Catalyst coating membrane structure, membrane electrode and device for producing hydrogen by electrolyzing water
By introducing a hydrophobic hydrogen barrier layer into the proton exchange membrane water electrolysis device, and using hydrophobic resin particles of the polymer thin film layer to reduce hydrogen permeation, the problems of high hydrogen permeability and high cost are solved, thereby improving safety and reducing costs.
Patent Information
- Application Number
- CN202423218792.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-25
AI Technical Summary
In existing proton exchange membrane electrolysis water production devices, the high hydrogen permeability leads to safety hazards and high costs. Existing methods to reduce this permeability increase the load of precious metals.
A hydrophobic hydrogen barrier layer is set between the cathode catalyst layer and the proton exchange membrane. Hydrophobic resin particles of a polymer thin film layer are used to reduce hydrogen permeation, thus avoiding the use of precious metal catalysts.
This reduces hydrogen permeability, lowers the hydrogen concentration in the oxygen on the anode side, improves the safety of the electrolyzer, and reduces the cost of catalyst coating, while maintaining the high performance of the water electrolysis hydrogen production unit.
Smart Images
Figure CN223936619U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water electrolysis, and more specifically, to a catalyst coating membrane structure and membrane electrolysis for hydrogen production via water electrolysis.
[0002] Polar and device. Background Technology
[0003] Hydrogen energy boasts unique advantages such as zero greenhouse gas emissions, high power density, and high energy conversion efficiency. Green hydrogen produced through water electrolysis is a clean and green energy source. Proton exchange membrane electrolysis (PEMWE) for hydrogen production possesses rapid dynamic response capabilities, showing broad application prospects in scenarios such as mitigating wind and solar power fluctuations, supporting dynamic power balance in the power grid, and large-scale storage and efficient consumption of new energy sources. The characteristics of high operating pressure, low hydrogen and oxygen permeability, fast response speed, and high energy density make it possible to efficiently produce high-purity green hydrogen when proton exchange membrane electrolyzers are combined with renewable energy power supply.
[0004] PEMWE mainly consists of components such as a proton exchange membrane (PEM), a catalyst layer, a porous transport layer, and bipolar plates. However, PEM membranes using PFSA substrates exhibit some hydrogen cross-permeation, allowing hydrogen to permeate from the PEM to the anode. This not only reduces the efficiency of the PEMWE but also poses serious safety risks. The hydrogen concentration threshold in the hydrogen-oxygen gas mixture that can cause an explosion is very low, at 4 vol.%. Therefore, reducing the hydrogen concentration in the oxygen on the anode side is particularly important.
[0005] Currently, the main strategies for reducing hydrogen permeation in PEMWE include adjusting membrane thickness or composition, optimizing PEM packing materials, and adding additional hydrogen-removing coatings. In recent years, an effective hydrogen removal method has been to add an active and stable hydroxide catalyst coating to the anode side. Cross-permeable hydrogen will react with oxygen generated on the anode side through this coating, "recombining" into water, thus achieving hydrogen removal. However, adding a catalyst coating increases the noble metal loading of the membrane and raises the cost of the electrolyzer. Therefore, developing a novel, low-cost catalyst coating to reduce hydrogen permeation is of great significance. Utility Model Content
[0006] This invention aims to overcome at least one defect (deficiency) of the prior art and provides a catalyst-coated membrane structure, membrane electrode and device for hydrogen production by water electrolysis, which reduces the hydrogen permeability of the membrane electrode for hydrogen production by water electrolysis and is low in cost.
[0007] One objective of this invention is to provide a catalyst coating membrane structure for hydrogen production by water electrolysis. The catalyst coating membrane structure includes a proton exchange membrane, a cathode catalytic layer, and an anode catalytic layer. The cathode catalytic layer and the anode catalytic layer are respectively disposed on both sides of the proton exchange membrane, and a hydrophobic hydrogen barrier layer is provided between the proton exchange membrane and the cathode catalytic layer.
[0008] In this technical solution, an additional hydrophobic hydrogen barrier layer is placed between the cathode catalyst layer and the proton exchange membrane to reduce hydrogen permeation to the anode. The hydrophobic nature of this layer prevents hydrogen permeation due to swelling caused by water absorption. Thus, the hydrophobic hydrogen barrier layer reduces hydrogen permeability, thereby lowering the hydrogen concentration in the oxygen on the anode side, reducing the risk of explosion, and improving the safety factor of the electrolyzer during operation. Furthermore, compared to the current method of adding an active and stable hydroxide catalyst coating to the anode side, this solution does not use expensive metal and metal oxide catalysts, achieving hydrogen barrier effects while reducing the cost of the catalyst coating membrane (CCM). Moreover, while reducing hydrogen permeability, it ensures the normal operation of other mass transfer processes, achieving high performance of the water electrolysis hydrogen production unit even with a low hydrogen content in the oxygen on the anode side, thus improving the safety of the electrolyzer during operation.
[0009] Furthermore, the hydrophobic hydrogen barrier layer is a polymer film layer, which includes hydrophobic resin particles, such as polytetrafluoroethylene particles, polyvinylidene fluoride particles, fluorinated ethylene propylene copolymer particles, or perfluoroalkoxy resin particles. That is, the hydrophobic additive in the hydrophobic hydrogen barrier layer is a concentrated dispersion of polytetrafluoroethylene (PTFE), polyvinylidene fluoride powder (PVDF), fluorinated ethylene propylene copolymer (FEP), or perfluoroalkoxy resin (PFA). In one or more embodiments of this invention, the hydrophobic additive may also be a combination of the above hydrophobic additives.
[0010] Furthermore, the thickness of the hydrophobic hydrogen barrier layer is 3 μm to 20 μm. Preferably, the thickness is 3 μm to 8 μm.
[0011] Furthermore, the thickness ratio of the anode catalyst layer, proton exchange membrane, hydrogen barrier coating and cathode catalyst layer is (10~100):(10~100):(3~20):(10~100).
[0012] Furthermore, the area of the hydrophobic hydrogen barrier layer is the same as the area of the cathode catalyst layer.
[0013] Furthermore, the hydrophobic hydrogen barrier catalyst layer is applied to the proton exchange membrane by hot pressing transfer or direct coating.
[0014] Furthermore, the hydrophobic hydrogen barrier layer comprises a hydrophobic additive and an ionomer. The hydrophobic hydrogen barrier layer is made of a hydrogen barrier coating slurry, which comprises a hydrophobic additive, an ionomer solution, deionized water, and a liquid alcohol. The slurry has a solids content of 5 wt% to 20 wt%, the hydrophobic additive accounts for 3 wt% to 20 wt% of the solids content, and the ratio of the liquid alcohol to deionized water is 2:8 to 5:5.
[0015] Furthermore, the ionic polymer solution is a perfluorosulfonic acid resin dispersion. Preferably, the perfluorosulfonic acid resin dispersion is one or a mixture of Chemours Nafion D2020 perfluorosulfonic acid resin dispersion, Nafion D2021 perfluorosulfonic acid resin dispersion, AGCIC100, AGCIC54 perfluorosulfonic acid resin dispersion, Dongyue EW900, EW800 perfluorosulfonic acid resin dispersion, and Synesqo D79, D87, and D98.
[0016] Furthermore, the liquid alcohol is an alcohol with 1 to 8 carbon atoms. Preferably, the liquid alcohol is one or a mixture of ethanol, propanol, butanol, ethylene glycol, ethoxyethanol, and methoxyethanol.
[0017] Furthermore, the anode and cathode catalyst slurry and the hydrogen barrier coating slurry are dispersed and mixed using one or more of the following: ultrasonic disperser, homogenizer, ball mill, and planetary mixer.
[0018] Furthermore, in the cathode catalytic layer, the catalyst is a substance containing noble metal elements and / or transition metal elements. Noble metal elements include Pt, Pd, or Au, and transition metal elements include Fe, Co, Ni, Cu, Mo, or W. The catalyst can be an element, alloy, or oxide of the above elements.
[0019] In the anode catalyst layer, the catalyst is a substance containing at least one of the elements Ir and Ru. The catalyst can be an element, alloy, and / or oxide of the above elements.
[0020] Furthermore, the anode catalyst layer, the hydrophobic hydrogen barrier layer, and the cathode catalyst layer use the same ionomer, including PFSA ionomers with an EW value of 700-1100. The proton exchange membrane is selected from one of the following: perfluorosulfonic acid polymer type proton exchange membranes, modified proton exchange membranes, and enhanced proton exchange membranes.
[0021] Another objective of this invention is to provide a membrane electrode for hydrogen production by water electrolysis, comprising an anode gas diffusion layer, a cathode gas diffusion layer, and a catalyst-coated membrane structure of any one of the above, wherein the anode gas diffusion layer is connected to the outside of the anode catalyst layer, and the cathode gas diffusion layer is connected to the outside of the cathode catalyst layer.
[0022] Furthermore, the thickness of the membrane electrode is 10~200 μm.
[0023] Another objective of this invention is to provide a water electrolysis hydrogen production device, which includes an electrolyzer and a membrane electrode assembly of any of the above-mentioned types. The membrane electrodes are assembled in series, and bipolar plates are provided on both sides of the membrane electrode. The outer side of the anode gas diffusion layer is the oxygen plate of the bipolar plate, and the outer side of the cathode gas diffusion layer is the hydrogen plate of the bipolar plate. Terminal plates are provided on both sides inside the electrolyzer.
[0024] Furthermore, the water electrolysis hydrogen production device is provided with a plurality of membrane frames, and each membrane frame contains one membrane electrode. The number of membrane frames is the same as the number of membrane electrode structures in the water electrolysis hydrogen production device.
[0025] Compared with existing technologies, the beneficial effects of this invention are as follows: the hydrophobic hydrogen barrier layer reduces hydrogen permeability, thereby reducing the hydrogen concentration in the oxygen on the anode side, reducing the risk of explosion, and improving the safety factor of the electrolyzer during operation. Furthermore, compared to the current method of adding an active and stable hydroxide catalyst coating to the anode side, this solution does not use expensive metal and metal oxide catalysts, achieving hydrogen barrier effects while reducing the cost of the catalyst coating film (CCM). Moreover, while reducing hydrogen permeability, it ensures the normal operation of other mass transfer processes, achieving high performance of the water electrolysis hydrogen production device even with a low hydrogen content in the oxygen on the anode side, thus improving the safety of the electrolyzer during operation. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the catalyst coating film in Example 1.
[0027] Figure reference numerals: Anode catalyst layer 100, proton exchange membrane 200, hydrophobic hydrogen barrier layer 300, cathode catalyst layer 400. Detailed Implementation
[0028] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to specific embodiments.
[0029] One objective of this invention is to provide a catalyst coating membrane structure for hydrogen production by water electrolysis. The catalyst coating membrane structure includes a proton exchange membrane, a cathode catalytic layer, and an anode catalytic layer. The cathode catalytic layer and the anode catalytic layer are respectively disposed on both sides of the proton exchange membrane, and a hydrophobic hydrogen barrier layer is provided between the proton exchange membrane and the cathode catalytic layer.
[0030] Furthermore, the hydrophobic hydrogen barrier layer is a polymer film layer, which includes hydrophobic resin particles, such as polytetrafluoroethylene particles, polyvinylidene fluoride particles, fluorinated ethylene propylene copolymer particles, or perfluoroalkoxy resin particles.
[0031] Furthermore, the thickness of the hydrophobic hydrogen barrier layer is 3 μm to 20 μm. Preferably, the thickness is 3 μm to 8 μm.
[0032] Furthermore, the thickness ratio of the anode catalyst layer, proton exchange membrane, hydrogen barrier coating and cathode catalyst layer is (10~100):(10~100):(3~20):(10~100).
[0033] Furthermore, the area of the hydrophobic hydrogen barrier layer is the same as the area of the cathode catalyst layer.
[0034] Furthermore, the hydrophobic hydrogen barrier layer is applied to the proton exchange membrane by hot pressing or direct coating.
[0035] Another objective of this invention is to provide a membrane electrode for hydrogen production by water electrolysis, comprising an anode gas diffusion layer, a cathode gas diffusion layer, and a catalyst-coated membrane structure of any one of the above, wherein the anode gas diffusion layer is connected to the outside of the anode catalyst layer, and the cathode gas diffusion layer is connected to the outside of the cathode catalyst layer.
[0036] Furthermore, the thickness of the membrane electrode is 10~200 μm.
[0037] Another objective of this invention is to provide a water electrolysis hydrogen production device, which includes an electrolyzer and a membrane electrode assembly of any of the above-mentioned types. The membrane electrodes are assembled in series, and bipolar plates are provided on both sides of the membrane electrode. The outer side of the anode gas diffusion layer is the oxygen plate of the bipolar plate, and the outer side of the cathode diffusion layer is the hydrogen plate of the bipolar plate. Terminal plates are provided on both sides inside the electrolyzer.
[0038] Furthermore, the water electrolysis hydrogen production device is provided with a plurality of membrane frames, and each membrane frame contains one membrane electrode. The number of membrane frames is the same as the number of membrane electrode structures in the water electrolysis hydrogen production device.
[0039] Example 1
[0040] like Figure 1 As shown, this embodiment provides a catalyst-coated membrane structure for hydrogen production via water electrolysis. The catalyst-coated membrane structure...
[0041] The structure includes: a proton exchange membrane 200, a cathode catalytic layer 400 and an anode catalytic layer 100, wherein the cathode catalytic layer 400 and the anode catalytic layer 100 are respectively disposed on both sides of the proton exchange membrane 200, and a hydrophobic hydrogen barrier layer 300 is disposed between the proton exchange membrane 200 and the cathode catalytic layer 400.
[0042] Example 2
[0043] This embodiment provides a method for preparing a catalyst-coated film, used to prepare the catalyst-coated film provided in Example 1.
[0044] In the catalyst coating film prepared in this embodiment, the iridium loading in the anodic catalyst layer is 1.25 mg / cm³. 2 The platinum loading in the cathode catalyst layer is 0.3 mg / cm³. 2 The preparation method includes the following steps:
[0045] (1) 1 g of polytetrafluoroethylene concentrated dispersion with a solid content of 60%, 24 g of n-propanol, 13 g of water, and 61 g of Nafion D2020 perfluorosulfonic acid resin dispersion with a solid content of 23% were mixed and rapidly stirred to obtain a pre-dispersed hydrophobic hydrogen barrier layer slurry. The pre-dispersed hydrophobic hydrogen barrier layer slurry was transferred to a ball mill jar and ball milled for 1 hour. After that, the ball-milled slurry was degassed to obtain the hydrophobic hydrogen barrier layer slurry.
[0046] (2) After the hydrophobic hydrogen barrier layer slurry is applied to the cathode side of the proton exchange membrane by slit coating and dried, a hydrogen barrier coating is formed on the cathode side of the proton exchange membrane, and the thickness of the hydrogen barrier coating is 5 μm.
[0047] (3) The anode and cathode catalyst layers were transferred to the proton exchange membrane with hydrogen barrier coating on the cathode side by double-sided transfer at a transfer temperature of 130 °C and a transfer time of 10 min to obtain CCM.
[0048] Example 3
[0049] This embodiment provides a method for preparing a catalyst-coated film, used to prepare the catalyst-coated film provided in Example 1.
[0050] In the catalyst coating film prepared in this embodiment, the iridium loading in the anodic catalyst layer is 1.25 mg / cm³. 2 The platinum loading in the cathode catalyst layer is 0.3 mg / cm³. 2 The preparation method includes the following steps:
[0051] (1) 3 g of polytetrafluoroethylene concentrated dispersion with a solid content of 60%, 26 g of n-propanol, 14 g of water, and 58 g of Nafion D2020 perfluorosulfonic acid resin dispersion with a solid content of 23% were mixed and rapidly stirred to obtain a pre-dispersed hydrophobic hydrogen barrier layer slurry. The pre-dispersed hydrophobic hydrogen barrier layer slurry was transferred to a ball mill jar and ball milled for 1 hour. After that, the ball-milled slurry was degassed to obtain the hydrophobic hydrogen barrier layer slurry.
[0052] (2) After the hydrophobic hydrogen barrier layer slurry is applied to the cathode side of the proton exchange membrane by slit coating and dried, a hydrogen barrier coating is formed on the cathode side of the proton exchange membrane, and the thickness of the hydrogen barrier coating is 6 μm.
[0053] (3) The anode and cathode catalyst layers were transferred to the proton exchange membrane with hydrogen barrier coating on the cathode side by double-sided transfer at a transfer temperature of 160 °C and a transfer time of 3 min to obtain CCM.
[0054] Example 4
[0055] This embodiment provides a method for preparing a catalyst-coated film, used to prepare the catalyst-coated film provided in Example 1.
[0056] In the catalyst coating film prepared in this embodiment, the iridium loading in the anodic catalyst layer is 1.25 mg / cm³. 2 The platinum loading in the cathode catalyst layer is 0.3 mg / cm³. 2 The preparation method includes the following steps:
[0057] (1) 4 g of polytetrafluoroethylene concentrated dispersion with a solid content of 60%, 27 g of n-propanol, 14 g of water, and 55 g of Nafion D2020 perfluorosulfonic acid resin dispersion with a solid content of 23% were mixed and rapidly stirred to obtain a pre-dispersed hydrophobic hydrogen barrier layer slurry. The pre-dispersed hydrophobic hydrogen barrier layer slurry was transferred to a ball mill jar and ball milled for 1 hour. After that, the ball-milled slurry was degassed to obtain the hydrophobic hydrogen barrier layer slurry.
[0058] (2) The hydrophobic hydrogen barrier layer slurry is applied to the cathode side of the proton exchange membrane by slit coating and dried to form a hydrogen barrier coating on the cathode side of the proton exchange membrane. The thickness of the hydrogen barrier coating is 8 μm.
[0059] (3) The anode and cathode catalyst layers were transferred to the proton exchange membrane with hydrogen barrier coating on the cathode side by double-sided transfer at a transfer temperature of 150 °C and a transfer time of 6 min to obtain CCM.
[0060] Example 5
[0061] This embodiment provides a method for preparing a catalyst-coated film, used to prepare the catalyst-coated film provided in Example 1.
[0062] In the catalyst coating film prepared in this embodiment, the iridium loading in the anodic catalyst layer is 1.25 mg / cm³. 2 The platinum loading in the cathode catalyst layer is 0.3 mg / cm³. 2 The preparation method includes the following steps:
[0063] (1) 1.5 g of polyvinylidene fluoride powder, 26 g of n-propanol, 14 g of water, and 59 g of Nafion D2020 perfluorosulfonic acid resin dispersion with a solid content of 23% were mixed and stirred rapidly to obtain a pre-dispersed hydrophobic hydrogen barrier layer slurry. The pre-dispersed hydrophobic hydrogen barrier layer slurry was transferred to a ball mill jar and ball milled for 1 hour. After that, the ball-milled slurry was degassed to obtain the hydrophobic hydrogen barrier layer slurry.
[0064] (2) A hydrophobic hydrogen barrier layer slurry is applied to the cathode side of a proton exchange membrane by slit coating to form a hydrogen barrier coating on the cathode side of the proton exchange membrane. The thickness of the hydrogen barrier coating is 8 μm.
[0065] (3) The anode and cathode catalyst layers were transferred to the proton exchange membrane with hydrogen barrier coating on the cathode side by double-sided transfer at a transfer temperature of 150 °C and a transfer time of 6 min to obtain CCM.
[0066] Comparative Example 1
[0067] This comparative example provides a catalyst coating film, in which the iridium loading in the anodic catalyst layer is 1.25 mg / cm³. 2 The platinum loading in the cathode catalyst layer is 0.3 mg / cm³. 2 The catalyst coating film does not have a hydrophobic hydrogen barrier layer and is prepared through the following steps:
[0068] The anode and cathode catalytic layers were transferred onto the proton exchange membrane using a double-sided transfer method at a transfer temperature of 150 °C and a transfer time of 8 min to obtain the CCM.
[0069] Comparative Example 2
[0070] This comparative example provides a catalyst-coated film with a hydrogen barrier layer but no hydrophobic agent added. The iridium loading in the anode catalyst layer is 1.25 mg / cm³. 2 The platinum loading in the cathode catalyst layer is 0.3 mg / cm³. 2 The catalyst-coated film was prepared by the following steps:
[0071] (1) 24 g of n-propanol, 13 g of water and 62 g of Nafion D2020 perfluorosulfonic acid resin dispersion with a solid content of 23% were mixed and stirred rapidly to obtain a pre-dispersed hydrogen barrier layer slurry. The pre-dispersed hydrogen barrier layer slurry was transferred to a ball mill jar and ball milled for 1 hour. After that, the ball-milled slurry was degassed to obtain the hydrogen barrier layer slurry.
[0072] (2) Apply hydrogen barrier coating slurry to the cathode side of proton exchange membrane by slit coating to form a hydrogen barrier coating on the cathode side of proton exchange membrane, wherein the thickness of the hydrogen barrier layer is 4 μm;
[0073] (3) The anode and cathode catalyst layers were transferred to the proton exchange membrane with hydrogen barrier coating on the cathode side by a double-sided transfer method with a transfer temperature of 140 °C and a transfer time of 5 min to obtain CCM.
[0074] The CCMs obtained in Examples 2-5, and Comparative Examples 1 and 2, were subjected to electrochemical performance tests for hydrogen production via water electrolysis. The electrolyzer temperature was 80 °C during the tests. The test results are shown in Table 1.
[0075] Table 1 shows the CCM at 3 MPa pressure and 0.6 A / cm. 2 Voltage at current density and hydrogen content in oxygen
[0076]
[0077] The test results show that the voltage of the CCM with the hydrophobic hydrogen barrier layer increases slightly, and even with the addition of a low proportion of hydrophobic additives to the hydrophobic hydrogen barrier layer, the CCM can still maintain high electrical performance.
[0078] Whether the catalyst coating film had no hydrophobic hydrogen barrier layer (Comparative Example 1) or no hydrophobic agent was added to the hydrogen barrier layer (Comparative Example 2), the hydrogen content on the anode side remained high. In Comparative Example 2, the hydrogen barrier layer consisted only of resin, which effectively increased the film thickness. Although this reduced hydrogen permeation slightly, the hydrogen barrier effect was still inferior compared to the hydrogen barrier layer with added hydrophobic substances. In contrast, the CCMs in Examples 2-5 showed significantly lower hydrogen content in the anode oxygen compared to Comparative Examples 1-2, indicating that the catalyst coating film of this invention effectively reduces the hydrogen permeation rate to the anode.
[0079] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model.
[0080] This is not a limitation on the specific embodiments of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model shall be included within the protection scope of the claims of this utility model.
Claims
1. A catalyst coating membrane structure for hydrogen production via water electrolysis, the catalyst coating membrane structure comprising: The proton exchange membrane, the cathode catalytic layer, and the anode catalytic layer are respectively disposed on both sides of the proton exchange membrane. The proton exchange membrane and the cathode catalytic layer are characterized in that a hydrophobic hydrogen barrier layer is provided between the proton exchange membrane and the cathode catalytic layer, the thickness of the hydrophobic hydrogen barrier layer is 3μm~20μm, and the area of the hydrophobic hydrogen barrier layer is the same as the area of the cathode catalytic layer.
2. The catalyst coating membrane structure for hydrogen production by water electrolysis according to claim 1, characterized in that, The thickness ratio of the anode catalyst layer, proton exchange membrane, hydrogen barrier coating and cathode catalyst layer is (10~100):(10~100):(3~20):(10~100).
3. The catalyst coating membrane structure for hydrogen production by water electrolysis according to any one of claims 1 or 2, characterized in that, The hydrophobic hydrogen barrier layer is applied to the proton exchange membrane by hot pressing or direct coating.
4. A membrane electrode for hydrogen production by water electrolysis, characterized in that, It includes an anode gas diffusion layer, a cathode gas diffusion layer, and a catalyst coating film structure as described in any one of claims 1 or 2, wherein the anode gas diffusion layer is connected to the outside of the anode catalyst layer, and the cathode gas diffusion layer is connected to the outside of the cathode catalyst layer.
5. The membrane electrode for hydrogen production by water electrolysis according to claim 4, characterized in that, The thickness of the membrane electrode is 10~200 μm.
6. A water electrolysis hydrogen production device, characterized in that, The water electrolysis hydrogen production device includes an electrolyzer and a membrane electrode assembly for water electrolysis hydrogen production as described in any one of claims 4 or 5. The membrane electrodes for water electrolysis hydrogen production are assembled in series. Bipolar plates are provided on both sides of the membrane electrode. The outer side of the anode gas diffusion layer is the oxygen plate of the bipolar plate, and the outer side of the cathode gas diffusion layer is the hydrogen plate of the bipolar plate. Terminal plates are provided on both sides inside the electrolyzer.
7. The water electrolysis hydrogen production apparatus according to claim 6, characterized in that, The water electrolysis hydrogen production device is provided with a number of membrane frames, and each membrane frame contains one membrane electrode. The number of membrane frames is the same as the number of membrane electrode structures in the water electrolysis hydrogen production device.