinder or a hollow prism and, in particular, has an inner lateral surface and an outer lateral surface. Especially in the case of a hollow prism, the outer lateral surface and / or the inner lateral surface can each comprise several sub-surfaces. Furthermore, the hollow cylinder or the hollow prism can, for example, have a base and a top surface and / or a wall thickness.In the case of a hollow cylinder or a hollow prism, for example, the inner lateral surface and the outer lateral surface can be opposite each other and / or the base and the top surface can be opposite each other and / or the base and the top surface can be flat or uneven, possibly bent and / or curved and / or arched.

[0032] For example, in a tubular body, the axial extent and / or the height of the inner and / or outer lateral surface can be greater than or equal to, for example by a multiple, the radius of the outer lateral surface and / or the radial extent of the base and top surfaces and / or the wall thickness.

[0033] However, in the case of a tubular body, the axial extent and / or the height of the inner and / or outer surface may be smaller than the radius of the outer surface and / or the radial extent of the base and top surfaces and / or the wall thickness. This special case can be described, for example, as a perforated disk or perforated disk-like.

[0034] A gas separation system with an inlet and an outlet in a direction essentially perpendicular to the electrodes can also be formed by the tubular design of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part. For example, the adsorption electrode and / or the counter electrode and / or the separator – and optionally the optional bipolar plate and / or the optional inlet-side housing part and / or the optional outlet-side housing part – can each be tubular. The continuous opening defined by the tubular shape can, for example, at least partially form the at least one inlet opening or the outlet opening or the mounting opening described later.

[0035] The main surfaces, or the base and top surfaces, of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part can be designed to be at least substantially parallel to each other. Optionally, the main surfaces, or the base and top surfaces, of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part can be designed to be parallel to each other.However, it is fundamentally possible and may even be advantageous to design the main surfaces, or the base surface and the top surface, only essentially parallel and / or not parallel, for example with a slope towards each other and / or with a layer thickness gradient and / or with a structure on at least one main surface, for example the bipolar plate with a structure, for example the radial ribs already explained, on a side facing the adsorption electrode.

[0036] The adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part and / or the casing, in particular their / its main surfaces or base and top surfaces, can in principle have any shape, for example symmetrical or asymmetrical, for example ovaloid or round, for example circular or oval, for example stadium-shaped or elliptical, or polygonal, for example triangular or square or hexagonal, shape, for example outer contour.

[0037] In a further embodiment, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part and / or the casing, in particular its main surfaces or base and top surface, are designed symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically.

[0038] A rotationally symmetrical design can be particularly advantageous for both setting the saturation time and for the construction and assembly of the gas separation system. For example, the adsorption electrode, the counter electrode, and the separator—and optionally the optional bipolar plate and / or the optional inlet-side housing section and / or the optional outlet-side housing section and / or the casing—can each be designed in the form of a rotationally symmetrical disk and / or a rotationally symmetrical tube.

[0039] These advantages can also be achieved in some embodiments through a mirror-symmetric and / or point-symmetric design. However, a mirror-symmetric and / or point-symmetric elongated design can be particularly advantageous in applications where diffusion plays a subordinate role, in order to achieve a small change in cross-section.

[0040] The gas separation cell may further include, in particular, an outlet for releasing the fluid mixture and / or gaseous Lewis acid released, especially from the adsorption electrode, for example in a release operation, from the gas separation cell and / or from the gas separation system.

[0041] In a further embodiment, the outlet is at least partially formed by an outlet chamber, in particular for the discharge of the fluid mixture, especially a gas mixture, particularly from the adsorption electrode, and / or for the discharge, for example separation, of gaseous Lewis acid, especially that released (again) from the adsorption electrode. The outlet chamber can be formed, for example, by an equidistant space between the outer contour of the adsorption electrode and / or the separator and / or the counter electrode and / or the bipolar plate and / or the outlet-side housing part and the inner contour of the casing.Advantageously, the outlet chamber allows fluid mixtures, particularly gas mixtures, flowing from the adsorption electrode, and / or gaseous Lewis acids (re)released from the adsorption electrode to be easily collected and discharged or separated outside the cell and adsorption electrode and / or radially outwards from the at least one inlet opening. In this embodiment, the casing can also partially serve as the outlet. This embodiment thus allows the outlet to be implemented in a particularly simple manner, for example, without the need for further through-holes in cell components.

[0042] In a further embodiment, the outlet is at least partially formed by at least one outlet opening in the form of a continuous recess in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the outlet-side housing part. Advantageously, fluid mixtures, particularly gas mixtures, flowing from the adsorption electrode and / or gaseous Lewis acid (re)released from the adsorption electrode can also be easily collected, discharged, or separated through the at least one outlet opening.

[0043] The at least one outlet opening in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the outlet-side housing part can be designed in particular in the form of a continuous recess,which extends from one main surface to the opposite main surface or from the top surface to the base surface of the adsorption electrode or the counter electrode or the separator or the bipolar plate or the outlet-side housing part through the adsorption electrode or through the counter electrode or through the separator or through the bipolar plate or through the outlet-side housing part and / or is fully enclosed and / or fully bounded, for example, by the adsorption electrode or through the counter electrode or through the separator or through the bipolar plate or through the outlet-side housing part.

[0044] The at least one inlet opening in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the inlet-side housing part can be designed in particular in the form of a continuous recess,which extends from one main surface to the opposite main surface or from the top surface to the base surface of the adsorption electrode or the counter electrode or the separator or the bipolar plate or the inlet-side housing part through the adsorption electrode or through the counter electrode or through the separator or through the bipolar plate or through the inlet-side housing part and / or is fully enclosed and / or fully bounded, for example, by the adsorption electrode or by the counter electrode or by the separator or by the bipolar plate or by the inlet-side housing part.

[0045] In a further embodiment, the at least one inlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part is formed in an inner area, for example in a central area, for example in the center, of the adsorption electrode or the counter electrode and / or the separator or the bipolar plate or the inlet-side housing part, in particular of its main surfaces or base and top surface.Designing the inlet openings in an internal area, for example in a central area, makes it advantageous to increase the cross-section for the fluid mixture towards the outside and thus reduce the flow velocity of the fluid mixture from the inside to the outside, thereby increasing the exposure time from the inside to the outside and thus adjusting, for example to standardize, the saturation time over the extent of the adsorption electrode.

[0046] The at least one inlet opening of the adsorption electrode can be located, for example, in an internal region, such as a central area, such as the center of the adsorption electrode, for example, on its main surfaces or base and top surface. The at least one inlet opening of the counter electrode can be located, for example, in an internal region, such as a central area, such as the center of the counter electrode, for example, on its main surfaces or base and top surface. The at least one inlet opening of the separator can be located, for example, in an internal region, such as a central area, such as the center of the separator, for example, on its main surfaces or base and top surface.The at least one inlet opening of the bipolar plate can be formed, for example, in an internal area, such as in a central area, such as in the center of the bipolar plate, for example, on its main surfaces or base and top surfaces. The at least one inlet opening of the inlet-side housing part can be formed, for example, in an internal area, such as in a central area, such as in the center of the inlet-side housing part, for example, on its main surfaces or base and top surfaces.

[0047] The at least one inlet opening in the interior, for example in the central area, for example the central inlet opening, can be designed, for example, at least substantially equidistant, for example equidistant, to the outer contour of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part.

[0048] In a further embodiment, the at least one outlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the outlet-side housing part is formed in an outer area, for example in a circumferential area, of the adsorption electrode or the counter electrode or the separator or the bipolar plate or the outlet-side housing part, in particular of its main surfaces or base and top surface.Designing the outlet openings in an outer area, for example in a circumferential region, advantageously allows the cross-section for the fluid mixture to be increased towards the outside, thereby reducing the flow velocity of the fluid mixture from the inside to the outside and thus increasing the exposure time from the inside to the outside, and thereby adjusting, for example standardizing, the saturation time over the extent of the adsorption electrode.

[0049] For example, the at least one outlet opening of the adsorption electrode can be located in an outer area, such as a region near the circumference of the adsorption electrode, for example, on its main surfaces or base and top surfaces. The at least one outlet opening of the counter electrode can also be located in an outer area, such as a region near the circumference of the counter electrode, for example, on its main surfaces or base and top surfaces.The at least one outlet opening of the separator can be formed, for example, in an external area, such as a circumferential region, of the separator, for example, on its main surfaces or base and top surfaces. The at least one outlet opening of the bipolar plate can be formed, for example, in an external area, such as a circumferential region, of the bipolar plate, for example, on its main surfaces or base and top surfaces. The at least one outlet opening of the outlet-side housing part can be formed, for example, in an external area, such as a circumferential region, of the outlet-side housing part, in particular on its main surfaces or base and top surfaces.

[0050] In a further embodiment, at least one mounting opening in the form of a continuous recess is provided in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the inlet-side housing part and / or in the outlet-side housing part. Through this at least one mounting opening, the adsorption electrode, the counter electrode, the separator, the bipolar plate, the inlet-side housing part and / or the outlet-side housing part can be easily mounted and aligned, for example, by attaching the mounting opening to a stacking structure, such as a rod-shaped or tubular structure, and then assembled into the gas separation cell or gas separation system.

[0051] The at least one mounting opening in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the inlet-side housing part and / or in the outlet-side housing part can be designed in particular in the form of a continuous recess,which extends from a main surface to the opposite main surface or from the top surface to the base surface of the adsorption electrode or the counter electrode or the separator or the bipolar plate or the inlet-side housing part or the outlet-side housing part through the adsorption electrode or through the counter electrode or through the separator or through the bipolar plate or through the inlet-side housing part or through the outlet-side housing part and / or is fully enclosed and / or fully bounded, for example, by the adsorption electrode or by the counter electrode or by the separator or by the bipolar plate or by the inlet-side housing part or by the outlet-side housing part.

[0052] In a further embodiment, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, inlet openings are formed in the form of continuous recesses in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the inlet-side housing part. This advantageously allows the fluid mixture, in particular a gas mixture, to be passed through the cell with a larger volume flow, for example without having to increase the cross-section of the inlet openings and / or without having to increase the cross-section of the cell or the system. Thus, the cell can advantageously be provided with a cross-section suitable for fitting into existing pipes of a system.Increasing the volume flow rate, in turn, makes it possible to increase the thickness of the adsorption electrode and / or the counter electrode, and thus the amount of available electrochemically active material, and, for example, to reduce the number of cells in a system, which can have a beneficial effect on efficiency.

[0053] In a further embodiment, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, outlet openings are formed in the form of continuous recesses in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the outlet-side housing part. This advantageously allows the volume flow through the cell to be increased with cell cross-sections suitable for equipping pipes, the thickness of the adsorption electrode and / or the counter electrode to be increased, thereby increasing the amount of available electrochemically active material, and, for example, reducing the number of cells in a system, which can have a beneficial effect on efficiency.

[0054] Optionally, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, mounting openings can be formed in the form of continuous recesses in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the inlet-side housing part and / or in the outlet-side housing part. This simplifies alignment during assembly.

[0055] In a further embodiment, the main surfaces, or the base and top surfaces, of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part are bent and / or curved and / or convex. This advantageously optimizes the contact pressure.

[0056] In principle, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part can be formed in one piece.

[0057] For example, to save on material costs during manufacturing, such as in the form of offcuts, it may be advantageous to design the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part as two or more parts.

[0058] In a further embodiment, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part (each) are formed from at least two, in particular at least three or four or five, for example at least six, or at least eight, subsections. The subsections can, in particular, form partial areas of the main surfaces or the base and top surface of the adsorption electrode or the counter electrode or the separator or the bipolar plate or the inlet-side housing part or the outlet-side housing part. The subsections and / or partial surfaces can, for example, be bounded by radii of the main surfaces or the base and top surface.Radially outward, the subsections and / or sub-areas can be bounded, for example, by the outer contour of the adsorption electrode, the counter electrode, the separator, or the bipolar plate. Radially inward, the subsections can be bounded, for example, by a central inlet opening or a central mounting opening, or they can be adjacent to each other.

[0059] In a further embodiment, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the casing and / or the inlet-side housing part and / or the outlet-side housing part and / or the at least one inlet opening and / or the outlet chamber and / or the at least one outlet opening and / or the at least one mounting opening and / or the subsections are designed and / or arranged symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically. A rotationally symmetrical design can be advantageous, for example, for setting the saturation time above the adsorption electrode and / or for mounting, for example, in a pipe of a system. These advantages can also be achieved in some embodiments by means of a mirror-symmetrical and / or point-symmetrical design.However, a mirror-symmetric and / or point-symmetric elongated design can be particularly advantageous in applications where diffusion plays a subordinate role, in order to achieve a small change in cross-section.

[0060] In a further embodiment, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the casing and / or the inlet-side housing part and / or the outlet-side housing part, in particular their / its main surfaces or base and top surfaces, have a rotationally symmetric outer contour, in particular a circular outer contour or a rotationally symmetric polygonal outer contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, and / or a mirror-symmetric and / or point-symmetric outer contour, in particular a mirror-symmetric and / or point-symmetric and / or elongated, ovaloid or polygonal outer contour, optionally also in the form of an at least partially round polygon.for example, a rounded polygon (polygon with rounded corners) and / or a polygon with rounded sides.

[0061] For example, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the casing and / or the inlet-side housing part and / or the outlet-side housing part, in particular their / its main surfaces or base and top surface, can have a circular outer contour, in particular in the form of a circle, or a rotationally symmetric polygonal outer contour, in particular in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, optionally rounded and / or rounded, or a mirror-symmetric and / or point-symmetric and / or elongated ovaloid outer contour, in particular in the form of a stadium or an ellipse, or a mirror-symmetric and / or point-symmetric and / or elongated polygonal outer contour, in particular in the form of a trapezoid or a parallelogram or a rectangle,optionally, a rounded and / or rounded rectangle, trapezoid, or parallelogram.

[0062] In particular, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the casing and / or the inlet-side housing part and / or the outlet-side housing part, in particular their / its main surfaces or base and top surface, may have an outer contour in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, or a stadium or a trapezoid or a parallelogram or a rectangle, optionally a rounded and / or rounded rectangle.

[0063] A circular outer contour can be particularly advantageous for mounting the gas separation system based thereon in pipes and / or with regard to adsorption efficiency. An outer contour in the form of an equilateral polygon, for example a hexagon or octagon, can also achieve high adsorption efficiency while simultaneously reducing material and manufacturing costs. A trapezoidal, parallelogram-shaped, or rectangular outer contour allows the advantages of the cell according to the invention to be implemented in a straight / linear cell stack. A mirror-symmetric and / or point-symmetric and / or elongated, ovaloid, or polygonal outer contour can achieve a smaller change or increase in cross-sectional area, which can be advantageous for application parameters where diffusion plays a subordinate role (large concentration gradients over short diffusion distances).By forming the cell in the shape of a stadium or an ellipse and / or in the shape of an at least partially rounded, for example rounded and / or rounded, polygon, the distance between the at least one entrance opening and the outer contour can advantageously be aligned in different, in particular radial, directions, which can have a beneficial effect on the efficiency of the cell.

[0064] In the case of a trapezoidal or triangular design, for example, the at least one inlet opening can be located adjacent to a, in particular short, (base) side of the trapezoid or a corner of the triangle and / or the at least one outlet opening can be located adjacent to a, in particular long, (base) side of the trapezoid or triangle.

[0065] In a further embodiment, the casing has a rotationally symmetrical inner contour, in particular a circular inner contour or a rotationally symmetrical polygonal inner contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, and / or a mirror-symmetrical and / or point-symmetrical inner contour, in particular a mirror-symmetrical and / or point-symmetrical and / or elongated, ovaloid or polygonal inner contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon.

[0066] For example, the casing, in particular its base and top surface, may have a circular inner contour, especially in the form of a circle, or a rotationally symmetric polygonal inner contour, especially in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, optionally rounded and / or rounded, or a mirror-symmetric and / or point-symmetric and / or elongated ovaloid inner contour, especially in the form of a stadium or an ellipse, or a mirror-symmetric and / or point-symmetric and / or elongated polygonal inner contour, especially in the form of a trapezoid or a parallelogram or a rectangle, optionally a rounded and / or rounded rectangle, trapezoid or parallelogram.

[0067] For example, the casing, in particular its base and top surface, may have an inner contour in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, or a stadium or a trapezoid or a parallelogram or a rectangle, optionally a rounded and / or rounded rectangle.

[0068] In a further embodiment, the casing has an inner contour in a shape corresponding to the outer contour of the adsorption electrode and / or the separator and / or the counter electrode and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part.

[0069] In a further embodiment, the inner contour of the casing is precisely fitted or flush with the outer contour of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part. The outlet can be achieved through the outlet openings. In this embodiment, the casing can serve as a housing for the gas separation cell or the gas separation system. In particular, the inner contour of the casing can be precisely fitted or flush with the outer contour of the inlet-side housing part.

[0070] In another embodiment, which will be explained in more detail later, the inner contour of the casing is, for example, equidistant from the outer contour of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the outlet-side housing part. The outlet space can be formed by this spacing.

[0071] In a further embodiment, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part has a central inlet opening or a central mounting opening.

[0072] In a further embodiment, the at least one inlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part has, in particular its / its main surfaces or base and top surface, a rotationally symmetric cross-section, in particular a circular cross-section or a rotationally symmetric polygonal cross-section, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a polygon with rounded sides, and / or a mirror-symmetric and / or point-symmetric cross-section, in particular a mirror-symmetric and / or point-symmetric and / or elongated, ovaloid or polygonal cross-section, optionally also in the form of an at least partially round polygon.for example, a rounded polygon (polygon with rounded corners) and / or a polygon with rounded sides.

[0073] For example, the at least one inlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part may, in particular, have its main surfaces or base and top surfaces, a circular cross-section, especially in the form of a circle, or a rotationally symmetric polygonal cross-section, especially in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, optionally rounded and / or rounded, or a mirror-symmetric and / or point-symmetric and / or elongated ovaloid cross-section, especially in the form of a stadium or an ellipse, or a mirror-symmetric and / or point-symmetric and / or elongated polygonal cross-section, especially in the form of a rectangle or a trapezoid or a parallelogram.optionally in the form of a rounded and / or circular rectangle, trapezoid or parallelogram, or in the form of a circular sector or a segment of an annulus, optionally a rounded and / or circular sector or segment of an annulus.

[0074] In particular, the at least one inlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part may have, in particular, its main surfaces or base and top surface, a cross-section in the form of a circle (circular cross-section) or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, or a stadium or a rectangle, optionally a rounded and / or rounded rectangle, or a sector of a circle or a segment of an annulus, optionally a rounded and / or rounded sector of a circle or segment of an annulus.

[0075] A circular cross-section can be particularly advantageous with regard to adsorption efficiency. A cross-section in the form of an equilateral polygon, such as an equilateral hexagon or octagon, can also achieve high adsorption efficiency while simultaneously reducing material and manufacturing costs. A mirror-symmetric and / or point-symmetric and / or elongated, ovaloid or polygonal cross-section, for example in the shape of a stadium, or a rectangle or rounded and / or rounded rectangle, can result in a smaller change or increase in cross-sectional area, which can be advantageous for application parameters where diffusion plays a subordinate role (large concentration gradients over short diffusion distances).By forming the cell in the shape of a stadium or an ellipse and / or in the shape of an at least partially rounded, for example rounded and / or rounded, polygon, the distance between the at least one entrance opening and the outer contour can advantageously be aligned in different, in particular radial, directions, which can have a beneficial effect on the efficiency of the cell.

[0076] In a further embodiment, the at least one outlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the outlet-side housing part has, in particular its main surfaces or base and top surface, a mirror-symmetric and / or point-symmetric cross-section, in particular a mirror-symmetric and / or point-symmetric and / or elongated polygonal cross-section, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a round-sided polygon.

[0077] For example, the at least one outlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the outlet-side housing part, in particular its main surfaces or base and top surface, can have a mirror-symmetric and / or point-symmetric and / or elongated, polygonal cross-section, in particular in the form of a rectangle or a trapezoid or a parallelogram, optionally a rounded and / or round-sided rectangle, trapezoid or parallelogram, or in the form of a circular segment, optionally a rounded and / or round-sided circular segment.

[0078] In particular, the at least one outlet opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the outlet-side housing part, in particular its main surfaces or base and top surface, may have a cross-section in the form of a rectangle or a trapezoid or a parallelogram, optionally a rounded and / or rounded rectangle, trapezoid or parallelogram, or a circular segment, optionally a rounded and / or rounded circular segment.

[0079] In a further embodiment, the outlet space, in particular its base and top surface, has a cross-section, in particular rotationally symmetric and / or mirror-symmetric and / or point-symmetric, especially in the form of a ring.

[0080] For example, the outlet space, in particular its base and top surface, may have a cross-section in the form of a rotationally symmetric ovaloid or polygonal ring or a mirror-symmetric and / or point-symmetric and / or elongated ovaloid or polygonal ring.

[0081] For example, the outlet space, in particular its base and top surface, can have a cross-section in the form of a circular ring or a cross-section in the form of a rotationally symmetric polygon ring, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, in particular in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, or a cross-section in the form of a mirror-symmetric and / or point-symmetric and / or elongated ovaloid ring, in particular in the form of a stadium or an ellipse, or a cross-section in the form of a mirror-symmetric and / or point-symmetric and / or elongated polygon ring.in particular in the form of a rectangle (frame) or a trapezoid or a parallelogram, optionally a rounded and / or rounded rectangle, trapezoid or parallelogram.

[0082] In a further embodiment, the at least one mounting opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part, in particular its main surfaces or base and top surface, has a rotationally symmetric cross-section, in particular a circular cross-section or a rotationally symmetric polygonal cross-section, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a round-sided polygon.

[0083] For example, the at least one mounting opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part, in particular its main surfaces or base and top surface, can have a circular cross-section, in particular in the form of a circle, or a rotationally symmetrical polygonal cross-section, in particular in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, optionally rounded and / or rounded sides.

[0084] For example, the at least one mounting opening of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part, in particular its / its main surfaces or base and top surface, may have a cross-section in the form of a circle (circular cross-section) or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or round-sided equilateral hexagon, octagon, quadrilateral (square) or triangle.

[0085] In a further embodiment, the inlet openings are symmetrical, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, to each other and / or equidistant from each other, in particular in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the inlet-side housing part, designed and / or arranged.

[0086] In the case of multiple inlet openings, the inlet openings can, for example, each have a cross-section in the form of a circular sector or a segment of a circular ring and be arranged rotationally symmetrically to each other.

[0087] Alternatively or additionally, with multiple inlet openings, it is also possible to distribute them along an axis, for example a longitudinal axis, and arrange them equidistant from each other. The inlet openings can be arranged, for example, in a mirror-symmetrical and / or point-symmetrical manner. The cross-section of the inlet opening can, for example, be circular.

[0088] In a further embodiment, the outlet openings are symmetrical to each other, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or distributed circumferentially, in particular in the adsorption electrode and / or in the counter electrode and / or in the separator and / or in the bipolar plate and / or in the outlet-side housing part, and / or arranged.

[0089] In the case of multiple outlet openings, the outlet openings can, for example, have a cross-section in the form of a circular segment or rectangle, and in particular be arranged rotationally symmetric and / or mirror-symmetric and / or point-symmetric to each other.

[0090] In a further embodiment, the main surfaces, or the base and top surfaces, of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part are bent and / or curved and / or convex. In particular, the main surfaces, or the base and top surfaces, of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part can be bent and / or curved and / or convex symmetrically, for example, rotationally symmetrically and / or mirror-symmetrically.For example, the main surfaces, or the base and top surfaces, of the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part can be formed in a rotationally symmetrical and / or mirror-symmetrical manner, and / or bent and / or curved and / or convex shape. For example, the adsorption electrode and / or the counter electrode and / or the separator and / or the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part can be formed in a hollow frustoconical or saddle-shaped shape, in particular a hollow frustoconical shape.

[0091] In a further embodiment, the sections of the adsorption electrode or the counter electrode or the separator or the bipolar plate or the inlet-side housing part and / or the outlet-side housing part are designed and / or arranged symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically.

[0092] For example, the sections of the adsorption electrode or the counter electrode or the separator or the bipolar plate or the inlet-side housing part and / or the outlet-side housing part can be arranged rotationally symmetric and / or mirror-symmetric and / or point-symmetric, in particular rotationally symmetric, and / or linearly.

[0093] For example, the sections can be trapezoidal or triangular.

[0094] For example, trapezoidal sections can form an adsorption electrode or a counter electrode or a separator or a bipolar plate or an inlet-side housing part and / or an outlet-side housing part with a hexagonal outer contour and with a hexagonal central inlet opening or mounting opening or with an octagonal outer contour and with an octagonal central inlet opening or mounting opening.

[0095] Triangular sections can be used, for example, to create numerous different polygonal outer contours with a closed center.

[0096] Furthermore, the subsections may have continuous recesses for forming inlet openings and / or outlet openings and / or assembly openings. For example, each subsection may have at least one continuous recess for forming an inlet opening and / or at least one continuous recess for forming an outlet opening and / or, if applicable, at least one continuous recess for forming an assembly opening. In the case of a trapezoidal or triangular shape, for example, the at least one continuous recess for forming the inlet opening may be adjacent to a (base) side of the trapezoid or a corner of the triangle, particularly a short side, and / or the at least one continuous recess for forming the outlet opening may be adjacent to a (base) side of the trapezoid or triangle, particularly a long side.

[0097] In a further embodiment, the adsorption electrode, the separator and the counter electrode, in particular the adsorption electrode, the separator, the counter electrode and the bipolar plate, have a similar outer contour and are in particular at least similarly sized or the same size.

[0098] In a further embodiment, at least one inlet opening in the form of a continuous recess, optionally at least two or three or four or five or six or seven or eight or nine or a plurality of inlet openings in the form of continuous recesses, is formed in the adsorption electrode and in the counter electrode and in the separator, in particular in the adsorption electrode, in the counter electrode and in the separator and in the bipolar plate and / or in the inlet-side housing part.

[0099] In a further embodiment, the adsorption electrode, the separator and the counter electrode, in particular the adsorption electrode, the separator, the counter electrode and the bipolar plate and / or the inlet-side housing part, are designed and arranged such that their inlet opening(s) merge into one another and in particular their inlet opening(s) have a similar shape and / or are congruent.

[0100] In a further embodiment, the outlet space is formed by a, for example equidistant, spacing between the outer contour of the adsorption electrode, the separator and the counter electrode and the inner contour of the casing, for example between the outer contour of the adsorption electrode, the separator, the counter electrode and the bipolar plate and the inner contour of the casing.

[0101] In another embodiment, the outlet space is also formed by a spacing, for example equidistant, between the outer contour of the outlet-side housing part and the inner contour of the casing.

[0102] In another embodiment, the outlet chamber opens into the at least one outlet opening in the outlet-side housing part.

[0103] In a further embodiment, at least one outlet opening in the form of a continuous recess, optionally at least two or three or four or five or six or seven or eight or nine or a plurality of outlet openings in the form of continuous recesses, is formed in the adsorption electrode, in the counter electrode and in the separator, in particular in the adsorption electrode, in the counter electrode and in the separator and in the bipolar plate and / or in the outlet-side housing part.

[0104] In a further embodiment, the adsorption electrode, the separator and the counter electrode, in particular the adsorption electrode, the separator, the counter electrode and the bipolar plate and / or the outlet-side housing part, are designed and arranged such that their outlet opening(s) merge into one another and in particular their outlet opening(s) have a similar shape and / or are congruent.

[0105] In a further embodiment, at least one mounting opening in the form of a continuous recess, optionally at least two or three mounting openings in the form of continuous recesses, is formed in the adsorption electrode, in the counter electrode and in the separator, in particular in the adsorption electrode, in the counter electrode and in the separator and in the bipolar plate and / or in the inlet-side housing part and / or in the outlet-side housing part.

[0106] In a further embodiment, the adsorption electrode, the separator and the counter electrode, in particular the adsorption electrode, the counter electrode and the separator and the bipolar plate and / or the inlet-side housing part and / or the outlet-side housing part, are designed and arranged such that their mounting opening(s) merge into one another and in particular their mounting opening(s) have a similar shape and / or are congruent.

[0107] The adsorption electrode can be designed to be porous. In particular, the adsorption electrode can be designed to be open-pored.

[0108] The at least one electrochemically active material of the adsorption electrode can, for example, be capable of binding and / or adsorbing the Lewis acid, such as carbon dioxide, in at least one reduced state and releasing it again through oxidation to an oxidized state. In principle, many different electrochemically active materials can be suitable for forming the adsorption electrode. For example, the at least one electrochemically active material of the adsorption electrode can comprise a quinone and / or a pyrene tetraone or pyrene tetraketone.

[0109] For example, the at least one electrochemically active material of the adsorption electrode may comprise or be at least a quinone-functionalized carbon material and / or at least a pyrene-tetraone-functionalized carbon material.

[0110] For example, the at least one electrochemically active material of the adsorption electrode can comprise or be at least one para-quinone-functionalized carbon material and / or at least one ortho-quinone-functionalized carbon material. The quinone can, in particular, be a polyquinone and / or polymerized and / or polymer-bound. For example, the at least one electrochemically active material of the adsorption electrode can comprise or be at least one poly- and / or para-quinone-functionalized carbon material, in particular at least one poly- and / or para-anthraquinone-functionalized carbon material, for example, at least one polyanthraquinone-functionalized carbon material, such as polyanthraquinone-functionalized carbon nanotubes (PAQ-CNTs).

[0111] However, it is also possible to use other electrically conductive porous materials besides carbon materials, for example porous metals, as support material and / or bonding material in the adsorption electrode.

[0112] The at least one electrochemically active material of the counter electrode can, for example, be capable of donating electrons by oxidizing to an oxidized state and accepting electrons by reducing the oxidized state, thereby enabling charge equalization between the two electrodes. In principle, many different electrochemically active materials can be suitable for forming the counter electrode.

[0113] For example, at least one electrochemically active material of the counter electrode can comprise or be ferrocene. The ferrocene can be, for example, a polyferrocene and / or polymer-bound and / or polymerized. For example, the electrochemically active material of the counter electrode can comprise or be a polymer-bound ferrocene or polyferrocene, such as polyvinyl ferrocene.

[0114] The separator can be both ion-conducting and electrically insulating. Thus, the separator can electrically isolate the adsorption electrode from the counter electrode and, at the same time, connect the adsorption electrode and the counter electrode via its ion-conducting properties.

[0115] In a further embodiment, the Lewis acid, particularly in its gaseous form, is carbon dioxide (CO2), carbonyl sulfide (COS), a sulfur oxide such as sulfur dioxide (SO2) or sulfur trioxide (SO3), a sulfuric acid ester, for example with the general chemical formula R2SO4, for example dimethyl sulfate, a nitrogen oxide such as nitrogen dioxide (NO2) or nitrogen trioxide (NO3), a phosphoric acid ester, for example with the general chemical formula: R3PO4, for example trimethyl phosphate, a sulfide, for example with the general chemical formula R2S, a carboxylic acid ester, for example with the general chemical formula: RCOOR', such as methyl formate or methyl acrylic, an aldehyde, for example with the general chemical formula: RCHO, such as formaldehyde or acrolein, a ketone, for example with the general chemical formula: R'2CO, such as acetone, an isocyanate, for example with the general chemical formula: R'NCO,such as methyl isocyanate, an isothiocyanate, for example with the general chemical formula: R'NCS, a borane, for example with the general chemical formula: BR"3, such as trimethylborane, or a borate, for example with the general chemical formula: R"3BO3, such as trimethylborate, or a combination thereof. R, in particular each R independently, can represent a hydrogen atom, an alkyl group, in particular with 1 to 12 carbon atoms, a cycloalkyl group, in particular with 3 to 12 carbon atoms, a heterocycloalkyl group, in particular with 1 to 12 carbon atoms, an aryl group, in particular with 6 to 20 carbon atoms, or a heteroaryl group, in particular with 1 to 12 carbon atoms. R', in particular each R' independently, can represent an alkyl group, in particular with 1 to 12 carbon atoms, a cycloalkyl group, in particular with 3 to 12 carbon atoms, a heterocycloalkyl group,in particular with 1 to 12 carbon atoms, an aryl group, in particular with 6 to 20 carbon atoms, or a heteroaryl group, in particular with 1 to 12 carbon atoms. R", in particular each R" independently, can represent a hydrogen atom, a halogen atom, an alkyl group, in particular with 1 to 12 carbon atoms, a cycloalkyl group, in particular with 3 to 12 carbon atoms, a heterocycloalkyl group, in particular with 1 to 12 carbon atoms, an aryl group, in particular with 6 to 20 carbon atoms, or a heteroaryl group, in particular with 1 to 12 carbon atoms.

[0116] In one embodiment of this design, the Lewis acid, in particular gaseous, is carbon dioxide (CO2), carbonyl sulfide (COS), sulfur dioxide (SO2), sulfur trioxide (SO3), nitrogen dioxide (NO2) or nitrogen trioxide (NO3) or a combination thereof.

[0117] In a preferred embodiment of this system, the Lewis acid, particularly in its gaseous form, is carbon dioxide (CO2). The gas capture cell can be used particularly advantageously for carbon dioxide capture.

[0118] In a further embodiment, the gas separation cell is designed for the separation of carbon dioxide and / or the adsorption electrode is designed for the reversible electrochemical adsorption of carbon dioxide and / or the at least one electrochemically active material of the adsorption electrode is capable in at least one reduced state of binding and / or adsorbing carbon dioxide and releasing it again by oxidation to an oxidized state and / or the at least one electrochemically active material of the adsorption electrode has carboxylic acid groups in at least one reduced, carbon dioxide-binding state.

[0119] With regard to further technical features and advantages of the gas separation cell according to the invention, explicit reference is hereby made to the explanations in connection with the gas separation system according to the invention, the electrode according to the invention, the separator according to the invention and the bipolar plate according to the invention, as well as to the figures and the description of the figures.

[0120] Another object of the invention is a gas separation system, in particular an electrochemical gas separation system, for the, in particular electrochemical, separation of a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture, in particular a gas mixture, containing the Lewis acid, which comprises at least two gas separation cells according to the invention, for example a plurality of gas separation cells according to the invention.

[0121] A bipolar plate can be arranged between two adjacent gas separation cells (each), in particular for electrically conductive connection and / or for ionic insulating separation and / or for spatial separation of adjacent gas separation cells.

[0122] The gas separation cells can be arranged in a stacked manner.

[0123] The casing, which is explained in detail in connection with the gas separation cell according to the invention and can be, for example, sleeve-shaped and / or tubular, can in particular also form at least part of a housing of the gas separation system.

[0124] The gas separation system and / or the gas separation cell according to the invention can be used, for example, to clean exhaust gas of Lewis acid, in particular carbon dioxide, especially from a ship or, for example, a locomotive or other vehicle with sufficient installation space for this purpose, or from a stationary plant, for example, a heating system and / or a fuel cell system and / or an electrolysis system and / or a generator and / or a heat engine and / or an industrial plant and / or a chemical plant, for example, in which carbon dioxide is produced as a by-product, for example, during the burning of lime in cement production (CaCO3 → CaO + CO2), and / or for carbon dioxide capture from air (DAC; English: Direct Air Capture).

[0125] The gas separation system and / or the gas separation cell according to the invention can be verified, for example, by means of visual inspection and / or data analysis.

[0126] With regard to further technical features and advantages of the gas separation system according to the invention, explicit reference is hereby made to the explanations in connection with the gas separation cell, the electrode, the separator and the bipolar plate according to the invention, as well as to the figures and the description of the figures.

[0127] Another object of the invention is an electrode, in particular an adsorption electrode and / or a counter electrode, for a gas separation cell, in particular for an electrochemical gas separation cell, for the, in particular electrochemical, separation of a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture containing the Lewis acid, in particular a gas mixture, in particular for a gas separation cell according to the invention.

[0128] In particular, at least one inlet opening is formed in the electrode, especially in the adsorption electrode and / or in the counter electrode, in particular for supplying the fluid mixture, in particular to an adsorption electrode, for example the gas separation cell and / or a gas separation system to be equipped with it, in the form of a continuous recess.

[0129] The electrode can in particular be an adsorption electrode or counter electrode designed as described in connection with the gas separation cell according to the invention.

[0130] For example, the electrode, in particular the adsorption electrode and / or the counter electrode, can be disc-shaped or tubular.

[0131] The electrode, in particular the adsorption electrode and / or the counter electrode, in particular its main surfaces or base and top surface, can, for example, have a rotationally symmetric outer contour, in particular an outer contour in the form of a circle or a rotationally symmetric polygonal outer contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, and / or a mirror-symmetric and / or point-symmetric outer contour.in particular, have a mirror-symmetric and / or point-symmetric and / or elongated ovaloid outer contour, for example in the form of a stadium or an ellipse, or a mirror-symmetric and / or point-symmetric and / or elongated polygonal outer contour, optionally also in the form of at least a partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of a trapezoid or a parallelogram or a rectangle, optionally a rounded and / or rounded rectangle, trapezoid or parallelogram.

[0132] The at least one inlet opening can, for example, have a rotationally symmetric outer contour, in particular an outer contour in the form of a circle or a rotationally symmetric polygonal outer contour, optionally also in the form of at least a partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, and / or a mirror-symmetric and / or point-symmetric outer contour, in particular a mirror-symmetric and / or point-symmetric and / or elongated ovaloid outer contour, for example in the form of a stadium or an ellipse.or have a mirror-symmetric and / or point-symmetric and / or elongated, polygonal outer contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of a trapezoid or a parallelogram or a rectangle, optionally a rounded and / or rounded rectangle, trapezoid or parallelogram, or in the form of a circular sector or a segment of an annulus, optionally a rounded and / or rounded circular sector or segment of an annulus.

[0133] The at least one inlet opening can be located, for example, in an interior area, particularly in a central area, such as in the center.

[0134] For example, the electrode, in particular the adsorption electrode and / or the counter electrode, may have a central inlet opening or a central mounting opening.

[0135] For example, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, inlet openings can be formed in the form of continuous recesses. The inlet openings can be, for example, symmetrical to each other, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or equidistant from each other.

[0136] Furthermore, the electrode, particularly the adsorption electrode and / or the counter electrode, can have, for example, at least one outlet opening, especially for the discharge of the fluid mixture or gaseous Lewis acid, particularly from an adsorption electrode, in the form of a continuous recess. This at least one outlet opening can be located in an external area, for example, in a region close to the circumference. For example, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, outlet openings can also be formed in the form of continuous recesses. The outlet openings can be, for example, symmetrical to each other, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or distributed around the circumference.For example, the outlet openings can have a cross-section in the form of a circular segment or a rectangle.

[0137] Optionally, the main surfaces, or the base and top surfaces of the electrode, in particular the adsorption electrode and / or the counter electrode, may be bent and / or curved and / or convex. Optionally, the electrode, in particular the adsorption electrode and / or the counter electrode, may be hollow frustoconical or saddle-shaped, in particular hollow conical.

[0138] It is also possible to form the electrode, in particular the adsorption electrode and / or the counter electrode, from at least two, in particular at least three, four, or five, for example, from at least six, seven, or eight subsections. For example, the subsections can be trapezoidal or triangular. Trapezoidal subsections can, for example, form a hexagonal outer contour and a hexagonal central opening, or an octagonal outer contour and an octagonal central opening. In the case of a trapezoidal or triangular configuration, for example, the at least one inlet opening can be located adjacent to a (base) side of the trapezoid or a corner of the triangle, and / or the at least one outlet opening can be located adjacent to a (base) side of the trapezoid or triangle, in particular a long side.

[0139] Furthermore, the electrode, particularly the adsorption electrode and / or the counter electrode, may have at least one mounting opening, in particular for mounting the electrode, especially the adsorption electrode or the counter electrode, in the form of a continuous recess. For example, a central mounting opening in the form of a continuous recess may be formed in the electrode, particularly the adsorption electrode and / or the counter electrode. Optionally, the electrode, particularly the adsorption electrode and / or the counter electrode, may also have at least two, or optionally three, mounting openings in the form of continuous recesses.

[0140] The electrode and / or the at least one inlet opening and / or the at least one outlet opening and / or the mounting opening and / or the main surfaces or the base surface and the top surface and / or the subsections of the electrode can be designed and / or arranged in a symmetrical manner, for example rotationally symmetric and / or mirror-symmetric and / or point-symmetric, for example rotationally symmetric.

[0141] In one embodiment, the electrode is an adsorption electrode with at least one electrochemically active material for the reversible electrochemical adsorption of the Lewis acid. For example, the at least one electrochemically active material of the adsorption electrode can comprise a quinone and / or a pyrene tetraone. The adsorption electrode can, in particular, be porous. Specifically, the adsorption electrode can be open-pored.

[0142] In another embodiment, the electrode is a counter electrode, in particular comprising at least one electrochemically active material, for example for charge balancing of an adsorption electrode. The at least one electrochemically active material can, for example, comprise or be ferrocene.

[0143] With regard to further technical features and advantages of the electrode according to the invention, explicit reference is hereby made to the explanations in connection with the gas separation cell, the gas separation system, the separator and the bipolar plate according to the invention, as well as to the figures and the description of the figures.

[0144] Another object of the invention is a separator for a gas separation cell, in particular for an electrochemical gas separation cell, for the, in particular electrochemical, separation of a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture containing the Lewis acid, in particular a gas mixture, in particular for a gas separation cell according to the invention.

[0145] In particular, the separator has at least one inlet opening, especially for supplying the fluid mixture, especially to an adsorption electrode, for example the gas separation cell and / or gas separation system to be equipped with it, in the form of a continuous recess.

[0146] The separator can be designed in particular as explained in connection with the gas separation cell according to the invention.

[0147] For example, the separator can be disc-shaped and / or tubular.

[0148] The separator, in particular its main surfaces or base and top surface, can, for example, have a rotationally symmetric outer contour, in particular an outer contour in the form of a circle or a rotationally symmetric polygonal outer contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, and / or a mirror-symmetric and / or point-symmetric outer contour, in particular a mirror-symmetric and / or point-symmetric and / or elongated ovaloid outer contour.for example, in the form of a stadium or an ellipse, or a mirror-symmetric and / or point-symmetric and / or elongated, polygonal outer contour, possibly also in the form of at least a partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of a trapezoid or a parallelogram or a rectangle, possibly a rounded and / or rounded rectangle, trapezoid or parallelogram.

[0149] The at least one inlet opening can, for example, have a rotationally symmetric outer contour, in particular an outer contour in the form of a circle or a rotationally symmetric polygonal outer contour, optionally also in the form of at least a partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, and / or a mirror-symmetric and / or point-symmetric outer contour, in particular a mirror-symmetric and / or point-symmetric and / or elongated ovaloid outer contour, for example in the form of a stadium or an ellipse.or have a mirror-symmetric and / or point-symmetric and / or elongated, polygonal outer contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of a trapezoid or a parallelogram or a rectangle, optionally a rounded and / or rounded rectangle, trapezoid or parallelogram, or in the form of a circular sector or a segment of an annulus, optionally a rounded and / or rounded circular sector or segment of an annulus.

[0150] The at least one inlet opening can be located, for example, in an interior area, particularly in a central area, such as in the center.

[0151] For example, the separator may have a central inlet opening or a central mounting opening.

[0152] For example, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, inlet openings can be formed in the form of continuous recesses. The inlet openings can be, for example, symmetrical to each other, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or equidistant from each other.

[0153] Furthermore, the separator can, for example, have at least one outlet opening, particularly for the discharge of the fluid mixture or gaseous Lewis acid, especially from an adsorption electrode, in the form of a continuous recess. This outlet opening can be located in an external area, for example, in a region close to the circumference. The outlet opening can be rotationally symmetrical and / or arranged in this way. For example, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, outlet openings can also be formed in the form of continuous recesses.The outlet openings can be symmetrical to each other, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or distributed around the circumference. For example, the outlet openings can have a cross-section in the form of a segment of a circular ring or a rectangle.

[0154] The main surfaces, specifically the base and top surfaces of the separator, may be curved, bent, and / or arched. The separator may also be truncated hollow cone-shaped or saddle-shaped, particularly truncated hollow cone-shaped.

[0155] It is also possible to form the separator from at least two, in particular at least three, four, or five, for example, at least six, seven, or eight subsections. For example, the subsections can be trapezoidal or triangular. Trapezoidal subsections can, for example, form a hexagonal outer contour and a hexagonal central opening, or an octagonal outer contour and an octagonal central opening. In the case of a trapezoidal or triangular configuration, for example, the at least one inlet opening can be located adjacent to a (base) side of the trapezoid or a corner of the triangle, and / or the at least one outlet opening can be located adjacent to a (base) side of the trapezoid or triangle, in particular a long side.

[0156] Furthermore, the separator may have at least one mounting opening, particularly for mounting the separator, in the form of a continuous recess. For example, the separator may have a central mounting opening in the form of a continuous recess. Optionally, the separator may also have at least two, or possibly three, mounting openings in the form of continuous recesses.

[0157] The separator and / or the at least one inlet opening and / or the at least one outlet opening and / or the mounting opening and / or the main surfaces or the base surface and the top surface and / or the subsections of the separator can be designed and / or arranged in a symmetrical manner, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical manner, for example rotationally symmetrical.

[0158] The separator can be made of an ion-conducting and electrically insulating material.

[0159] With regard to further technical features and advantages of the separator according to the invention, explicit reference is hereby made to the explanations in connection with the gas separation cell, the gas separation system, the electrode and the bipolar plate according to the invention, as well as to the figures and the description of the figures.

[0160] Furthermore, the invention relates to a bipolar plate, in particular for electrically conductive connection and / or for ionic insulating separation and / or for spatial separation of gas separation cells, for a gas separation cell, in particular for an electrochemical gas separation cell, for the, in particular electrochemical, separation of a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture containing the Lewis acid, in particular a gas mixture, in particular for a gas separation cell according to the invention.

[0161] In particular, at least one inlet opening, especially for supplying the fluid mixture, especially to an adsorption electrode, for example of the gas separation cell and / or gas separation system to be equipped with it, is formed in the bipolar plate in the form of a continuous recess.

[0162] The bipolar plate can be designed in particular as explained in connection with the gas separation cell according to the invention.

[0163] For example, the bipolar plate can be designed in a disc-shaped or tubular form.

[0164] The bipolar plate, in particular its main surfaces or base and top surfaces, can, for example, have a rotationally symmetric outer contour, in particular an outer contour in the form of a circle or a rotationally symmetric polygonal outer contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, and / or a mirror-symmetric and / or point-symmetric outer contour, in particular a mirror-symmetric and / or point-symmetric and / or elongated ovaloid outer contour.for example, in the form of a stadium or an ellipse, or a mirror-symmetric and / or point-symmetric and / or elongated, polygonal outer contour, possibly also in the form of at least a partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of a trapezoid or a parallelogram or a rectangle, possibly a rounded and / or rounded rectangle, trapezoid or parallelogram.

[0165] The at least one inlet opening can, for example, have a rotationally symmetric outer contour, in particular an outer contour in the form of a circle or a rotationally symmetric polygonal outer contour, optionally also in the form of at least a partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon, for example an equilateral hexagon or an equilateral octagon, optionally a rounded and / or rounded equilateral hexagon, octagon, quadrilateral (square) or triangle, and / or a mirror-symmetric and / or point-symmetric outer contour, in particular a mirror-symmetric and / or point-symmetric and / or elongated ovaloid outer contour, for example in the form of a stadium or an ellipse.or have a mirror-symmetric and / or point-symmetric and / or elongated, polygonal outer contour, optionally also in the form of an at least partially round polygon, for example a rounded polygon (polygon with rounded corners) and / or a rounded polygon, for example in the form of a trapezoid or a parallelogram or a rectangle, optionally a rounded and / or rounded rectangle, trapezoid or parallelogram, or in the form of a circular sector or a segment of an annulus, optionally a rounded and / or rounded circular sector or segment of an annulus.

[0166] The at least one inlet opening can be located, for example, in an interior area, particularly in a central area, such as in the center.

[0167] For example, the bipolar plate can have a central inlet opening or a central mounting opening.

[0168] For example, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, for example a plurality of, inlet openings can be formed in the form of continuous recesses. The inlet openings can be, for example, symmetrical to each other, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or equidistant from each other.

[0169] Furthermore, the bipolar plate can, for example, have at least one outlet opening, particularly for the discharge of the fluid mixture or gaseous Lewis acid, especially from an adsorption electrode, in the form of a continuous recess. This at least one outlet opening can be located in an outer area, for example, in a region near the circumference. Alternatively, at least two, in particular at least three or four, for example at least five or six or seven or eight, for example at least nine, or even a plurality of outlet openings, can be formed in the form of continuous recesses. The outlet openings can be symmetrical to each other, for example rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or distributed around the circumference.For example, the outlet openings can have a cross-section in the form of a circular segment or a rectangle.

[0170] Optionally, the main surfaces, or the base and top surfaces, of the bipolar plate may be curved and / or arched. Optionally, the bipolar plate may be truncated hollow cone-shaped or saddle-shaped, in particular hollow cone-shaped.

[0171] It is also possible to form the bipolar plate from at least two, in particular at least three, four, or five, for example, at least six, seven, or eight subsections. For example, the subsections can be trapezoidal or triangular. Trapezoidal subsections can, for example, form a hexagonal outer contour and a hexagonal central opening, or an octagonal outer contour and an octagonal central opening. In a trapezoidal or triangular configuration, for example, the at least one inlet opening can be located adjacent to a (base) side of the trapezoid or a corner of the triangle, and / or the at least one outlet opening can be located adjacent to a (base) side of the trapezoid or triangle, in particular a long side.

[0172] Furthermore, the bipolar plate may have at least one mounting opening, particularly for mounting the bipolar plate, in the form of a continuous recess. For example, a central mounting opening may be formed in the bipolar plate in the form of a continuous recess. Optionally, the bipolar plate may also have at least two, or possibly three, mounting openings in the form of continuous recesses.

[0173] The bipolar plate and / or the at least one inlet opening and / or the at least one outlet opening and / or the mounting opening and / or the main surfaces or the base surface and the top surface and / or the subsections of the bipolar plate can be designed and / or arranged in a symmetrical manner, for example rotationally symmetric and / or mirror-symmetric and / or point-symmetric, for example rotationally symmetric.

[0174] The bipolar plate can be made of an electrically conductive material, for example a metallic material.

[0175] With regard to further technical features and advantages of the bipolar plate according to the invention, explicit reference is hereby made to the explanations in connection with the gas separation cell, the gas separation system, the electrode and the separator according to the invention, as well as to the figures and the description of the figures. Drawings

[0176] Further advantages and advantageous embodiments of the objects according to the invention are illustrated by the drawings and explained in the following description. It should be noted that the drawings are for descriptive purposes only and are not intended to limit the invention in any way. They show Fig. 1 a cutaway, perspective, schematic representation (in the upper part in the form of an exploded view) to illustrate an embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode and the separator; Fig. 2 a schematic top view to illustrate another embodiment of the gas separation cell with a bipolar plate; Fig. 3a-d schematic representations to illustrate another embodiment of the bipolar plate and the cell; Fig. 4a-c schematic top views to illustrate further embodiments of the adsorption electrode, the counter electrode, the separator or the bipolar plate; Fig. 5 a schematic top view to illustrate an embodiment of an outlet-side housing part; Fig. 6 a perspective, schematic representation to illustrate another embodiment of the gas separation system; Fig. 7a-i schematic top views to illustrate further embodiments of the adsorption electrode, the counter electrode, the separator, the bipolar plate or an inlet-side housing part with different outer contours and cross-sections; Fig. 8a-c schematic top views to illustrate further embodiments of the adsorption electrode, the counter electrode, the separator, the bipolar plate or the inlet-side housing part with multiple inlet openings; Fig. 9a,b schematic, perspective representations to illustrate further embodiments of the adsorption electrode, the counter electrode, the separator, the bipolar plate or the inlet-side housing part with bent, curved and / or domed main surfaces; Fig. 10 a schematic top view to illustrate a further embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode, the separator or the bipolar plate with rotationally symmetric polygonal outer contour, cross-section and inner contour in the form of an equilateral hexagon, formed from rotationally symmetric trapezoidal subsections; Fig. 11 a schematic top view to illustrate a further embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode, the separator or the bipolar plate with rotationally symmetric polygonal outer contour, cross-section and inner contour in the form of an equilateral hexagon, formed from rotationally symmetric trapezoidal sections with rectangular inlet and outlet openings; Fig. 12 a schematic top view to illustrate a further embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode, the separator or the bipolar plate with a parallelogram-shaped outer contour, formed from linearly arranged trapezoidal sections with rectangular inlet openings and outlet openings; Fig. 13 a schematic top view to illustrate a further embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode, the separator or the bipolar plate with a trapezoidal outer contour and with a rectangular inlet opening and outlet opening; Fig. 14 a schematic top view to illustrate a further embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode, the separator or the bipolar plate with a rectangular outer contour and with a central rectangular inlet opening; Fig. 15 a schematic top view to illustrate a further embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode, the separator or the bipolar plate with a stadium-shaped outer contour and with a central rectangular inlet opening; and Fig. 16 a schematic top view to illustrate a further embodiment of the gas separation cell, the gas separation system, the adsorption electrode, the counter electrode, the separator or the bipolar plate with a stadium-shaped outer contour and with several circular inlet openings distributed over the longitudinal axis.

[0177] Fig. Figure 1 is a cutaway, perspective, and exploded view schematic representation to illustrate an embodiment of the gas separation cell 10 and the gas separation system 10 according to the invention for separating a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture 1, in particular a gas mixture, containing the Lewis acid, as well as the adsorption electrode 20, the counter electrode 30 and the separator 40 according to the invention.

[0178] Fig. Figure 1 shows that the gas separation cell 10 comprises an adsorption electrode 20 with at least one electrochemically active material for the reversible electrochemical adsorption of the Lewis acid, a counter electrode 30, in particular with at least one electrochemically active material for charge balancing of the adsorption electrode 20, and a separator 40 arranged between the adsorption electrode 20 and the counter electrode 30.

[0179] The upper area of Fig. 1 with the uppermost gas separation cell 10 with the uppermost adsorption electrode 20, the uppermost counter electrode 30 and the uppermost separator 40 is in Fig. 1 is shown as an exploded view in order to better illustrate the respective configurations and, for example, to demonstrate how such a cell 10 or such a system 100 can be manufactured or assembled.

[0180] In the lower area of Fig. Figure 1 shows three stacked gas adsorption cells 10, not depicted as an exploded view, each comprising an adsorption electrode 20, a separator 40, and a counter electrode 30. In the illustrated embodiment, the gas separation system 100 thus comprises more than two, in particular at least four, gas separation cells 10.

[0181] The lower part of Fig. Figure 1 shows that in the illustrated embodiment, a deposition chamber 11 is provided between the adsorption electrode 20 of one cell 10 and the counter electrode 30 of an adjacent cell 10, in particular for guiding and / or directing the fluid mixture 1 over the adsorption electrode 20. This deposition chamber 11 can be configured in various ways, as shown in the illustration. Fig. 1 ways not shown, for example by spacing out adjacent cells 10 and / or by a bipolar plate (70) explained later and / or by a porous intermediate layer.

[0182] In the Fig. In the embodiment shown in Figure 1, the gas separation cell 10 or the gas separation system 100 further comprises a sleeve-shaped and / or tubular casing 80, which circumferentially encloses the adsorption electrode 20, the separator 40, and the counter electrode 30. The casing 80 forms a, in particular lateral, part of a housing of the gas separation cell 10 and the gas separation system 100. On the inlet side, the casing 80 is partially and / or completely closed by an inlet-side housing part 80a, for example, an inlet-side housing cover. On the outlet side, the casing 80 is partially and / or completely closed by an outlet-side housing part 80b, for example, an outlet-side cover. The casing 80 has a rotationally symmetrical, in particular circular, inner and outer contour.

[0183] Fig. Figure 1 shows that the gas separation cell 10 has an inlet 50 for introducing the fluid mixture 1 into the gas separation cell 10 and / or into the gas separation system 100, and an outlet 60 for releasing the fluid mixture 1 and / or gaseous Lewis acid, particularly that released (again) from the adsorption electrode 20, from the gas separation cell 10 and / or the gas separation system 100. The different shapes of the arrows representing the fluid mixture 1 indicate that the fluid mixture 1 may have a lower Lewis acid content at the outlet 60 (dotted arrows) than during the transfer via the adsorption electrode 20 (dashed arrow) and, in particular, than at the inlet 50 (solid arrows).During the transfer of the fluid mixture 1 over the adsorption electrode 20 (dashed arrow), the content of the fluid mixture 1 of the Lewis acid may decrease, in particular, for example continuously, and / or a decreasing concentration gradient of the Lewis acid may be present in the fluid mixture 1.

[0184] In the Fig. In the embodiment shown in Figure 1, the adsorption electrode 20, the counter electrode 30, and the separator 40, as well as the inlet-side housing part 80a and the outlet-side housing part 80b, are disk-shaped. In particular, the adsorption electrode 20, the counter electrode 30, and the separator 40, as well as the inlet-side housing part 80a and the outlet-side housing part 80b, are rotationally symmetrical and each has a circular outer contour. Thus, the outer contour of the adsorption electrode 20, the separator 40, and the counter electrode 30, as well as the inlet-side housing part 80a and the outlet-side housing part 80b, corresponds to the shape of the inner contour of the casing 80.

[0185] In the Fig. In the embodiment shown in Figure 1, the inner contour of the casing 80 is formed, for example, equidistantly from the outer contour of the adsorption electrode 20, the separator 40, the counter electrode 30, and the outlet-side cover 80b, wherein this spacing forms an outlet chamber 82* through which the outlet 60 is at least partially formed. In this embodiment, the outer contour of the inlet-side housing part 80a, on the other hand, is formed to fit precisely the inner contour of the casing 80.

[0186] The entrance for 50 people is in the Fig. In the embodiment shown in Figure 1, the inlet 50 is formed at least partially by an inlet opening 21 in the form of a continuous recess in the adsorption electrode 20, by an inlet opening 41 in the form of a continuous recess in the separator 40, and by an inlet opening 31 in the form of a continuous recess in the counter electrode 30. Furthermore, the inlet 50 is formed at least partially by an inlet opening 81 in the form of a continuous recess in a region of the inlet-side housing part 80a located above the electrodes 20 and 30.

[0187] In the Fig. In the embodiment shown in Figure 1, the inlet openings 21, 31, 41, 81 of the adsorption electrode 20, the counter electrode 30, and the separator 40, as well as of the inlet-side housing part 80a, are located in an internal area, for example, in a central area, such as in the center, of the adsorption electrode 20, the counter electrode 30, the separator 40, and the inlet-side housing part 80a, respectively, in particular of their main surfaces 20*, 20**, 30*, 30**, 40*, 40**, 80*, 80** or base surface 20**, 30**, 40**, 80** and top surface 20*, 30*, 40*, 80*. The inlet openings 21, 31, 41, 81 can also be referred to as central inlet openings.The continuous openings of the inlet openings 21, 31, 41, 81 extend from a main surface or the top surface 20*, 30*, 40*, 80* to the opposite main surface or base surface 20**, 30**, 40**, 80** through the adsorption electrode 20 or through the separator 40 or through the counter electrode 30 or through the inlet-side housing part 80a, respectively, and are fully enclosed and / or bounded by them 20, 30, 40, 80. The inlet opening 21 of the adsorption electrode 20, the inlet opening 41 of the separator 40, the inlet opening 31 of the counter electrode 30, and the inlet opening 81 of the inlet-side housing part 80a have a rotationally symmetrical, in particular circular, cross-section.

[0188] Fig. Figure 1 illustrates that in the embodiment shown therein, the adsorption electrode 20, the separator 40 and the counter electrode 30 as well as the inlet-side housing part are arranged and designed, for example stacked, such that their inlet openings 21, 31, 41, 81 open into one another and in particular their inlet opening(s) 21, 31, 41, 81 have a similar shape and / or are at least substantially identical.

[0189] The in Fig. The embodiment shown in 2 differs essentially in that it is Fig. In the embodiment shown in Figure 1, a disc-shaped bipolar plate 70 is additionally provided, particularly for electrically conductive connection and / or ionic insulating separation and / or spatial separation of gas separation cells 10, for example from an adjacent gas separation cell 10. The inlet 50 is also at least partially formed by an inlet opening 71 in the form of a continuous recess in the bipolar plate 70. The inlet opening 71 of the bipolar plate 70 also has a rotationally symmetrical, in particular circular, cross-section. The bipolar plate 70 also has a rotationally symmetrical, in particular circular, outer contour.The sleeve-shaped and / or tubular casing 80 also completely encloses the bipolar plate 70, wherein the shape of the inner contour of the casing 80 corresponds to the shape of the outer contour of the bipolar plate 70 and the inner contour of the casing 80 is also, in particular equidistantly, spaced apart from the outer contour of the bipolar plate 70 and the outlet space 82* is also formed by this spacing.

[0190] The radial arrows and the inner and outer surfaces spanned by them in Fig. Figure 2 illustrates, firstly, that the volume available for the fluid mixture, which is proportional to the areas shown, increases from the inner surface in the area of ​​the inlet opening 21 / 31 / 41 / 71 outwards, in particular towards the outer surface, here in the area of ​​the outlet 60 forming a distance 80* between the outer contour of the adsorption electrode 20, the separator 40, the counter electrode 30 and the bipolar plate 70 and the inner contour of the casing 80, thereby reducing the flow velocity of the fluid mixture 1 and increasing the exposure time between the Lewis acid and the adsorption electrode 20 and thus the efficiency of the cell 10 and the system 100.

[0191] Secondly, the radial arrows illustrate Fig. 2. These parameters can be calculated using radii. For example, the length of the flow path can be calculated by the difference between the radius of the outer contour and the radius of the inlet opening 21, 31, 41, 71. Based on this length, the reduction in the Lewis acid concentration in the fluid mixture 1 can be calculated. This can be converted into a required increase in the exposure time for the same saturation time. From this, the required reduction in flow velocity and the associated increase in cross-sectional area can be calculated. In particular, the ratio of the cross-sectional areas can be proportional to the ratio of the radius of the inlet opening 21, 31, 41, 71 and the radius of the outer contour.Thus, with these parameters, in particular on the basis of the difference between the radius of the outer contour and the radius of the inlet opening 21,31,41,71 and the ratio between these two radii, an optimized adsorption electrode 20 and / or bipolar plate 70 as well as a counter electrode 30 and / or a separator 40 can be calculated for this purpose.

[0192] Fig. Figure 2 further shows that the bipolar plate 70 may optionally have a slightly larger outer diameter and / or a slightly smaller inner diameter than the adsorption electrode 20, the counter electrode 30 and the separator 40, which may be advantageous for the functions of the bipolar plate 70, for example the electrically conductive connection and / or the ionic insulating separation and / or the spatial separation.

[0193] In the Fig. 3a to 3d is a special design of a in Fig. The bipolar plate 70 shown in section 2 is depicted. Fig. 3a and Fig. 3b illustrate that the inlet opening 71 of the bipolar plate 70 is also formed in an interior area, for example in a central area, for example in the center, of the bipolar plate 70, in particular in an interior area, for example in a central area, for example in the center, of the main surfaces or of the top surface and base surface 70*,70** of the bipolar plate 70, and that the continuous recess of the inlet opening 71 of the bipolar plate 70 extends from a main surface or the top surface 70* to the opposite main surface or base surface 70** of the bipolar plate 70 through the bipolar plate 70 and is completely enclosed and / or limited by the bipolar plate 70.

[0194] In the Fig. In the embodiment shown in 3a to 3d, the bipolar plate 70 also has radially extending ribs for spacing between the adsorption electrode 20 of a cell 10 and the counter electrode 30 of an adjacent cell 10 and for forming a deposition chamber 11, in particular for guiding and / or directing the fluid mixture over the adsorption electrode 20, in particular from the inlet opening 21, 71 in the interior of the bipolar plate 70 or adsorption electrode 20, in particular radially, to the outside, for example to the outlet 60 or outlet chamber 82*.

[0195] The Fig. 3c and Fig. Figure 3d shows exploded views and illustrates that in the embodiment shown therein the adsorption electrode 20, the separator 40, the counter electrode 30 and the bipolar plate 70 are arranged, in particular stacked, to form a gas separation cell 10 or a gas separation system 100 consisting of several gas separation cells 10, such that a bipolar plate 70 is arranged between the adsorption electrode 20 of one cell 10 and the counter electrode 30 of an adjacent cell 10.

[0196] The in the Fig. The embodiments shown in 4a to 4c differ essentially from those shown in the Fig. In embodiments 1 to 3d, the outlet 60 is formed at least partially by several, for example four, outlet openings 22, 32, 42, 72 in the form of continuous recesses in the adsorption electrode 20, in the counter electrode 30, in the separator 40 or in the bipolar plate 70.

[0197] In the Fig. In the embodiments shown in Figures 4a to 4c, outlet openings 22, 32, 42, 72 of the adsorption electrode 20, the counter electrode 30, the separator 40, and the bipolar plate 70 are formed in an external area, particularly in a circumferential region, of the adsorption electrode 20, the counter electrode 30, the separator 40, and the bipolar plate 70, respectively. The continuous openings of the outlet openings 22, 32, 42, 72 can extend, in particular, from a main surface or top surface to the opposite main surface or base surface through the adsorption electrode 20, the separator 40, the counter electrode 30, and the bipolar plate 20, 30, 40, and 70, respectively, and can be completely enclosed and / or bounded by them.

[0198] Within the framework of the Fig. In the embodiments shown in 4a to 4c, the outlet openings 22, 32, 42, 72 of the adsorption electrode 20, the counter electrode 30, the separator 40 and the bipolar plate 70 respectively have a longitudinal extension in a direction parallel to the circumference and / or a circular segment-shaped cross-section.

[0199] The in the Fig. The embodiments shown in 4a to 4c in the form of outlet openings 22, 32, 42, 72 can in principle be combined with a Fig. 1 and Fig. 2. embodiment described in the form of a casing, for example in the form of a sleeve-shaped and / or tubular shape (80 in Fig. 1 and Fig. 2) and possibly also with an outlet space (82* in Fig. 1 and Fig. 2) can be combined. In particular, the [missing information] allows for [missing information] in the Fig. In embodiments shown in 4a to 4c in the form of outlet openings 22, 32, 42, 72, however, the outlet space (80*) is dispensed with and, for example, the inner contour of the casing (80) is designed flush or precisely fitted with the outer contour of the adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70.

[0200] As part of the in Fig. In the embodiment shown in Figure 4a, the adsorption electrode 20, the counter electrode 30, the separator 40 and the bipolar plate 70 respectively are analogous to those shown in the Fig. In the embodiments shown in 1 to 3d, an inlet opening 21,31,41,71 with a rotationally symmetrical, in particular circular, cross-section is located in the interior, for example in a central area, in particular in the center.

[0201] As part of the in Fig. In the embodiment shown in Figure 4b, the adsorption electrode 20, the counter electrode 30, the separator 40, and the bipolar plate 70 each have a continuous recess with a circular cross-section in their interior, for example, in a central area, particularly in the center. However, in this embodiment, this recess can serve as a mounting opening 23, 33, 43, 73, for example, for stacking the adsorption electrode 20, the counter electrode 30, the separator 40, and the bipolar plate 70, for example, on a rod-like or tubular structure that can be inserted through the mounting opening 23, 33, 43, 73. Fig. In the embodiment shown in Figure 4b, several, for example four, inlet openings 21, 31, 41, 71 are formed in the interior or in a central area of ​​the adsorption electrode 20, the counter electrode 30, the separator 40, or the bipolar plate 70. In contrast to the ones shown in the Fig. In the embodiments shown in Figures 1 to 4a, these inlet openings 21, 31, 41, 71 are not located in the center, but circumferentially around the center and / or circumferentially around the mounting opening 23, 33, 43, 73 and / or with a longitudinal extension in a direction circumferential to the mounting opening 23, 33, 43, 73 and / or with a circular annular cutout-shaped cross-section.

[0202] As part of the in Fig. In the embodiment shown in Figure 4c, several, for example four, inlet openings 21, 31, 41, 71 are formed in the interior or in a central area of ​​the adsorption electrode 20, the counter electrode 30, the separator 40, or the bipolar plate 70. In contrast to the ones shown in the Fig. In the embodiments shown in 1 to 4b, these inlet openings 21, 31, 41, 71 are not located in the center, but are arranged around the center and / or have a circular sector and / or pie-slice shaped cross-section, in particular wherein the center is closed or free from a continuous recess.

[0203] Fig. Figure 5 illustrates a further embodiment of an outlet-side housing part 80b, which has several, for example four, outlet openings 82 in the form of continuous recesses, in particular with a longitudinal extension in a direction parallel to the circumference and / or with circular segment-shaped cross-sections, for at least partial formation of the outlet 60 in a circumferential area.

[0204] Fig. Figure 6 is a perspective, schematic representation of an embodiment of a gas separation system 100 with a tubular or sleeve-shaped outer casing 80. The arrows in Fig. Figure 6 illustrates that the fluid mixture 1 can be introduced and / or flowed into the gas separation system 100 on the inlet side 50 of the gas separation system 100 through the inlet openings 21, 31, 41, 71, 81 in the interior, for example in the central area, of the adsorption electrodes 20, the counter electrodes 30, the separators 40 or the bipolar plates 70 of the cells 10, and, for example, of the inlet-side housing part 80a (not shown here). The fluid mixture 1 can then flow radially outwards and / or be directed inside the gas separation system 100 via the adsorption electrodes of the cells 10 of the gas separation system 100.The fluid mixture 1 can then flow and / or be directed through the outlet 60, for example in the form of an outlet chamber 82* and / or outlet openings 22 / 32 / 42 / 72, to the other side of the gas separation system 100 at the outer circumference of the cells 10 of the gas separation system 100 and, in particular, flow out of the gas separation system 100 at the other side. This embodiment can be integrated in a particularly simple manner into existing pipes of plants that produce fluid mixtures containing Lewis acids, in particular where the connection of special inlet and / or outlet connections between the gas separation system 100 and the plant can be avoided or even dispensed with.

[0205] The in the Fig. The embodiments shown in 7a to 7i differ from those shown in the Fig. In the embodiments shown in Figures 1 to 6, the adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70 and / or the inlet-side housing part 80a may, as an alternative to a circular outer contour, also have a rotationally symmetric polygonal outer contour, for example in the form of an equilateral triangle or a square or an equilateral hexagon, and / or, as an alternative to inlet openings with a circular cross-section, may also have inlet openings 21, 31, 41, 71, 81 with a rotationally symmetric polygonal cross-section, for example in the form of an equilateral triangle or a square or an equilateral hexagon.In one embodiment of the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side cover 80a with a rotationally symmetrical polygonal outer contour, the, for example, tubular and / or sleeve-shaped, casing (not shown in Fig. 7a-i, reference numeral 80 in . Fig. 1 and Fig. 2) in particular, have an inner contour in a corresponding shape, for example a rotationally symmetric polygonal inner contour, for example in the form of an equilateral triangle or a square or an equilateral hexagon.

[0206] As part of the in Fig. In the embodiment shown in 7a, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a cross-section in the form of an equilateral triangle and a circular outer contour.

[0207] As part of the in Fig. In the embodiment shown in 7b, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a circular cross-section and an outer contour in the form of an equilateral triangle.

[0208] As part of the in Fig. In the embodiment shown in 7c, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a cross-section in the form of an equilateral triangle and an outer contour in the form of an equilateral triangle.

[0209] As part of the in Fig. In the embodiment shown in 7d, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a square cross-section and a circular outer contour.

[0210] As part of the in Fig. In the embodiment shown in Figure 7e, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a circular cross-section and a square outer contour.

[0211] As part of the in Fig. In the embodiment shown in 7f, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a square cross-section and a square outer contour.

[0212] As part of the in Fig. In the embodiment shown in Figure 7g, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a cross-section in the form of an equilateral hexagon and a circular outer contour.

[0213] As part of the in Fig. In the embodiment shown in 7h, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a circular cross-section and an outer contour in the form of an equilateral hexagon.

[0214] As part of the in Fig. In the embodiment shown in 7i, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81 with a cross-section in the form of an equilateral hexagon and an outer contour in the form of an equilateral hexagon.

[0215] The in the Fig. The embodiments shown in Figures 8a to 8c demonstrate that the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a can also have several inlet openings 21, 31, 41, 71, 81 arranged and / or designed in a rotationally symmetrical and / or mirror-symmetrical manner relative to each other.

[0216] As part of the in Fig. In the embodiment shown in Figure 8a, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, and / or the inlet-side housing part 80a have three inlet openings 21, 31, 41, 71, 81 arranged symmetrically, in particular rotationally symmetrically, to each other in the form of a triangle. The inlet openings 21, 31, 41, 71, 81 have a circular cross-section. The adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, and / or the inlet-side housing part 80a have a circular outer contour.

[0217] As part of the in Fig. In the embodiment shown in Figure 8b, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, and / or the inlet-side housing part 80a have nine inlet openings 21, 31, 41, 71, 81 arranged symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically, relative to each other in the form of a square grid. The inlet openings 21, 31, 41, 71, 81 are distributed symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically, across the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, and / or the inlet-side housing part 80a, respectively, particularly across their main surfaces or top and bottom surfaces. The inlet openings 21, 31, 41, 71, 81 have a circular cross-section.The adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has a square outer contour.

[0218] As part of the in Fig. In the embodiment shown in Figure 8c, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, and / or the inlet-side housing part 80a have four inlet openings 21, 31, 41, 71, 81 arranged symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically, relative to each other in the form of a square. The inlet openings 21, 31, 41, 71, 81 are distributed symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically, across the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, and / or the inlet-side housing part, respectively, and in particular across their main surfaces or top and bottom surfaces. The inlet openings 21, 31, 41, 71, 81 have a square cross-section.The adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has a circular outer contour.

[0219] The in the Fig. 9a and Fig. The embodiments shown in 9b demonstrate that the main surfaces 20*, 20**, 30*, 30**, 40*, 40**, 70*, 70**, 80*, 80** or the top surface 20*, 30*, 40*, 70*, 80* and the base surface 20**, 30**, 40**, 70**, 80** of the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a can also be bent and / or curved and / or convex.

[0220] As part of the in Fig. In the embodiment shown in 9a, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a has an inlet opening 21, 31, 41, 71, 81, in particular a central one, which is formed in a plane parallel to a plane in which the outer contour or the circumference of the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 or the inlet-side housing part 80a is formed. The main surfaces 20*,20**,30*,30**,40*,40**,70*,70**,80*,80** and the top surface 20*,30*,40*,70*,80* and the base surface 20**,30**,40**,70**,80** extend in a rotationally symmetric manner between them. Fig. Figure 9a illustrates that the embodiment shown therein can also be described as a hollow truncated cone or hollow truncated cone. The adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a can be arranged in the following manner. Fig. The embodiment shown in Figure 9a can therefore also be described as having a hollow frustoconical shape. This design can potentially have an advantageous effect on the flow behavior of the fluid mixture, since it further increases the volume available for the fluid mixture radially outwards, thereby further reducing the flow velocity of the fluid mixture and further increasing the exposure time between the Lewis acid and the adsorption electrode, and thus the efficiency of cell 10 and system 100. Alternatively or additionally, the hollow frustoconical shape can be advantageous for aligning the components during assembly.

[0221] As part of the in Fig. In the embodiment shown in Figure 9b, the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70 and / or the inlet-side housing part 80a have an inlet opening 21, 31, 41, 71, 81, in particular a central one. The inlet opening 21, 31, 41, 71, 81 is formed in the same plane as a first and a second, opposing subsection of the outer contour or circumference of the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, or the inlet-side housing part 80a, respectively, wherein at least a third and a fourth, opposing subsection of the outer contour or circumference of the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, or the inlet-side housing part 80a, respectively, is displaced into another plane.The main areas 20*, 20**, 30*, 30**, 40*, 40**, 70*, 70**, 80*, 80** extend between them, as does the top area 20*, 30*, 40*, 70*, 80*, and the base area 20**, 30**, 40**, 70**, 80**. A similar arrangement. Fig. 9b shows a shaped adsorption electrode 20, counter electrode 30 or bipolar plate 70 or a similar shape as shown in Fig. The separator 40 shown in Figure 9b, or the inlet-side housing part 80a, can be formed, for example, by forming and / or shaping the adsorption electrode 20, the counter electrode 30, the separator 40, the bipolar plate 70, or the inlet-side housing part 80a on the lateral surface of a cylinder and / or described as cylindrically bent and / or curved and / or domed and / or as saddle-shaped.

[0222] The in Fig. The embodiment shown in 10 differs essentially from those shown in the Fig. In the embodiments shown in Figures 1 to 9b, the adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70 are formed in multiple parts. The adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70 (each) are formed from six subsections a, b, c, d, e, f. The six subsections a, b, c, d, e, f form symmetrical, in particular rotationally symmetrical, sub-areas of the main surfaces 20*, 30*, 40*, 70* or the top surface 20*, 30*, 40*, 70* and the base surface of the adsorption electrode 20, the counter electrode 30, the separator 40 or the bipolar plate 70, which are bounded by radii r of the main surfaces 20*, 30*, 40*, 70* or the top surface 20*, 30*, 40*, 70* and the base surface. Radially outward, the subsections a, b, c, d, e, f are bounded by the outer contour of the adsorption electrode 20, the counter electrode 30, the separator 40 or the bipolar plate 70.Radially inwards, the subsections a, b, c, d, e, f are bounded by an inlet opening 21, 31, 41, 71, particularly a central one. The subsections a, b, c, d, e, f are trapezoidal and arranged symmetrically, particularly rotationally symmetrically. Advantageously, the trapezoidal subsections a, b, c, d, e, f can be produced from strip-shaped materials, for example by stamping, thus saving material. This advantageously reduces material loss due to offcuts, as well as material and manufacturing costs.

[0223] In the Fig. In the embodiment shown in Figure 10, the inlet opening 21, 31, 41, 71, in particular the central one, has a rotationally symmetric polygonal cross-section in the form of an equilateral hexagon. The adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70 have a rotationally symmetric polygonal outer contour in the form of an equilateral hexagon. Furthermore, in the embodiment shown in Fig. In the embodiment shown in Figure 10, the casing 80, which is for example tubular and / or sleeve-shaped, has a rotationally symmetrical polygonal inner contour and an outer contour in the form of an equilateral hexagon. The inner contour in the form of an equilateral hexagon is, for example, equidistant from the outer contour of the adsorption electrode 20, the counter electrode 30, the separator 40, or the bipolar plate 70, with this spacing forming the outlet chamber 82*.

[0224] The in Fig. The embodiment shown in 11 differs essentially from those shown in the Fig. In the embodiment shown in Figure 10, each section a, b, c, d, e, f of the adsorption electrode 20, the counter electrode 30, the separator 40 or the bipolar plate 70 (additionally) has an inlet opening 21, 31, 41, 71 in a region for forming an inner region, in particular a central region, of the adsorption electrode 20, the counter electrode 30, the separator 40 or the bipolar plate 70 and an outlet opening 22, 32, 42, 72 in a region for forming an outer region, in particular a circumferential region, of the adsorption electrode 20, the counter electrode 30, the separator 40 or the bipolar plate 70. The inlet openings 21, 31, 41, 71 and the outlet openings 22, 32, 42, 72 each have an elongated extension, in particular a rectangular cross-section, and are each adjacent to one of the two base sides of the trapezoid.The inlet openings 21, 31, 41, 71 are located adjacent to the short base of the trapezoid, and the outlet openings 22, 32, 42, 72 are located adjacent to the long base of the trapezoid. This advantageously allows for an increase in the cross-sectional area. Radially inward, the sections a, b, c, d, e, f are bounded by a mounting opening 23, 33, 43, 73, particularly a central one, for example, for the stacked arrangement of the adsorption electrode 20, the counter electrode 30, the separator 40, or the bipolar plate 70, for example, on a rod-like or tubular structure that can be inserted through the mounting opening 23, 33, 43, 73, and has a rotationally symmetrical polygonal cross-section in the form of an equilateral hexagon.

[0225] The in Fig. The embodiment shown in 11 can, in principle, be used in combination with a device related to Fig. 10. The design of a casing 80, for example a sleeve-shaped and / or tubular one, can be used. In particular, the design described in the Fig. However, in the embodiment shown in Figure 11, the outlet chamber 82* is omitted, and, for example, the inner contour of the casing 80 is designed to be flush or precisely fitted with the outer contour of the adsorption electrode 20, the counter electrode 30, the separator 40, or the bipolar plate 70. The trapezoidal sections a, b, c, d, e, f in Fig. 11 can be achieved, for example, by a Fig. The arrangement shown in section 12 can be formed from strip-shaped materials, for example by die-cutting, in a material-saving manner. In this way, material loss due to offcuts, as well as material and manufacturing costs, can be advantageously reduced.

[0226] Fig. However, 12 represents in particular an independent one, from which in Fig. Figure 11 represents a further embodiment, detached from the embodiment shown, in which the adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70 (each) have a point-symmetrical, elongated, polygonal outer contour in the form of a parallelogram, which is formed from linearly arranged, trapezoidal subsections a, b, c, d. The subsections a, b, c, d each have an inlet opening 21, 31, 41, 71 and an outlet opening 22, 32, 42, 72. The inlet opening 21, 31, 41, 71 and the outlet opening 22, 32, 42, 72 have a rectangular cross-section and are each adjacent to one of the two base sides of the respective trapezoid. Here too, the inlet openings 21, 31, 41, 71 are each adjacent to the short base of the trapezoid and the outlet openings 22, 32, 42, 72 are each adjacent to the long base of the trapezoid.In this way, the advantage of an increasing cross-section can also be advantageously implemented in a straight / linear stack of cells.

[0227] Fig. Figure 13 shows a further embodiment in which the adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70 have a trapezoidal shape or a mirror-symmetrical polygonal outer contour in the form of a trapezoid, as well as an inlet opening 21, 31, 41, 71 and an outlet opening 22, 32, 42, 72. The inlet opening 21, 31, 41, 71 and the outlet opening 22, 32, 42, 72 have a mirror-symmetrical elongated polygonal cross-section in the form of a rectangle and are each adjacent to one of the two base sides of the trapezoid of the outer contour. For example, the inlet opening 21, 31, 41, 71 can be adjacent to the short base side of the trapezoid and the outlet opening 22, 32, 42, 72 adjacent to the long base side of the trapezoid. In this way, the advantage of an increasing cross-section can also be advantageously implemented in a straight / linear stack of cells.

[0228] Fig. Figure 14 shows a further embodiment in which the adsorption electrode 20, the counter electrode 30, the separator 40, and / or the bipolar plate 70 have a mirror-symmetrical, elongated polygonal outer contour in the form of a rectangle and a central inlet opening 21, 31, 41, 71 with a mirror-symmetrical, elongated polygonal cross-section in the form of a rectangle. The arrows illustrate that this results in a smaller change or increase in the cross-sectional area, for example, over the path of the sample. This variant can be particularly advantageous for application parameters where diffusion plays a subordinate role (large concentration gradients over short diffusion distances).The arrows also illustrate that the central inlet opening 21, 31, 41, 71 is formed at least substantially equidistant from the outer contour of the adsorption electrode 20, the counter electrode 30, the separator 40, and the bipolar plate 70, respectively. Only in the direction of the corners is the distance slightly increased in this embodiment. This slight change in distance can be reduced, for example, by shaping the outer contour and / or the cross-section of the inlet opening in the form of a rounded rectangle (rectangle with rounded corners) and / or, if necessary, also in the form of a rectangle with rounded sides (not shown).

[0229] Fig. Figure 15 shows a further embodiment in which the adsorption electrode 20, the counter electrode 30, the separator 40, and / or the bipolar plate 70 have a mirror-symmetrical, elongated ovaloid outer contour in the shape of a stadium and a central inlet opening 21, 31, 41, 71 with a mirror-symmetrical, elongated polygonal cross-section in the shape of a rectangle. The arrows illustrate that this also reduces the change or increase in cross-sectional area, for example, over the path of the sample. The arrows also illustrate that the central inlet opening 21, 31, 41, 71 is formed at least substantially equidistant from the outer contour of the adsorption electrode 20, the counter electrode 30, the separator 40, and / or the bipolar plate 70. The stadium-shaped outer contour minimizes the slight change in distance towards the corners compared to the distance in Figure 15. Fig. The embodiment shown in Figure 14 can be further reduced. In another embodiment not shown, the central inlet opening 21, 31, 41, 71 can also be designed with a mirror-symmetrical, elongated oval cross-section in the shape of a stadium. This ensures that the central inlet opening 21, 31, 41, 71 is equidistant from the outer contour of the adsorption electrode 20, the counter electrode 30, the separator 40, and the bipolar plate 70, respectively.

[0230] Fig.Figure 16 shows a further embodiment in which the adsorption electrode 20, the counter electrode 30, the separator 40 and / or the bipolar plate 70 have a mirror-symmetrical elongated ovaloid outer contour in the shape of a stadium and several circular inlet openings 21, 31, 41, 71 distributed along the longitudinal axis. The arrows illustrate that this also further reduces the change or increase in cross-sectional area, for example, along the path of the sample. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 2022 / 0339579 A1

[0005] Cited non-patent literature

[0000] Hatton et al. describe in the scientific publication Energy Environ. Sci., 2019, 12, 3530

[0004]

Claims

[1] Gas separation cell (10) for separating a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture (1), in particular a gas mixture, containing the Lewis acid, comprising an adsorption electrode (20) with at least one electrochemically active material for the reversible electrochemical adsorption of the Lewis acid, a counter electrode (30) and a separator (40) arranged between the adsorption electrode (20) and the counter electrode (30), wherein the gas separation cell (10) comprises an inlet (50) for introducing the fluid mixture (1) into the gas separation cell (10) and / or into a gas separation system (100) consisting of at least two cells (10), wherein the inlet (50) is at least partially formed by at least one inlet opening (21, 31, 41) in the form of a through-hole in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40) is trained. [2] Gas separation cell (10) according to claim 1, wherein the gas separation cell (10) further comprises a bipolar plate (70), wherein the inlet (50) is formed at least partially by at least one inlet opening (71) in the form of a continuous recess in the bipolar plate (70). [3] Gas separation cell (10) according to claim 1 or 2, wherein the gas separation cell (10) further comprises an inlet-side housing part (80a), wherein the inlet (50) is formed at least partially by at least one inlet opening (81) in the form of a continuous recess in a region of the inlet-side housing part (80a) arranged above the electrodes (20, 30). [4] Gas separation cell (10) according to one of claims 1 to 3, wherein the gas separation cell (10) has a particularly sleeve-shaped and / or tubular casing (80) which circumferentially encloses the adsorption electrode (20), the separator (40) and the counter electrode (30), in particular the adsorption electrode (20), the separator (40), the counter electrode (30) and the bipolar plate (70), in particular - wherein the casing (80) forms at least part of a housing (80, 80a, 80b) of the gas separation cell (10), and / or - wherein the casing (80) is partially closable and / or closed on the inlet side by the inlet-side housing part (80a), and / or - wherein the casing (80) is partially closable and / or partially closed on the outlet side by an outlet-side housing part (80b). [5] Gas separation cell (10) according to any one of claims 1 to 4, wherein the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) is designed in a disc shape, and / or wherein the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) is tubular in shape. [6] Gas separation cell (10) according to any one of claims 1 to 5, wherein the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the casing (80) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) and / or the at least one inlet opening (21, 31, 41, 71, 81) is designed symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically, and / or wherein the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the sheathing (80) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) has an outer contour in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a stadium or an ellipse or a trapezoid or a parallelogram or a rectangle, and / or wherein the casing (80) has an inner contour in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a stadium or a trapezoid or a parallelogram or a rectangle, and / or wherein the at least one inlet opening (21, 31, 41, 71, 81) of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) has a cross-section in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a rectangle or a sector of a circle or a segment of an annulus. [7] Gas separation cell (10) according to one of claims 4 to 6, wherein the casing (80) has an inner contour in a shape corresponding to the outer contour of the adsorption electrode (20) and / or the separator (40) and / or the counter electrode (30) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b). [8] Gas separation cell (10) according to any one of claims 1 to 7, wherein the gas separation cell (10) further comprises an outlet (60) for releasing the fluid mixture (1) from the gas separation cell (10) and / or from the gas separation system (100), wherein the outlet (60) is at least partially formed by an outlet space (82) which is formed by a spacing between the outer contour of the adsorption electrode (20) and / or the separator (40) and / or the counter electrode (30) and / or the bipolar plate (70) and / or the outlet-side housing part (80b) and the inner contour of the casing (80), and / or wherein the outlet (60) is formed at least partially by at least one outlet opening (22, 32, 42, 72, 82) in the form of a continuous recess in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40) and / or in the bipolar plate (70) and / or in the outlet-side housing part (80b), in particular wherein the at least one outlet opening (22, 32, 42, 72, 82) and / or the outlet space (82*) is formed and / or arranged symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically, and / or wherein the at least one outlet opening (22, 32, 42, 72, 82) of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the outlet-side housing part (80b) has a cross-section in the form of a rectangle or a trapezoid or a parallelogram or a segment of an annulus and / or wherein the outlet space (82*) has a cross-section in the form of a circular ring or a cross-section in the form of a rotationally symmetric polygon ring in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a cross-section in the form of a mirror-symmetric and / or point-symmetric and / or elongated ovaloid ring in the form of a stadium or an ellipse or a cross-section in the form of a mirror-symmetric and / or point-symmetric and / or elongated polygon ring in the form of a rectangle or a trapezoid or a parallelogram. [9] Gas separation cell (10) according to one of claims 1 to 8, wherein at least one mounting opening (23, 33, 43, 73) in the form of a continuous recess is further formed in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40) and / or in the bipolar plate (70) and / or in the inlet-side housing part (80a) and / or in the outlet-side housing part (80b), in particular wherein the at least one mounting opening (23, 33, 43, 73) is designed and / or arranged symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically, and / or wherein the at least one mounting opening (23,33,43,73) of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) has a cross-section in the form of an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a circle. [10] Gas separation cell (10) according to one of claims 1 to 9, wherein the at least one inlet opening (21, 31, 41, 71) of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) is formed in an inner region, in particular in a central region, of the adsorption electrode (20) or the counter electrode (30) or the separator (40) or the bipolar plate (70) or the inlet-side housing part (80a), and / or wherein the adsorption electrode (20), the separator (40) and the counter electrode (30), in particular the adsorption electrode (20), the separator (40), the counter electrode (30) and the bipolar plate (70) and / or the inlet-side housing part (80a), are designed and arranged such that their inlet openings (21, 31, 41, 71, 81) open into one another and in particular their inlet openings (21, 31, 41, 71, 81) have a similar shape and / or are congruent, and / or wherein the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) has a central inlet opening (21,31,41,71,80a) or a central mounting opening (23,33,43,73), and / or wherein the at least one inlet opening in the interior, in particular the central inlet opening, (21,31,41,71,81) is formed at least substantially equidistant, in particular equidistant, to the outer contour of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a). [11] Gas separation cell (10) according to one of claims 1 to 10, wherein the at least one outlet opening (22, 32, 42, 72) of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the outlet-side housing part (80b) is formed in an outer area, in particular in a circumferential area, of the adsorption electrode (20) or the counter electrode (30) or the separator (40) or the bipolar plate (70) or the outlet-side housing part (80b), and / or wherein the adsorption electrode (20), the separator (40) and the counter electrode (30), in particular the adsorption electrode (20), the separator (40), the counter electrode (30) and the bipolar plate (70) and / or the outlet-side housing part (80b), are designed and arranged such that their outlet openings (22, 32, 42, 72, 82) open into one another and in particular their outlet openings (22, 32, 42, 72, 82) have a similar shape and / or are congruent, and / or wherein the outlet chamber (82*) opens into the at least one outlet opening (82) in the outlet-side housing part (80b). [12] Gas separation cell (10) according to one of claims 1 to 11, wherein at least two, in particular at least three, inlet openings (21, 31, 41, 71, 81) are formed in the form of through-holes in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40) and / or in the bipolar plate (70) and / or in the inlet-side housing part (80a), and / or wherein at least two, in particular at least three, outlet openings (22,32,42,72,82) are formed in the form of continuous recesses in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40) and / or in the bipolar plate (70) and / or in the inlet-side housing part (80b). [13] Gas separation cell (10) according to any one of claims 1 to 12, wherein the main surfaces (20*,20**,30*,30**,40*,40**,70*,70**,80a*,80a**) or the base surface (20**,30**,40**,70**,80a**) and the top surface (20*,30*,40*,70*,80a*) of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) are bent and / or curved and / or convex, in particular wherein the main surfaces (20*, 20**, 30*, 30**, 40*, 40**, 70*, 70**, 80a*, 80a**) or the base surface (20**, 30**, 40**, 70**, 80a**) and the top surface (20*, 30*, 40*, 70*, 80a*) of the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) are symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically, curved and / or bent and / or convexly formed, in particular wherein the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) is designed in a hollow frustoconical or saddle-shaped form. [14] Gas separation cell (10) according to one of claims 1 to 13, wherein the adsorption electrode (20) and / or the counter electrode (30) and / or the separator (40) and / or the bipolar plate (70) and / or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) is formed from at least two, in particular at least three, subsections (a,b,c,d,e,f), in particular wherein the subsections (a,b,c,d,e,f) are symmetrical, in particular rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or wherein the subsections (a,b,c,d,e,f) are trapezoidal or triangular, and / or wherein the subsections (a,b,c,d,e,f) of the adsorption electrode (20) or the counter electrode (30) or the separator (40) or the bipolar plate (70) or the inlet-side housing part (80a) and / or the outlet-side housing part (80b) are arranged rotationally symmetrically or linearly. [15] Gas separation cell (10) according to any one of claims 1 to 14, wherein the inlet openings (21, 31, 41, 71, 81) are symmetrical, in particular rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, to each other and / or equidistant to each other in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40) and / or in the bipolar plate (70) and / or in the inlet-side housing part (80a), in particular wherein the inlet openings (21, 31, 41, 71, 81) have a cross-section in the form of a circular sector or a segment of a circular ring, and in particular are arranged rotationally symmetrical to each other, or wherein inlet openings (21, 31, 41, 71, 81) are distributed along an axis, in particular a longitudinal axis, and in particular are equidistant and / or mirror-symmetrical and / or point-symmetrical. are arranged in relation to each other and / or wherein the outlet openings (22, 32, 42, 72, 82) are symmetrical, in particular rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, to each other and / or circumferentially distributed in the adsorption electrode (20) and / or in the counter electrode (30) and / or in the separator (40) and / or in the bipolar plate (70) and / or in the inlet-side housing part (80b), in particular wherein the outlet openings (22, 32, 42, 72, 82) have a cross-section in the form of an annular segment or rectangle, and are in particular rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, to each other. [16] Gas separation cell (10) according to any one of claims 1 to 15, wherein the Lewis acid is carbon dioxide, carbonyl sulfide, sulfur dioxide, sulfur trioxide, a sulfuric acid ester, nitrogen dioxide, nitrogen trioxide, a phosphoric acid ester, a sulfide, a carboxylic acid ester, an aldehyde, a ketone, an isocyanate, an isothiocyanate, a borane or a borate or a combination thereof, in particular where the Lewis acid is carbon dioxide, and / or wherein the at least one electrochemically active material of the adsorption electrode (20) comprises a quinone and / or a pyrene tetraone, and / or wherein the counter electrode (30) comprises at least one electrochemically active material, wherein the electrochemically active material of the counter electrode comprises ferrocene. [17] Gas separation system (100) for separating a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture (1) containing the Lewis acid, in particular a gas mixture, comprising at least two gas separation cells (10) according to any one of claims 1 to 16, in particular wherein the casing (80) forms at least a part of a housing (80, 80a, 80b) of the gas separation system (100). [18] Electrode (20, 30), in particular adsorption electrode (20) or counter electrode (30), for a gas separation cell (10) for the separation of a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture (1) containing the Lewis acid, in particular a gas mixture, in particular for a gas separation cell (10) according to any one of claims 1 to 16, wherein at least one inlet opening (21,31) in the form of a continuous recess (1) is formed in the electrode (20,30), in particular wherein the electrode (20,30) is disc-shaped or tubular, and / or wherein the electrode (20,30) has an outer contour in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a stadium or an ellipse or a trapezoid or a parallelogram or a rectangle, and / or wherein the at least one inlet opening (21, 31) has a cross-section in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a rectangle or a sector of a circle or a segment of an annulus, and / or wherein the at least one inlet opening (21,31) is formed in an interior area, in particular in a central area, and / or wherein the electrode (20,30) has a central inlet opening (21,31) or a central mounting opening (23,33), and / or wherein at least two, in particular at least three, inlet openings (21, 31) are formed in the form of continuous recesses, and / or wherein at least one outlet opening (22, 32) is further formed in the electrode (20, 30) in the form of a continuous recess, and / or wherein the at least one outlet opening (22, 32) is formed in an outer area, in particular in a circumferential area, and / or wherein at least two, in particular at least three, outlet openings (22, 32) are formed in the form of continuous recesses, and / or wherein the main surfaces (20*,20**,30*,30**) or the base surface (20**,30**) and the top surface (20*,30*) of the electrode (20,30) are bent and / or curved and / or convex, and / or wherein the electrode (20,30) is formed from at least two, in particular at least three, subsections (a,b,c,d,e,f), in particular wherein the subsections (a,b,c,d,e,f) are trapezoidal or triangular, and / or wherein the electrode (20, 30) and / or the at least one inlet opening (21, 31) and / or the at least one outlet opening (22, 32) and / or the mounting opening (23, 33) and / or the main surfaces (20*, 20**, 30*, 30**) or the base surface (20**, 30**) and the top surface (20*, 30*) and / or the subsections (a, b, c, d, e, f) of the electrode (20, 30) are designed symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically, wherein the electrode (20, 30) is an adsorption electrode (20) with at least one electrochemically active material for the reversible electrochemical adsorption of the Lewis acid, in particular wherein the at least one electrochemically active material of the adsorption electrode (10) comprises a quinone and / or a pyrene tetraone, or wherein the electrode is a counter electrode (30) comprising at least one electrochemically active material, in particular for charge balancing of an adsorption electrode, in particular wherein the at least one electrochemically active material of the counter electrode (30) comprises or is ferrocene. [19] Separator (40) for a gas separation cell (10) for separating a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture (1) containing the Lewis acid, in particular a gas mixture, in particular for a gas separation cell (10) according to one of claims 1 to 16, wherein at least one inlet opening (41) in the form of a continuous recess is formed in the separator (40), in particular wherein the separator (40) is disc-shaped or tubular, and / or wherein the separator (40) has an outer contour in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a stadium or an ellipse or a trapezoid or a parallelogram or a rectangle, and / or wherein the at least one inlet opening (41) has a cross-section in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a rectangle or a sector of a circle or a segment of an annulus, and / or wherein the at least one inlet opening (41) is formed in an interior area, in particular in a central area, and / or wherein the separator (40) has a central inlet opening (41) or a central mounting opening (43), and / or wherein at least two, in particular at least three, inlet openings (41) are formed in the form of continuous recesses, and / or wherein the separator (40) further includes at least one outlet opening (42) in the form of a continuous recess, and / or wherein the at least one outlet opening (42) is formed in an external area, in particular in a circumferential area, and / or wherein at least two, in particular at least three, outlet openings (42) are formed in the form of continuous recesses, and / or wherein the main surfaces (40*,40**) or the base surface (40**) and the top surface (40*) of the separator (40) are bent and / or curved and / or arched, and / or wherein the separator (40) is formed from at least two, in particular at least three, subsections (a,b,c,d,e,f), in particular wherein the subsections (a,b,c,d,e,f) are trapezoidal or triangular in shape, and / or wherein the separator (40) and / or the at least one inlet opening (41) and / or the at least one outlet opening (42) and / or the mounting opening (43) and / or the main surfaces (40*,40**) or the base surface (40**) and the top surface (40*) and / or the subsections (a,b,c,d,e,f) of the separator (40) are designed symmetrically, in particular rotationally symmetrically and / or mirror-symmetrically and / or point-symmetrically, and / or wherein the separator (40) is made of an ion-conducting and electrically insulating material. [20] Bipolar plate (70) for a gas separation cell (10) for separating a gaseous Lewis acid, in particular carbon dioxide, from a fluid mixture (1) containing the Lewis acid, in particular a gas mixture, in particular for a gas separation cell (10) according to one of claims 1 to 16, wherein at least one inlet opening (71) in the form of a continuous recess is formed in the bipolar plate (70), in particular wherein the bipolar plate (70) is disc-shaped or tubular, and / or wherein the bipolar plate (70) has an outer contour in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a stadium or an ellipse or a trapezoid or a parallelogram or a rectangle, and / or wherein the at least one inlet opening (41) has a cross-section in the form of a circle or an equilateral hexagon or a square or an equilateral triangle or an equilateral octagon or a rectangle or a sector of a circle or a segment of an annulus, and / or wherein the at least one inlet opening (71) is formed in an interior area, in particular in a central area, and / or wherein the bipolar plate (70) has a central inlet opening (71) or a central mounting opening (73), and / or wherein at least two, in particular at least three, inlet openings (71) are formed in the form of continuous recesses, and / or wherein at least one outlet opening (71) in the form of a continuous recess is further formed in the bipolar plate (70), and / or wherein the at least one outlet opening (72) is formed in an external area, in particular in a circumferential area, and / or wherein at least two, in particular at least three, outlet openings (72) are formed in the form of continuous recesses, and / or wherein the main surfaces (70*,70**) or the base surface (70**) and the top surface (70*) of the bipolar plate (70) are bent and / or curved and / or arched, and / or wherein the bipolar plate (70) is formed from at least two, in particular at least three, subsections (a,b,c,d,e,f), in particular wherein the subsections (a,b,c,d,e,f) are trapezoidal or triangular in shape, and / or wherein the bipolar plate (70) and / or the at least one inlet opening (71) and / or the at least one outlet opening (72) and / or the mounting opening (73) and / or the main surfaces (70*,70**) or the base surface (70**) and the top surface (70*) and / or the subsections (a,b,c,d,e,f) of the bipolar plate (70) is symmetrical, in particular rotationally symmetrical and / or mirror-symmetrical and / or point-symmetrical, and / or wherein the bipolar plate (70) is made of an electrically conductive material, in particular a metallic material.

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