Membrane electrode pool for efficient photo-assisted electrochemical reaction

Abstract

The utility model belongs to the technical field of membrane electrode pool devices, and relates to a membrane electrode pool for efficient photo-assisted electrochemical reaction, the membrane electrode pool comprises a membrane electrode pool and a photo-assisted component, the membrane electrode pool comprises an anode pressure plate, a cathode pressure plate and a membrane electrode clamped between the anode pressure plate and the cathode pressure plate; the photo-assisted assembly comprises a liquid chamber sealing cover and a quartz flow channel; a through hole for mounting the quartz runner is formed in the anode pressing plate, and the quartz runner is mounted on the anode pressing plate in a sealing manner through the liquid chamber sealing cover. Compared with the prior art, the membrane electrode electrolytic tank has the advantages that a traditional membrane electrode electrolytic tank is reconstructed, and the product selectivity can be further improved by designing the quartz light window and introducing a light field in an electro-catalytic reaction, so that the working voltage of the whole battery is lower, and the energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to membrane electrode cell device technical field relates to a kind of for the membrane electrode cell of high-efficiency light-assisted electrochemical reaction. BACKGROUND

[0002] In the electrochemical reaction based on renewable power driving, high selectivity and stability are required to generate target products. Currently, membrane electrode electrolytic cells are used to improve reactant diffusion and eliminate the influence of electrolyte structure, thereby increasing the production rate by 1-2 orders of magnitude. However, the selectivity improvement is still limited, and the selectivity of single product is difficult to further optimize. Therefore, a device is needed that can improve product selectivity based on the structure of membrane electrode reaction cell and through external light field.

[0003] Chinese patent CN221344150U discloses an H-type photoelectrocatalytic flow reactor suitable for various electrochemical reactions. The first and second serpentine flow channel plates are symmetrically arranged on the left and right, and a proton exchange membrane is arranged between the two serpentine flow channel plates. This can to some extent solve the problems of low reaction efficiency and limited product selectivity control of existing photoelectrocatalytic flow reaction cells. However, the reactor of this patent cannot realize direct illumination of the catalyst from the front, resulting in low light utilization efficiency. Therefore, a membrane electrode reaction cell that can directly irradiate the catalyst layer needs to be developed to further improve the selectivity of single product.

[0004] Patent application CN117074483A discloses a high-efficiency stable CO2 reduction flow electrolytic cell, comprising a cathode assembly, an anode assembly and an ion exchange membrane assembly separating the two, the cathode assembly comprising: a quartz window sealing cover, a cathode electrolyte flow field plate, a working electrode and a first sealing insulation layer, the quartz window sealing cover cavity is connected with a CO2 gas inlet hole at one end, and a quartz window is arranged in the quartz window sealing cover cavity; the ion exchange membrane assembly comprises: an ion exchange membrane and a second sealing insulation layer; the anode assembly comprises: an anode bottom plate, an anode material, an anode electrolyte flow field plate and a third sealing insulation layer; the same positions of the four corners of the cathode assembly, the anode assembly and the ion exchange membrane assembly separating the two are provided with threaded holes, and reinforcing bolts are arranged between the inner portions of the threaded holes; the flow electrolytic cell can effectively prevent the electrolyte from seeping out of the back of the working electrode, thereby avoiding the flooding and salting-out phenomena that may occur in the current flow electrolytic cell. However, the patent application is still a flow electrolytic cell developed based on a three-electrode system, and the full-cell voltage is significantly higher than that of a two-electrode membrane electrode system, which limits the industrial application prospect. In addition, under the structure of the flow cell, the light-assisted electrocatalytic reaction cannot be realized, and the product selectivity directional regulation has limitations. Patent application CN106257729A discloses a self-breathing light-assisted biomass fuel cell, comprising a light window, a liquid storage cavity, a sealing gasket, an anode fixed plate, an anode diffusion layer, a membrane electrode, a cathode gas diffusion layer, a cathode current collector plate and an end plate; a sealing gasket is arranged on the inner side of the anode fixed plate and the cathode current collector plate respectively, and a membrane electrode is arranged between the two sealing gaskets, the membrane electrode is provided with a cathode gas diffusion layer on the side located on the cathode current collector plate, the membrane electrode is provided with an anode diffusion layer on the side located on the anode fixed plate, the outer side of the cathode current collector plate is provided with an end plate, the outer side of the anode fixed plate is provided with a liquid storage cavity, a sealing gasket is arranged between the liquid storage cavity and the anode fixed plate, the front surface of the liquid storage cavity is hollowed out and the light window is embedded, and the light window serves as a light entrance; without using any other auxiliary equipment to supply oxygen for the cell, the battery structure is simplified; without strict working conditions, the battery can operate at room temperature. However, the patent application is mainly based on a fuel cell structure, uses light to excite anode materials, converts solar energy into electrical energy, and can only produce a working current of less than 10 mA / cm 2 . Practical new type content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a membrane electrode cell for efficient light-assisted electrochemical reaction, which introduces a light field in the electrocatalytic reaction to further improve the product selectivity.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] The utility model provides a membrane electrode cell for high -efficient light auxiliary electrochemical reaction, including membrane electrode cell and light auxiliary subassembly, membrane electrode cell include anode pressing plate and cathode pressing plate and the membrane electrode of clamping between both, the membrane electrode of clamping between both,

[0008] The light auxiliary subassembly includes a liquid chamber sealing cover and a quartz flow channel.

[0009] The anode pressing plate is provided with a through hole for mounting the quartz flow channel, and the quartz flow channel is sealingly mounted on the anode pressing plate through the liquid chamber sealing cover.

[0010] Further, the light auxiliary subassembly further includes a light source, and the light passes through the quartz flow channel to irradiate the membrane electrode and assist the electrochemical reaction.

[0011] Further, the quartz flow channel is a light-transmitting glass plate, one side of which is provided with a sealing ring and sealingly contacts the membrane electrode.

[0012] Further, the sealing ring is arranged around the quartz flow channel and matches the liquid chamber sealing cover.

[0013] Further, the anode pressing plate is provided with an anode electrolyte inlet and an anode electrolyte outlet, and the inside of the anode pressing plate is provided with an anode cavity for the flow of the anode electrolyte.

[0014] Further, the membrane electrode includes an ion exchange membrane and anode catalyst layers and cathode catalyst layers arranged on both sides of the ion exchange membrane.

[0015] Further, the ion exchange membrane is a high-transmittance ion exchange membrane, the light transmittance of which is greater than 90%, satisfying the photon penetrability, for example, a high-transmittance Sustainion anion membrane, a FUMATECH ion exchange membrane, a Nafion ion membrane, etc.

[0016] Further, the anode catalyst layer is provided with a through hole in the middle, and the light passes through the quartz flow channel and the through hole in sequence and then irradiates the cathode catalyst layer through the ion exchange membrane.

[0017] Further, the cathode pressing plate is provided with a reaction gas inlet and a reaction gas outlet and a channel for the flow of the reaction gas, and the reaction gas enters one side of the membrane electrode through the channel and performs the electrochemical reaction under the light assistance.

[0018] Further, the anode pressing plate and the cathode pressing plate are fixedly connected through bolts.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] (1) The utility model provides a membrane electrode cell for high -efficient light assisted electrochemical reaction, including membrane electrode cell and light assisted assembly, membrane electrode cell includes anode pressing plate and cathode pressing plate and the membrane electrode of clamping between both, light assisted assembly includes liquid chamber sealing cover and quartz flow channel, be equipped with the through -hole of installing quartz flow channel on anode pressing plate, and quartz flow channel is sealedly installed on anode pressing plate through liquid chamber sealing cover. The light assisted assembly still includes light source, and light passes through quartz flow channel, irradiates membrane electrode, assists electrochemical reaction. Cathode electrode pressing plate has with the gas inlet pipeline and gas outlet pipeline of communicating with outside, be used for the gas to be converted and gas product of circulation, anode electrode pressing plate has with the anode liquid inlet and outlet pipeline of communicating with outside, be used for flowing anode electrolyte and liquid product, membrane electrode includes high light transmission ion exchange membrane and the anode catalyst layer and cathode catalyst layer of setting up on both sides thereof. Through the membrane electrode electrolytic cell structure design of above -mentioned, introduce quartz light window, can satisfy external light source irradiation, promote the selectivity of electrocatalytic reaction product, be applicable to a variety of light field assisted electrochemical reaction membrane electrode reaction device.

[0021] (2) The utility model discloses a traditional membrane electrode electrolytic cell is reconstructed and is designed, and the light field is introduced in electrocatalytic reaction, can further improve product selectivity, make the full cell operating voltage lower, and energy utilization efficiency improves. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure schematic diagram of the utility model membrane electrode cell;

[0023] Figure 2 It is the structure exploded schematic diagram of the utility model membrane electrode cell.

[0024] Mark explanation in drawing:

[0025] 1-liquid chamber sealing cover, 2-quartz flow channel, 3-sealing ring, 4-anode pressing plate, 5-anode catalyst layer, 6-ion exchange membrane, 7-cathode catalyst layer, 8-cathode pressing plate. DETAILED DESCRIPTION

[0026] The utility model will be explained in detail in combination with the drawings and specific embodiment. This embodiment is implemented with the utility model technical scheme as the premise, gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the following examples.

[0027] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In the following embodiments or examples, if there is no special description of the function components or structures, it indicates that they are all conventional components or conventional structures adopted in the field to realize the corresponding functions.

[0030] The above embodiments will be described in more detail below in conjunction with specific examples.

[0031] Example 1

[0032] The embodiment provides a membrane electrode cell for efficient light-assisted electrochemical reaction, as shown in Figure 1 、 Figure 2 The membrane electrode cell includes an anode pressing plate 4 and a cathode pressing plate 8, and a membrane electrode clamped between the two; the light-assisted assembly includes a liquid chamber sealing cover 1 and a quartz flow channel 2; the anode pressing plate 4 is provided with a through hole for mounting the quartz flow channel 2, and the quartz flow channel 2 is sealingly mounted on the anode pressing plate 4 through the liquid chamber sealing cover 1.

[0033] In the embodiment, the light-assisted assembly further includes a light source, light passes through the quartz flow channel 2, irradiates the membrane electrode, and assists the electrochemical reaction.

[0034] In the embodiment, the quartz flow channel 2 is a light-transmitting glass plate, one side of which is provided with a sealing ring 3 and sealingly contacts the membrane electrode.

[0035] In this embodiment, the sealing ring 3 is arranged around the quartz flow channel 2 and matches the liquid chamber sealing cover 1. The quartz flow channel 2 is square in shape; the sealing ring 3 is an O-shaped sealing ring with a square hole in the center, which matches the size of the quartz flow channel 2 and is used to accommodate the quartz flow channel 2. The sealing ring 3 matches the liquid chamber sealing cover 1.

[0036] In this embodiment, the anode pressing plate 4 is provided with an anode electrolyte inlet and an anode electrolyte outlet, and the inside of the anode pressing plate 4 is provided with an anode cavity for the flow of anode electrolyte.

[0037] In this embodiment, the membrane electrode includes an ion exchange membrane 6 and anode catalyst layer 5 and cathode catalyst layer 7 arranged on both sides of the ion exchange membrane 6.

[0038] In this embodiment, the ion exchange membrane 6 is a high-transmittance Sustainion anion membrane with a light transmittance of 98%.

[0039] In this embodiment, the anode catalyst layer 5 has a through hole in the middle, and the light passes through the quartz flow channel 2 and the through hole in sequence and then irradiates the cathode catalyst layer 7 through the ion exchange membrane 6.

[0040] In this embodiment, the cathode pressing plate 8 is provided with a reaction gas inlet and a reaction gas outlet, as well as a channel for the flow of reaction gas, which enters the side of the membrane electrode through the channel and undergoes electrochemical reaction under the assistance of light.

[0041] In this embodiment, the anode pressing plate 4 and the cathode pressing plate 8 are fixed by bolt connection.

[0042] The working process of the membrane electrode cell for high-efficiency light-assisted electrochemical reaction in this embodiment is as follows:

[0043] The design and assembly of the membrane electrode cell for high-efficiency light-assisted electrochemical reaction are shown in Figure 1 、 Figure 2 The membrane electrode cell includes an anode pressing plate 4 and a cathode pressing plate 8, and a membrane electrode located between the anode pressing plate 4 and the cathode pressing plate 8, which includes an ion exchange membrane 6 and anode catalyst layer 5 and cathode catalyst layer 7 arranged on both sides of the ion exchange membrane 6.

[0044] The anode pressing plate 4 is provided with an anode electrolyte inlet and an anode electrolyte outlet, and the inside of the anode pressing plate 4 is provided with an anode cavity for the flow of anode electrolyte. The cathode pressing plate 8 is provided with a reaction gas inlet and a reaction gas outlet, as well as a channel for the flow of reaction gas, which enters the side of the membrane electrode through the channel and undergoes electrochemical reaction under the assistance of light.

[0045] A light-assisted component is provided at the center of the anode pressing plate 4, including a liquid chamber sealing cover 1, a quartz flow channel 2, and a sealing ring 3. The quartz flow channel 2 is sealed and installed on the anode pressing plate 4 through the liquid chamber sealing cover 1; a through hole for installing the quartz flow channel 2 is provided on the anode pressing plate 4, and the quartz flow channel 2 is a light-transmitting glass plate with a sealing ring 3 provided on the outside thereof and in sealing contact with the membrane electrode; the sealing ring 3 matches the liquid chamber sealing cover 1. The light-assisted component also includes a single-wavelength LED light source for adding visible light for irradiation during the electrocatalytic reaction. The photoelectrocatalytic conditions include: constant current testing with a current density of 300mA / cm 2 , control the reaction area of ​​cathode catalyst 14 to 0.2cm 2 , lighting conditions include: light power density of 3.5W / cm 2 , with a wavelength of 532nm.

[0046] A hole is punched in the center of the anode catalyst layer 5 to ensure visible light penetration. The ion exchange membrane 6 uses a highly transparent Sustainion anion membrane to separate the cathode and anode catalyst layers. One side of the anode catalyst layer 5 directly contacts the anode pressure plate 4 for electrical conductivity, while the other side is placed in close proximity to the ion exchange membrane 6. One side of the cathode catalyst layer 7 is placed in close proximity to the ion exchange membrane 6. Light passes through the quartz flow channel 2 and the through-holes of the anode catalyst layer 5, then through the ion exchange membrane 6 to the cathode catalyst layer 7. The anode catalyst layer 5 undergoes current-collecting electrolysis via the anode pressure plate 4, while the cathode catalyst layer 7 undergoes current-collecting electrolysis via the cathode pressure plate 8.

[0047] The aforementioned membrane electrode cell can be used in scenarios where a membrane electrode electrolyzer is used for electrocatalytic reactions. For example, carbon monoxide can be converted into acetic acid, carbon dioxide can be converted into ethylene or ethanol, nitrates can be converted into ammonia, nitrogen can be converted into ammonia, and alkanes can be converted into alkenes.

[0048] The following example uses the above-mentioned high-efficiency light-assisted electrochemical reaction membrane electrode cell as an experimental platform to promote the directional conversion of carbon monoxide into acetic acid. The specific reaction formula is:

[0049] Cathode reaction: 2CO+3H2O+4e － →CH3COO － +3OH －

[0050] Anode reaction: 2OH － →O2+2H + +4e －

[0051] The light passes through the quartz flow channel 2, irradiates the membrane electrode, and assists the electrochemical reaction. The anode electrolyte is 1M KOH, the electrolyte enters the anode cavity provided in the anode pressing plate 4 for anode electrolyte flow from the anode electrolyte inlet, the electrolyte flow rate is 10mL / min, and the electrolyte is discharged from the anode electrolyte outlet after electrolysis; the carbon monoxide, i.e. CO gas, is introduced into the cathode pressing plate 8 from the reaction gas inlet in the cathode pressing plate 8, the gas flow rate is 10mL / min, and the pressure is 1bar. The CO enters the cathode catalyst layer 7 on one side of the cathode pressing plate 8 along the gas channel, reacts to generate acetic acid, and the reacted gas is discharged from the reaction gas outlet on the cathode pressing plate 8.

[0052] Compared with the electrocatalytic reaction without the assistance of the light source, i.e. without the light-assisted assembly, the membrane electrode cell in the embodiment uses the light source to assist the directional conversion of carbon monoxide into acetic acid, and the current density is 300mA / cm 2 The selectivity of acetic acid is as high as 75%, and the cell voltage is reduced by 210mV, which is a remarkable effect.

[0053] The above description of the embodiments is for the convenience of the ordinary skilled person in the art to understand and use the utility model. Those skilled in the art can obviously make various modifications to the embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A membrane electrode cell for efficient photo-assisted electrochemical reactions, characterized by, The application relates to a photo-assisted membrane electrode cell. The photo-assisted membrane electrode cell comprises an anode pressing plate (4) and a cathode pressing plate (8), and a membrane electrode sandwiched between the two plates. The photo-assisted assembly comprises a liquid chamber sealing cover (1) and a quartz flow channel (2). The anode pressing plate (4) is provided with a through hole for installing the quartz flow channel (2), and the quartz flow channel (2) is sealed and installed on the anode pressing plate (4) through the liquid chamber sealing cover (1).

2. A membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The photo-assisted assembly further comprises a light source, and light passes through the quartz flow channel (2) to irradiate the membrane electrode and assist the electrochemical reaction.

3. A membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 1 or 2, characterized in that, The quartz flow channel (2) is a light-transmitting glass plate, one side of which is provided with a sealing ring (3) and is in sealing contact with the membrane electrode.

4. A membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 3, wherein, The sealing ring (3) is arranged on the periphery of the quartz flow channel (2) and is matched with the liquid chamber sealing cover (1).

5. The membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 1, wherein, The anode pressing plate (4) is provided with an anode electrolyte inlet and an anode electrolyte outlet, and the inside of the anode pressing plate (4) is provided with an anode cavity for the flow of anode electrolyte.

6. The membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 1, wherein, The membrane electrode comprises an ion exchange membrane (6) and anode catalyst layers (5) and cathode catalyst layers (7) arranged on both sides of the ion exchange membrane (6).

7. A membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 6, wherein, The ion exchange membrane (6) is a high-transmittance ion exchange membrane, and the light transmittance is greater than 90%.

8. A membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 6, wherein, The anode catalyst layer (5) is provided with a through hole in the middle, and light passes through the quartz flow channel (2) and the through hole in sequence and then irradiates the cathode catalyst layer (7).

9. The membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 1, wherein, The cathode pressing plate (8) is provided with a reaction gas inlet and a reaction gas outlet, and a channel for the flow of reaction gas, and the reaction gas enters the side of the membrane electrode through the channel and performs electrochemical reaction under the photo-assisted condition.

10. The membrane electrode cell for efficient photo-assisted electrochemical reactions according to claim 1, wherein, The anode pressing plate (4) and the cathode pressing plate (8) are fixedly connected through bolts.

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