Temperature-controllable high-power carbon dioxide electrolysis device

Abstract

The invention discloses a temperature-controllable high-power carbon dioxide electrolysis device which comprises a front special plate, an anode liquid flow field plate, a membrane electrode, a cathode gas flow field plate and a rear special plate, the front surface of the anode liquid flow field plate is provided with a first cooling liquid flow field, and the back surface is provided with an anode liquid flow field; a cathode gas flow field is arranged on the front surface of the cathode gas flow field plate; a second cooling liquid flow field is arranged on the front surface of the rear special plate; the front surface of the front special plate is sequentially attached to the front surface of the anode liquid flow field plate, the anode surface of the membrane electrode, the front surface of the cathode gas flow field plate and the front surface of the rear special plate; cooling liquid passes through the first cooling liquid flow field and the second cooling liquid flow field; fluid sequentially flows through the front special plate, the anode liquid flow field plate, the membrane electrode, the cathode gas flow field plate and the rear special plate, and then sequentially flows back to the front special plate to form a U-shaped channel. A cooling liquid channel is designed in the electrolysis device, the temperature is controllable, long-time stable operation can be achieved, and the product selectivity and performance of the electrolysis device are improved.

Description

Technical Field

[0001] The invention relates to the technical field of carbon dioxide electrolysis reduction, and in particular to a temperature-controllable high-power carbon dioxide electrolysis device. Background Art

[0002] Greenhouse gases in the atmosphere, especially carbon dioxide (CO 2 ) concentration continues to rise, leading to global warming and causing adverse effects on the earth's ecosystem. In order to cope with the problem of global warming, the world is actively seeking effective measures to reduce the amount of carbon dioxide in the atmosphere. In addition to natural methods such as afforestation and increasing photosynthesis of marine algae, researchers are also exploring new technical means to efficiently absorb carbon dioxide from the atmosphere and directly reduce its content in the atmosphere. Among the many technologies for carbon dioxide conversion and utilization, carbon dioxide electrochemical reduction technology has attracted much attention due to its mild reaction conditions, environmental friendliness and sustainability. This technology converts carbon dioxide into valuable chemicals and fuels, such as carbon monoxide (CO), methane (CH 4 ) and ethanol (C 2 H 5 OH), etc., providing a new way for the resource utilization of carbon dioxide.

[0003] Early studies on the electroreduction of carbon dioxide mostly used intermittent electrolysis devices, in which carbon dioxide, as the raw material for the multiphase catalytic reaction, needs to be dissolved in the electrolyte first, and then diffuse to the electrode surface to participate in the reaction through migration. However, due to the low solubility of carbon dioxide in aqueous solution, the supply of gas reactants on the electrode surface during back feeding is greatly limited, resulting in a slow reaction rate. In contrast, gas diffusion electrodes with a porous structure can directly transport carbon dioxide from the gas phase to the catalytically active area on the electrode surface, effectively weakening the mass transfer limitations, thereby significantly improving the reaction rate and efficiency of carbon dioxide electroreduction. Compared with intermittent electrolysis devices, the reaction rate and efficiency of flow electrolysis cells equipped with gas diffusion electrodes can be improved by several orders of magnitude.

[0004] In high-power carbon dioxide electrolysis devices, a series connection is usually adopted to assemble a stack of multiple electrolysis units with a bipolar plate and a gas diffusion electrode with a porous structure. The flow channel on the bipolar plate distributes the electrolyte and gas to each electrolysis unit to achieve efficient carbon dioxide electroreduction. Unlike a single electrolysis device, the heat generated by the electrochemical reaction of a multi-section series high-power carbon dioxide electrolysis device cannot be taken away by the anode liquid in time under a higher reaction current, resulting in a rapid increase in the temperature inside the electrolysis device. As the temperature rises, the reaction path may change, the rate of the hydrogen evolution competition reaction will increase, and the intensification of the hydrogen evolution competition reaction will reduce the efficiency of the carbon dioxide reduction reaction and reduce the product selectivity; at the same time, since the cathode fluid is a gas (such as carbon dioxide), its heat dissipation capacity is usually less than that of the anode liquid, which will cause the temperature difference between the cathode and the cathode to increase further. This uneven distribution of temperature will affect the uniformity of the reaction in the electrolysis device, that is, the reaction conditions in different parts may be different, thereby affecting the efficiency and performance of the entire device.

[0005] Therefore, there is still room for improvement in the practical application of high-power carbon dioxide electrolysis devices, especially in temperature control and thermal management. Developing new electrolysis devices to achieve temperature stability and controllability during operation is of great significance for improving the efficiency of carbon dioxide electroreduction and expanding its industrial application. Summary of the invention

[0006] The purpose of the present invention is to provide a temperature-controllable high-power carbon dioxide electrolysis device, which can stabilize and control the temperature of the device during operation by adding a cooling liquid channel in the device, thereby solving the problem of decreased efficiency and product selectivity caused by temperature imbalance and improving the performance of the electrolysis device.

[0007] In order to achieve the above object, the present invention provides a temperature-controllable high-power carbon dioxide electrolysis device, comprising a front special plate, an anode liquid flow field plate, a membrane electrode, a cathode gas flow field plate, and a rear special plate;

[0008] The front side of the anode liquid flow field plate is provided with a first coolant flow field, and the back side is provided with an anode liquid flow field;

[0009] A cathode gas flow field is arranged on the front side of the cathode gas flow field plate;

[0010] A second coolant flow field is provided on the front side of the rear special plate;

[0011] The front side of the front special plate is attached to the front side of the anode liquid flow field plate; the back side of the anode liquid flow field plate is attached to the anode side of the membrane electrode; the cathode side of the membrane electrode is attached to the front side of the cathode gas flow field plate; the back side of the cathode gas flow field plate is attached to the front side of the rear special plate;

[0012] The first coolant flow field and the second coolant flow field are for coolant to pass through; the anode liquid, cathode gas and coolant flow in from the back side of the front special plate, pass through the anode liquid flow field plate, membrane electrode, cathode gas flow field plate in sequence, flow out from the front side of the rear special plate, and then flow back to the front special plate in sequence to form a U-shaped channel.

[0013] Optionally, the first coolant flow field, the second coolant flow field, and the anode liquid flow field are parallel flow fields; and the cathode gas flow field is one or more of a serpentine flow field, a parallel flow field, and an interdigitated flow field.

[0014] Optionally, the anode liquid flow field plate, membrane electrode, and cathode gas flow field plate are alternately stacked in sequence to form multiple electrolysis units connected in series, and the number of the electrolysis units is 2-50.

[0015] Optionally, it also includes a front end plate, a front insulating plate, a front current collecting plate, a rear current collecting plate, a rear insulating plate, and a rear end plate; the front side of the front end plate is attached to the front side of the front insulating plate, the back side of the front insulating plate is attached to the front side of the front current collecting plate, the back side of the front current collecting plate is attached to the back side of the front special plate, the back side of the rear special plate is attached to the front side of the rear current collecting plate, the back side of the rear current collecting plate is attached to the front side of the rear insulating plate, and the back side of the rear insulating plate is attached to the front side of the rear end plate.

[0016] Optionally, sealing grooves are provided on the back side of the front insulating plate, the back side of the front special plate, the front and back sides of the anode liquid flow field plate, the front side of the cathode gas flow field plate, and the front side of the rear special plate to seal the fluid channel.

[0017] Optionally, the front end plate is provided with cathode gas inlet and outlet holes, anode liquid inlet and outlet holes and coolant inlet and outlet holes; the cathode gas inlet and outlet holes are diagonally symmetrically distributed with respect to the center of the front end plate, with a diameter of 10mm-12mm, the anode liquid inlet and outlet holes are diagonally symmetrically distributed with respect to the center of the front end plate, with a diameter of 12mm-14mm, and the coolant inlet and outlet holes are diagonally symmetrically distributed with respect to the center of the front end plate, with a diameter of 12mm-14mm.

[0018] Optionally, the front insulating plate, front special plate, anode liquid flow field plate and cathode gas flow field plate are provided with cathode gas inlet and outlet, anode liquid inlet and outlet, and cooling liquid inlet and outlet corresponding to the positions of the cathode gas inlet and outlet holes, anode liquid inlet and outlet holes, and cooling liquid inlet and outlet holes, respectively.

[0019] Optionally, the front side of the anode liquid flow field plate is also provided with a back-facing air inlet comb located at the bottom of the cathode gas inlet and outlet, and a back-facing liquid inlet comb located at the bottom of the anode liquid inlet and outlet, the bottom small holes of the back-facing air inlet comb are a non-through structure, and the bottom small holes of the back-facing liquid inlet comb are a through structure; the back side of the cathode gas flow field plate is also provided with a back-facing air inlet located below the cathode gas inlet and above the outlet.

[0020] Optionally, the front side of the front insulating plate is also provided with a cathode gas redistribution groove, an anode liquid redistribution groove, and a coolant redistribution groove, which respectively correspond to the positions of the cathode gas inlet and outlet holes, the anode liquid inlet and outlet holes, and the coolant inlet and outlet holes; the front side of the rear special plate is also provided with a cathode gas bottom groove, an anode liquid bottom groove, and a coolant bottom groove, which respectively correspond to the positions of the cathode gas inlet and outlet holes, the anode liquid inlet and outlet holes, and the coolant inlet and outlet holes.

[0021] Optionally, the front side of the rear special plate is also provided with a back-facing air inlet comb located at the bottom of the cathode gas bottom tank, and a back-facing liquid inlet comb located at the bottom of the anode liquid bottom tank.

[0022] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0023] 1) The present invention designs a coolant channel in a high-power carbon dioxide electrolysis device. By adjusting the flow rate and temperature of the coolant introduced, heat transfer between components can be achieved, thereby cooling or heating the anode and cathode fluids, improving the uniformity of heat distribution in the electrolysis device, making the temperature controllable during operation and able to operate stably for a long time, thereby improving the product selectivity and performance of the electrolysis device.

[0024] 2) Furthermore, the use of a back-to-back air / liquid inlet structure can enhance the uniformity of the fluid, shorten the distance the fluid flows, and improve mass transfer efficiency.

[0025] 3) Furthermore, the sealing grooves can achieve high sealing of the fluids in the electrolysis device, thus avoiding performance degradation or failure caused by mutual leakage of the fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a temperature-controllable high-power carbon dioxide electrolysis device of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the front and back sides of the front end plate and the front insulating plate of the present invention; wherein a is the front end plate and b is the front insulating plate.

[0028] Figure 3It is a structural schematic diagram of the front and back sides of the front special plate and the rear special plate of the present invention; wherein c is the front special plate and d is the rear special plate.

[0029] Figure 4 It is a schematic structural diagram of the front and back sides of the cathode gas flow field plate and the anode liquid flow field plate of the present invention; wherein, e is the anode liquid flow field plate, and f is the cathode gas flow field plate.

[0030] Figure 5 It is a columnar distribution diagram of product selectivity of the temperature-controllable high-power carbon dioxide electrolysis device of the present invention under temperature-controlled and non-temperature-controlled conditions; wherein g is under non-temperature-controlled conditions, and h is under temperature-controlled conditions.

[0031] Figure ID:

[0032] Front end plate 100, front insulating plate 200, front current collecting plate 300, front special plate 400, anode liquid flow field plate 500, membrane electrode 600, cathode gas flow field plate 700, rear special plate 800, rear current collecting plate 900, rear insulating plate 1000, rear end plate 1100, cathode gas inlet and outlet holes 120, anode liquid inlet and outlet holes 110, coolant inlet and outlet holes 130, cathode gas redistribution groove 220, anode liquid redistribution groove 210, coolant redistribution groove 230, sealing groove 240, cathode gas inlet and outlet 420, anode liquid inlet and outlet 410, coolant inlet and outlet 430, sealing groove 440, cathode gas Inlet and outlet 520, anode liquid inlet and outlet 510, cooling liquid inlet and outlet 530, sealing groove 540, back-facing air inlet tooth comb 521, back-facing liquid inlet tooth comb 511, bottom small hole 5111, anode liquid flow field 550, first cooling liquid flow field 560, cathode gas inlet and outlet 720, anode liquid inlet and outlet 710, cooling liquid inlet and outlet 730, sealing groove 740, back-facing air inlet 721, cathode gas flow field 750, cathode gas bottom groove 810, anode liquid bottom groove 820, cooling liquid bottom groove 830, sealing groove 840, back-facing air inlet tooth comb 811, back-facing liquid inlet tooth comb 821, second cooling liquid flow field 860. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] As described in the background technology, the heat generated by the electrochemical reaction in a high-power carbon dioxide electrolysis device cannot be taken away by the anode liquid in time, and the temperature inside the device will rise rapidly. The temperature increase causes the reaction path to change, and the hydrogen evolution competition reaction intensifies, thereby reducing the efficiency of the carbon dioxide reduction reaction and reducing the product selectivity; at the same time, because the heat dissipation capacity of the cathode gas is usually less than that of the anode liquid, the temperature difference between the cathode and the cathode will further increase. The uneven distribution of temperature will affect the uniformity of the reaction in the electrolysis device, resulting in reduced performance of the entire device.

[0036] In order to solve the above problems, the present invention designs a temperature-controllable high-power carbon dioxide electrolysis device, and designs a coolant channel in the electrolysis device. By adjusting the flow rate and temperature of the coolant introduced, heat transfer between components can be achieved, thereby cooling or heating the anode and cathode fluids, improving the uniformity of heat distribution in the electrolysis device, making the temperature controllable during operation and able to operate stably for a long time, thereby improving the product selectivity and performance of the electrolysis device.

[0037] like Figure 1 As shown, the temperature-controllable high-power carbon dioxide electrolysis device includes a front plate 100, a front insulating plate 200, a front current collecting plate 300, a front special plate 400, an anode liquid flow field plate 500, a membrane electrode 600, a cathode gas flow field plate 700, a rear special plate 800, a rear current collecting plate 900, a rear insulating plate 1000 and a rear plate 1100 arranged in sequence. Circular mounting holes with a diameter of 6mm-8mm are correspondingly opened at the edge positions of the above components. There can be multiple circular mounting holes on each component, which are arranged at intervals around the edge. In a preferred embodiment, 8 circular mounting holes are arranged at intervals around the edge (see Figure 2 In a, 1-8), the fastening screws can be used to pass through the corresponding 8 circular mounting holes on each component in sequence to achieve the connection and fixation of each component.

[0038] In this embodiment, the anode liquid flow field plate 500, the membrane electrode 600 and the cathode gas flow field plate 700 are alternately stacked in sequence to form a plurality of electrolytic units connected in series, and the number of the electrolytic units is 2-50.

[0039] like Figure 2As shown in a in FIG. 1 , in addition to the mounting holes, the front end plate 100 is also provided with a plurality of holes penetrating the front and back sides thereof, which are cathode gas inlet and outlet holes 120, anode liquid inlet and outlet holes 110, and coolant inlet and outlet holes 130. The diameter of the cathode gas inlet and outlet holes 120 is 10 mm to 12 mm, and the diameter of the anode liquid inlet and outlet holes 110 and the coolant inlet and outlet holes 130 is 12 mm to 14 mm. Among them, the cathode gas inlet and outlet holes 120 are diagonally symmetrically distributed with respect to the center of the front end plate 100, the anode liquid inlet and outlet holes 110 are diagonally symmetrically distributed with respect to the center of the front end plate 100, and the coolant inlet and outlet holes 130 are diagonally symmetrically distributed with respect to the center of the front end plate 100, and the coolant inlet hole 130 is located between the anode liquid inlet hole 110 and the cathode gas outlet hole 120, and the coolant outlet hole 130 is located between the anode liquid outlet hole 110 and the cathode gas inlet hole 120.

[0040] like Figure 2 As shown in b, the cathode gas redistribution groove 220, the anode liquid redistribution groove 210 and the coolant redistribution groove 230 are respectively arranged on the front side of the front insulating plate 200 at positions corresponding to the cathode gas inlet and outlet holes 120, the anode liquid inlet and outlet holes 110 and the coolant inlet and outlet holes 130. Among them, the cathode gas redistribution groove 220, the anode liquid redistribution groove 210 and the coolant redistribution groove 230 are all isosceles triangles, with a base length of 20mm-30mm and two sides of 15mm-20mm. In order to play the role of insulation and heat insulation and fluid secondary distribution, the depth of each redistribution groove is set to 40%-60% of the thickness of the front insulating plate 200. As an example, the thickness of the front insulating plate 200 can be set to 8mm-12mm, and the depth of each redistribution groove can be set to 4mm-6mm. Furthermore, the bottom edge of each redistribution groove is also provided with a plurality of fluid inlets and outlets penetrating the front insulating plate 200, with a length of 20mm-30mm and a width of 3mm-8mm. A sealing groove 240 is also provided on the back of the front insulating plate 200. The sealing groove 240 is in a long strip shape and seals each fluid inlet and outlet respectively, and its function is to ensure the sealing of the fluid channel between the front insulating plate 200 and the front current collecting plate 300. In this embodiment, the front surface of the front insulating plate 200 is in contact with the front surface of the front end plate 100, and the fluid flows in from the inlet on the back of the front end plate 100 and flows out from the back of the front insulating plate 200.

[0041] The front current collecting plate 300 is provided with a plurality of fluid inlets and outlets that pass through the front and back sides thereof, and the sizes and positions thereof are consistent with the fluid inlets and outlets on the front insulating plate 200. A current collecting ear that protrudes outward is provided in the middle of one side of the front current collecting plate 300, and the length and width thereof are both 1 / 3 of the length of the side of the front current collecting plate 300. The current collecting ear usually has a high electrical conductivity and is responsible for collecting and conducting current to ensure that the current can be effectively transferred from the electrode to the external circuit. In this embodiment, the front side of the front current collecting plate 300 is in contact with the back side of the front insulating plate 200, and after the fluid flows out from the back side of the front insulating plate 200, it flows in from the front side of the front current collecting plate 300 and flows out from the back side.

[0042] like Figure 3 As shown in c, the front special plate 400 is provided with cathode gas inlet and outlet 420, anode liquid inlet and outlet 410 and coolant inlet and outlet 430 that pass through the front and back sides thereof, and their sizes and positions are respectively consistent with the fluid inlets and outlets on the front current collecting plate 300. A sealing groove 440 is also provided on the back side of the front special plate 400, which is in the shape of a long strip and seals the cathode gas inlet and outlet 420, anode liquid inlet and outlet 410 and coolant inlet and outlet 430 respectively, and its function is to ensure the sealing of the fluid channel between the front current collecting plate 300 and the front special plate 400. In this embodiment, the back side of the front special plate 400 is in contact with the back side of the front current collecting plate 300, and after the fluid flows out from the back side of the front current collecting plate 300, it flows into the back side of the front special plate 400 and flows out from the front side.

[0043] like Figure 3As shown in d, the front of the rear special plate 800 is provided with a cathode gas bottom groove 810, an anode liquid bottom groove 820 and a coolant bottom groove 830, all of which are grooves that do not penetrate the rear special plate 800. The bottoms of the cathode gas bottom groove 810 and the anode liquid bottom groove 820 are respectively provided with a back-to-air intake comb 811 and a back-to-liquid intake comb 821, which function is to enhance the uniformity of the fluid. The front of the rear special plate 800 is also provided with a second coolant flow field 860, which is a parallel flow field and is connected to the coolant bottom groove 830 respectively. The front of the rear special plate 800 is also provided with a sealing groove 840, which is a long strip structure and is arranged in three parts, one part seals the cathode gas bottom groove 810, one part seals the anode liquid bottom groove 820, and one part seals the coolant bottom groove 830 and the second coolant flow field 860. This sealing method can separate the cathode gas bottom groove 810, the anode liquid bottom groove 820 and the coolant bottom groove 830, ensuring that the coolant only flows in the second coolant flow field 860 without invading other areas. Due to the existence of the sealing groove 840, the fluid cannot flow in the second coolant flow field 860 after flowing in from the groove inlet, and can only flow out from the back air inlet tooth comb 811 and the back liquid inlet tooth comb 821, shortening the distance the fluid flows, improving the mass transfer efficiency, and then flowing back into the cathode gas flow field plate 700 and the anode liquid flow field plate 500. The back of the rear special plate 800 is a smooth flat plate without a special structure.

[0044] like Figure 4As shown in Figure e, the anode liquid flow field plate 500 is provided with cathode gas inlet and outlet 520, anode liquid inlet and outlet 510, cooling liquid inlet and outlet 530 and sealing groove 540 that pass through the front and back sides thereof. The sealing groove 540 is provided on the front side of the anode liquid flow field plate 500, and is a long strip structure, and is provided in three parts, one part seals the cathode gas inlet and outlet 520, one part seals the anode liquid inlet and outlet 510, and one part seals the cooling liquid inlet and outlet 530, which isolates the cathode and cathode fluids from the cooling liquid to prevent the fluids from leaking to each other or leaking to the outside inside the electrolysis device. The front side of the anode liquid flow field plate 500 is also provided with a first cooling liquid flow field 560, which is a parallel flow field and is connected to the cooling liquid inlet and outlet 530 respectively, and has the same structure as the second cooling liquid flow field 860. The bottoms of the cathode gas inlet and outlet 520 and the anode liquid inlet and outlet 510 are provided with back-to-air inlet tooth combs 521 and back-to-liquid inlet tooth combs 511, respectively, to enhance the uniformity of the fluid. The bottom small hole of the back-facing air inlet comb 521 is a non-through structure, which does not penetrate the anode liquid flow field plate 500, and the bottom small hole 5111 of the back-facing liquid inlet comb 511 is a through structure, which penetrates the anode liquid flow field plate 500 and connects the anode liquid flow field 550 on the back of the anode liquid flow field plate 500. The anode liquid flow field 550 is a parallel flow field, the width of the flow channel is 0.8mm-1.2mm, the depth is 0.8mm-1.2mm, and the width of the flow channel ridge is 0.4mm-0.6mm. The front of the front special plate 400 is attached to the front of the anode liquid flow field plate 500, and the first coolant flow field 560 on the front of the anode liquid flow field plate 500 can be used for the coolant to pass through. After the coolant flows out from the coolant outlet 530, it passes through the membrane electrode 600 and the cathode gas flow field plate 700 and flows into the coolant bottom tank 830 of the rear special plate 800. In this embodiment, the back side of the anode liquid flow field plate 500 is in contact with the anode electrode surface of the membrane electrode 600 (hereinafter referred to as the anode surface). After the fluid flows out from the front side of the front special plate 400, it flows in from the front side of the anode liquid flow field plate 500, flows out from the back side, then flows in from the anode surface of the membrane electrode 600, and flows out from the cathode gas diffusion electrode surface (hereinafter referred to as the cathode surface).

[0045] The membrane electrode 600 is composed of an anode electrode, a cathode gas diffusion electrode and an ion exchange membrane. The ion exchange membrane is located between the anode electrode and the cathode gas diffusion electrode to ensure that the reaction gas can react on the electrode surface while maintaining electrical insulation and ion conduction between the electrodes. In some embodiments, the support material of the anode electrode is titanium felt, and the anode catalyst is iridium oxide; the support material of the cathode gas diffusion electrode is porous carbon, and the cathode catalyst includes but is not limited to metals and alloys such as tin, silver, copper, gold, bismuth, zinc, and lead; the ion exchange membrane is an anion exchange membrane or a cation exchange membrane. As an example, the cation exchange membrane can be Nafion 115 membrane, Nafion 117 membrane, Nafion XL membrane, and Nafion N324 membrane produced by DuPont. In this embodiment, the cathode surface of the membrane electrode 600 is attached to the front surface of the cathode gas flow field plate 700. After the fluid flows out from the cathode surface of the membrane electrode 600, it flows into the front surface of the cathode gas flow field plate 700 and flows out from the back surface.

[0046] like Figure 4 As shown in f, the cathode gas flow field plate 700 is provided with a cathode gas inlet and outlet 720, an anode liquid inlet and outlet 710, and a coolant inlet and outlet 730 that pass through the front and back sides thereof. The front side of the cathode gas flow field plate 700 is also provided with a sealing groove 740 and a cathode gas flow field 750. The sealing groove 740 is a long strip structure and is provided with three parts, one part seals the cathode gas inlet and outlet 720, one part seals the anode liquid inlet and outlet 710, and one part seals the coolant inlet and outlet 730, which plays the role of separating the cathode and cathode fluids and the coolant, and preventing the fluids from leaking to each other or leaking to the outside inside the electrolysis device. At the same time, a back-facing air inlet 721 is provided below the cathode gas inlet 720 on the back side of the cathode gas flow field plate 700 and above the cathode gas outlet 720. Due to the existence of the sealing groove 740, the cathode gas can only pass through the back-facing air inlet 721 and enter the cathode gas flow field 750 on the front side from the back side of the cathode gas flow field plate 700. In some embodiments, the cathode gas flow field 750 is one or more of a serpentine flow field, a parallel flow field, and an interdigitated flow field, the width of the flow channel is 0.8mm-1.2mm, the depth is 0.4mm-0.6mm, and the width of the flow channel ridge is 0.4mm-0.6mm. The back of the cathode gas flow field plate 700 is in contact with the front of the rear special plate 800, and the second coolant flow field 860 on the front of the rear special plate 800 can allow the coolant to pass through. After the coolant flows out from the coolant bottom groove 830, it flows back to the coolant outlet of the front end plate 100 to form a U-shaped channel. After the fluid flows out from the back of the cathode gas flow field plate 700, it flows in from the front of the rear special plate 800, flows out from the back, and then flows back to the fluid outlet of the front end plate 100 to form a U-shaped channel.

[0047] In this embodiment, the sizes of the cooling liquid inlet and outlet 130, 430, 530, 730 and the anode liquid inlet and outlet 110, 410, 510, 710 are the same and are twice the size of the cathode gas inlet and outlet 120, 420, 520, 720.

[0048] It can be understood that, in this embodiment, after the coolant enters from the coolant inlet hole 130 of the front end plate 100, it is secondary distributed in the coolant redistribution groove 230 of the front insulating plate 200, passes through the fluid inlet of the front current collecting plate 300, the coolant inlet 430 of the front special plate 400 to reach the coolant inlet 530 of the anode liquid flow field plate 500, flows through the first coolant flow field 560, and is discharged from the coolant outlet 530 through the membrane electrode 600, the coolant inlet 730 of the cathode gas flow field plate 700, and the coolant bottom groove 83 of the rear special plate 800. 0, flows through the second coolant flow field 860 and then flows out from the coolant bottom tank 830, and then flows back through the coolant outlet 730 of the cathode gas flow field plate 700, the membrane electrode 600, the coolant outlet 530 of the anode liquid flow field plate 500, the first coolant flow field 560, the coolant inlet 530 of the anode liquid flow field plate 500, the coolant outlet 430 of the front special plate 400, the fluid outlet of the front current collecting plate 300, the coolant redistribution groove 230 of the front insulating plate 200, and the coolant outlet 130 of the front end plate 100, forming a U-shaped channel. By adjusting the flow rate and temperature of the coolant introduced, heat transfer between the components can be achieved, thereby cooling or heating the anode and cathode fluids, improving the uniformity of heat distribution in the electrolysis device, making it temperature controllable during operation and able to operate stably for a long time.

[0049] The rear current collecting plate 900 is the same as the front current collecting plate 300, but no fluid inlet or outlet is provided on the rear current collecting plate 900. In some embodiments, the material of the front current collecting plate 300 and the rear current collecting plate 900 is a metal with a coating, the coating is any one of gold, silver, and tin, and the metal is any one of titanium, copper, and aluminum. In this embodiment, the front surface of the rear current collecting plate 900 is bonded to the back surface of the rear special plate 800.

[0050] The rear insulating plate 1000 is the same as the front insulating plate 200, but the rear insulating plate 1000 is a smooth flat plate without any special structure. In some embodiments, the material of the front insulating plate 200 and the rear insulating plate 1000 is any one of polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), and polyetheretherketone (PEEK). In this embodiment, the front surface of the rear insulating plate 1000 is bonded to the back surface of the rear current collecting plate 900.

[0051] The rear plate 1100 is the same as the front plate 100, but the rear plate 1100 is a smooth flat plate without any special structure. In some embodiments, the material of the front plate 100 and the rear plate 1100 is any one of 314L stainless steel, polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), and polyetheretherketone (PEEK). In this embodiment, the front side of the rear plate 1100 is bonded to the back side of the rear insulation plate 1000.

[0052] In some embodiments, the front special plate 400, the anode liquid flow field plate 500, the cathode gas flow field plate 700, and the rear special plate 800 are made of the same material, which is one or more of aluminum alloy, stainless steel, and titanium.

[0053] The assembly method and operation process of the temperature-controllable high-power carbon dioxide electrolysis device of the present invention are described in detail below in conjunction with the embodiments.

[0054] Example

[0055] In this embodiment, the anode liquid flow field plate 500, the membrane electrode 600 and the cathode gas flow field plate 700 are stacked in sequence to form an electrolysis unit. Figure 1 There are three electrolysis units. In the electrolysis unit, the back side of the anode liquid flow field plate 500 is attached to the anode side of the membrane electrode 600, and the cathode side of the membrane electrode 600 is attached to the front side of the cathode gas flow field plate 700. Figure 1 As shown, the front side of the front plate 100 is attached to the front side of the front insulating plate 200, the back side of the front insulating plate 200 is attached to the front side of the front current collecting plate 300, the back side of the front current collecting plate 300 is attached to the back side of the front special plate 400, the front side of the front special plate 400 is attached to the front side of the anode liquid flow field plate 500, the back side of the anode liquid flow field plate 500 is attached to the anode side of the membrane electrode 600, the cathode side of the membrane electrode 600 is attached to the front side of the cathode gas flow field plate 700, the back side of the cathode gas flow field plate 700 is attached to the front side of the rear special plate 800, the back side of the rear special plate 800 is attached to the front side of the rear current collecting plate 900, the back side of the rear current collecting plate 900 is attached to the front side of the rear insulating plate 1000, and the back side of the rear insulating plate 1000 is attached to the front side of the rear plate 1100. After the attachment is completed, the fastening screws are used to pass through the corresponding 8 circular mounting holes on each component in sequence to realize the connection and fixation of each component.

[0056] After the assembly is completed, the operation starts: the cathode gas enters from the cathode gas inlet hole 120 of the front end plate 100, and is secondary distributed in the cathode gas redistribution slot 220 of the front insulating plate 200, passing through the fluid inlet of the front current collecting plate 300, the cathode gas inlet 420 of the front special plate 400, the cathode gas inlet 520 and the back-facing air intake comb 521 of the anode liquid flow field plate 500, the membrane electrode 600, and reaches the cathode gas inlet 720 of the cathode gas flow field plate 700, the cathode gas bottom slot 810 and the back-facing air intake comb 521 of the rear special plate 800. The tooth comb 811 refluxes through the back air inlet 721 to enter the cathode gas flow field 750 on the front side from the back side of the cathode gas flow field plate 700, and then is discharged from the cathode gas outlet 720, sequentially passing through the membrane electrode 600, the cathode gas outlet 520 and the back air inlet tooth comb 521 of the anode liquid flow field plate 500, the cathode gas outlet 420 of the front special plate 400, the fluid outlet of the front current collecting plate 300, the cathode gas redistribution groove 220 of the front insulating plate 200 and the cathode gas outlet 120 of the front end plate 100, to form a U-shaped channel.

[0057] After the anode liquid enters from the anode liquid inlet hole 110 of the front end plate 100, it is redistributed in the anode liquid redistribution groove 210 of the front insulating plate 200, passes through the fluid inlet of the front current collecting plate 300 and the anode liquid inlet 410 of the front special plate 400 to reach the anode liquid inlet 510 of the anode liquid flow field plate 500, and enters from the back of the anode liquid flow field plate 500 to the anode liquid flow field 550 on the front through the bottom small hole 5111 of the back-facing liquid inlet comb 511, and is discharged from the anode liquid outlet 510 through the membrane electrode 600, the cathode electrode 600 and the cathode electrode 600. The anode liquid inlet 710 of the cathode gas flow field plate 700, the anode liquid bottom trough 820 and the back-facing liquid inlet comb 821 of the rear special plate 800, and then refluxes sequentially through the anode liquid outlet 710 of the cathode gas flow field plate 700, the membrane electrode 600, the anode liquid outlet 510 of the anode liquid flow field plate 500, the anode liquid outlet 410 of the front special plate 400, the fluid outlet of the front current collecting plate 300, the anode liquid redistribution groove 210 of the front insulating plate 200, and the anode liquid outlet 110 of the front end plate 100 to form a U-shaped channel.

[0058] After the coolant enters from the coolant inlet 130 of the front end plate 100, it is redistributed in the coolant redistribution groove 230 of the front insulating plate 200, passes through the fluid inlet of the front current collecting plate 300, the coolant inlet 430 of the front special plate 400, reaches the coolant inlet 530 of the anode liquid flow field plate 500, flows through the first coolant flow field 560, and then is discharged from the coolant outlet 530 through the membrane electrode 600, the coolant inlet 730 of the cathode gas flow field plate 700, and the coolant bottom groove 830 of the rear special plate 800, and flows through the second coolant flow field 560. After the cooling liquid flow field 860, it flows out from the cooling liquid bottom tank 830, and then refluxes through the cooling liquid outlet 730 of the cathode gas flow field plate 700, the membrane electrode 600, the cooling liquid outlet 530 of the anode liquid flow field plate 500, the first cooling liquid flow field 560, the cooling liquid inlet 530 of the anode liquid flow field plate 500, the cooling liquid outlet 430 of the front special plate 400, the fluid outlet of the front current collecting plate 300, the cooling liquid redistribution groove 230 of the front insulating plate 200, and the cooling liquid outlet 130 of the front end plate 100 in sequence to form a U-shaped channel.

[0059] Figure 5 The columnar distribution diagram of the product selectivity of the temperature-controllable high-power carbon dioxide electrolysis device of the present invention under temperature-controlled and non-temperature-controlled conditions. It can be seen from the figure that when the current reaches 100A, the CO selectivity of the electrolysis device under non-temperature-controlled conditions drops to 49%, and H 2 Selectivity increased to 50% (see Figure 5 g); under temperature control conditions (the temperature is controlled at 25°C), the CO selectivity of the electrolyzer increases to 81%, and H 2 The selectivity dropped to 18% (see Figure 5 h) in the figure shows that constant temperature control can improve the product selectivity and performance of the electrolysis device.

[0060] In summary, the present invention designs a coolant channel in a high-power carbon dioxide electrolysis device. By adjusting the flow rate and temperature of the coolant introduced, heat transfer between the components can be achieved, thereby cooling or heating the anode and cathode fluids, improving the uniformity of heat distribution in the electrolysis device, making it temperature controllable during operation and able to operate stably for a long time, and improving the product selectivity and performance of the electrolysis device. The use of a back-to-back air / liquid structure can enhance the uniformity of the fluid, shorten the distance the fluid flows, and improve the mass transfer efficiency. At the same time, the sealing groove achieves a high degree of sealing of the fluids in the electrolysis device, avoiding performance degradation or failure problems caused by mutual leakage of the fluids.

[0061] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A temperature-controllable high-power carbon dioxide electrolysis device, characterized in that: It includes a front special plate, an anode liquid flow field plate, a membrane electrode, a cathode gas flow field plate, and a rear special plate; The front side of the anode liquid flow field plate is provided with a first coolant flow field, and the back side is provided with an anode liquid flow field; A cathode gas flow field is arranged on the front side of the cathode gas flow field plate; A second coolant flow field is provided on the front side of the rear special plate; The front side of the front special plate is attached to the front side of the anode liquid flow field plate; the back side of the anode liquid flow field plate is attached to the anode side of the membrane electrode; the cathode side of the membrane electrode is attached to the front side of the cathode gas flow field plate; the back side of the cathode gas flow field plate is attached to the front side of the rear special plate; The first coolant flow field and the second coolant flow field are for coolant to pass through; the anode liquid, cathode gas and coolant flow in from the back side of the front special plate, pass through the anode liquid flow field plate, membrane electrode, cathode gas flow field plate in sequence, flow out from the front side of the rear special plate, and then flow back to the front special plate in sequence to form a U-shaped channel.

2. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 1, characterized in that: The first coolant flow field, the second coolant flow field, and the anode liquid flow field are parallel flow fields; the cathode gas flow field is one or more of a serpentine flow field, a parallel flow field, and an interdigitated flow field.

3. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 1, characterized in that: The anode liquid flow field plate, membrane electrode, and cathode gas flow field plate are alternately stacked in sequence to form multiple electrolysis units connected in series, and the number of the electrolysis units is 2-50.

4. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 1, characterized in that: It also includes a front end plate, a front insulating plate, a front current collecting plate, a rear current collecting plate, a rear insulating plate, and a rear end plate; the front side of the front end plate is attached to the front side of the front insulating plate, the back side of the front insulating plate is attached to the front side of the front current collecting plate, the back side of the front current collecting plate is attached to the back side of the front special plate, the back side of the rear special plate is attached to the front side of the rear current collecting plate, the back side of the rear current collecting plate is attached to the front side of the rear insulating plate, and the back side of the rear insulating plate is attached to the front side of the rear end plate.

5. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 4, characterized in that: The back of the front insulating plate, the back of the front special plate, the front and back of the anode liquid flow field plate, the front of the cathode gas flow field plate, and the front of the rear special plate are provided with sealing grooves to seal the fluid channel.

6. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 4, characterized in that: The front end plate is provided with cathode gas inlet and outlet holes, anode liquid inlet and outlet holes and coolant inlet and outlet holes; the cathode gas inlet and outlet holes are diagonally symmetrically distributed with respect to the center of the front end plate, with a diameter of 10mm-12mm, the anode liquid inlet and outlet holes are diagonally symmetrically distributed with respect to the center of the front end plate, with a diameter of 12mm-14mm, and the coolant inlet and outlet holes are diagonally symmetrically distributed with respect to the center of the front end plate, with a diameter of 12mm-14mm.

7. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 6, characterized in that: The front insulating plate, the front special plate, the anode liquid flow field plate and the cathode gas flow field plate are provided with cathode gas inlet and outlet, anode liquid inlet and outlet, and cooling liquid inlet and outlet which correspond to the positions of the cathode gas inlet and outlet holes, anode liquid inlet and outlet holes, and cooling liquid inlet and outlet holes respectively.

8. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 7, characterized in that: The front side of the anode liquid flow field plate is also provided with a back-facing air inlet comb located at the bottom of the cathode gas inlet and outlet, and a back-facing liquid inlet comb located at the bottom of the anode liquid inlet and outlet. The bottom small holes of the back-facing air inlet comb are a non-through structure, and the bottom small holes of the back-facing liquid inlet comb are a through structure; the back side of the cathode gas flow field plate is also provided with a back-facing air inlet located below the cathode gas inlet and above the outlet.

9. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 6, characterized in that: The front side of the front insulating plate is also provided with a cathode gas redistribution groove, an anode liquid redistribution groove, and a coolant redistribution groove, which respectively correspond to the positions of the cathode gas inlet and outlet holes, the anode liquid inlet and outlet holes, and the coolant inlet and outlet holes; the front side of the rear special plate is also provided with a cathode gas bottom groove, an anode liquid bottom groove, and a coolant bottom groove, which respectively correspond to the positions of the cathode gas inlet and outlet holes, the anode liquid inlet and outlet holes, and the coolant inlet and outlet holes.

10. The temperature-controllable high-power carbon dioxide electrolysis device according to claim 9, characterized in that: The front side of the rear special plate is also provided with a back-facing air inlet comb located at the bottom of the cathode gas bottom tank, and a back-facing liquid inlet comb located at the bottom of the anode liquid bottom tank.

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