Membrane electrode structure for hydrogen production by electrolysis of water using a proton exchange membrane
By introducing a sealing frame and inner and outer frame structures into the membrane electrode, the gas diffusion layer and the catalyst coating membrane are isolated, solving the problems of burr damage and membrane swelling, achieving higher safety and stability, and ensuring the performance of hydrogen production by water electrolysis.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOHYKEY TECHNOLOGY (GUANGZHOU) CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-07-21
AI Technical Summary
In traditional membrane electrodes, sharp burrs in the gas diffusion layer can easily damage the catalyst coating membrane, leading to hydrogen permeation and safety hazards. Furthermore, swelling of the proton exchange membrane increases the risk of compression, affecting the performance and safety of hydrogen production through water electrolysis.
The cathode and anode sealing frames are combined with an inner and outer frame structure. The gas diffusion layer is connected to the top surface of the inner frame to form a stepped structure, which avoids sharp burrs from contacting the catalyst coating film. The appropriate inner frame thickness design prevents the film from being squeezed after swelling, thus ensuring the integrity of the catalyst coating film.
It effectively prevents burrs in the gas diffusion layer from damaging the catalyst coating membrane, reduces hydrogen permeation, improves the safety and stability of the membrane electrode, and ensures that the hydrogen production performance of water electrolysis is not affected.
Smart Images
Figure CN224531062U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of proton exchange membrane electrolysis of water, and more specifically, to a membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen. Background Technology
[0002] Proton exchange membrane (PEM) water electrolysis is a highly efficient method that uses a solid proton exchange membrane as the electrolyte to electrochemically decompose water and produce high-purity hydrogen and oxygen. This technology operates at high current densities (typically exceeding 2 A / cm²), achieving an energy conversion efficiency of 70%-80% and producing hydrogen with a purity exceeding 99.99%, eliminating the need for additional purification. Thanks to its rapid response characteristics and modular design, PEM water electrolysis is particularly suitable for integration with fluctuating renewable energy sources (such as wind and solar power) to achieve flexible production and distributed application of green hydrogen energy. The membrane electrode assembly (MEA), as the core component of the PEM electrolyzer, consists of a catalyst-coated membrane (CCM, proton exchange membrane, and anode / cathode catalyst layers) and anode / cathode gas diffusion layers, directly determining the electrolysis efficiency, safety, and equipment lifespan. Currently, high-pressure hydrogen production is an important direction for reducing the energy consumption of subsequent hydrogen compression.
[0003] However, the gas diffusion layer contains sharp burrs, especially prevalent at the edges due to cutting. In traditional membrane electrodes, the gas diffusion layer is in direct contact with the catalyst coating membrane, making it susceptible to damage, particularly under assembly forces and high-pressure gases, which can even puncture the catalyst coating membrane. Furthermore, during PEM electrolyzer operation, the proton exchange membrane swells in water, further increasing the pressure exerted by the catalyst coating membrane on the gas diffusion layer, thus increasing the risk of damage from burrs. Damage or puncture to the catalyst coating membrane not only affects the performance of hydrogen production through water electrolysis but also allows hydrogen produced at the cathode to easily back-permeate to the anode, causing a mixture of hydrogen and oxygen and posing a safety hazard. Utility Model Content
[0004] The present invention aims to overcome at least one defect (deficiency) of the prior art and provide a membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen, thereby avoiding damage to the catalyst coating membrane by the gas diffusion layer.
[0005] One objective of this invention is to provide a membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen, comprising a cathode sealing frame, an anode sealing frame, a catalyst-coated membrane, a cathode gas diffusion layer, and an anode gas diffusion layer. The catalyst-coated membrane is formed by coating both sides of the proton exchange membrane with catalyst layers. Both the cathode sealing frame and the anode sealing frame include an outer frame and an inner frame. The inner frame is annularly connected to the inner wall of the outer frame and forms a stepped structure with the outer frame. The bottom surface of the outer frame is flush with the bottom surface of the inner frame. The catalyst-coated membrane is connected to the bottom surfaces of the inner and outer frames. The cathode gas diffusion layer is connected to the top surface of the inner frame of the cathode sealing frame. The anode gas diffusion layer is connected to the top surface of the inner frame of the anode sealing frame. The thickness of the inner frame is 0.01~0.15mm.
[0006] In this technical solution, following the traditional membrane electrode structure, a cathode catalytic layer is coated on one side of the proton exchange membrane, and an anode catalytic layer is coated on the other side. The cathode sealing frame is connected to the cathode catalytic layer, and the cathode gas diffusion layer is connected to the cathode sealing frame. Similarly, the anode sealing frame is connected to the anode catalytic layer, and the anode gas diffusion layer is connected to the anode sealing frame.
[0007] Both the cathode sealing frame and the anode sealing frame include an outer frame and an inner frame, with their bottom surfaces flush. This allows the catalyst coating film to adhere tightly to the sealing frame without size limitations. A gas diffusion layer is connected to the top surface of the inner frame, positioned within a stepped structure. The sides of the gas diffusion layer abut against the inner wall of the outer frame, and the stepped structure provides restraint for the gas diffusion layer. Preferably, the gas diffusion layer is in contact with the top surface of the inner frame.
[0008] The inner frame separates the catalyst coating film and the gas diffusion layer, especially by directly isolating the circumferential ends of the gas diffusion layer from the catalyst coating film. This ensures that even if the proton exchange membrane swells, the edge of the gas diffusion layer will not come into contact with the catalyst layer on the catalyst coating film, thus avoiding damage from sharp burrs. This ensures that the performance of the membrane electrode is not affected by burrs, and also prevents hydrogen from flowing from the cathode to the anode and causing hydrogen-oxygen mixing due to damage to the catalyst coating film, thereby improving safety.
[0009] If the inner frame is too thin, the space left for the proton exchange membrane to swell will be too small, causing it to be squeezed and deformed upon contact with the rigid gas diffusion layer after swelling, resulting in damage. Conversely, if the inner frame is too thick, the contact between the catalyst coating membrane and the gas diffusion layer will be insufficient, affecting mass transfer and thus the water electrolysis performance. Therefore, this design, while avoiding damage to the catalyst coating membrane from burrs in the gas diffusion layer, also considers the effect of membrane swelling by setting an appropriate thickness for the inner frame. This further prevents the membrane from being squeezed and damaged, improves the stability of the membrane electrode operation, and ensures the performance of the membrane electrode.
[0010] Preferably, the outer frame and the inner frame are integrally connected, and the thickness of the inner frame is 0.03~0.1mm, for example, 0.04mm or 0.08mm.
[0011] Furthermore, the thickness of the inner frame of the cathode sealing frame is a, the thickness of the inner frame of the anode sealing frame is b, the thickness of the proton exchange membrane is c, its swelling ratio is k, the thickness difference between the outer frame and the inner frame of the cathode sealing frame is d, and the thickness of the cathode gas diffusion layer is e. Then a + b = c × k + (ed).
[0012] In this technical solution, the thickness of each structure can be better defined by the above formula, leaving enough space for the swelling of the membrane and avoiding damage to the membrane after swelling.
[0013] Furthermore, the material of the anode gas diffusion layer is one of titanium felt, sintered titanium plate, and porous titanium plate; the thickness difference between the outer frame and the inner frame of the anode sealing frame is the same as the thickness of the anode gas diffusion layer.
[0014] In this technical solution, if the thickness of the gas diffusion layer is greater than the thickness difference between the outer frame and the inner frame, it will be higher than the sealing frame. During the preparation of the membrane electrode, the diffusion layer needs to be squeezed to be flush with the top surface of the sealing frame. Since the compressibility of the anode gas diffusion layer material is poor, the thickness of the anode gas diffusion layer is set to be the same as the thickness difference between the outer frame and the inner frame, that is, the top surface of the anode gas diffusion layer is flush with the top surface of the outer frame.
[0015] Furthermore, the thickness difference between the outer and inner frames of the anode sealing frame is 0.1-1 mm; the thickness difference between the outer and inner frames of the cathode sealing frame is 0.1-3 mm. The thickness of the anode gas diffusion layer is 0.1-1 mm; the thickness of the cathode gas diffusion layer is 0.1-3 mm.
[0016] In this technical solution, an appropriate gas diffusion layer thickness helps ensure its support for the catalyst coating film without affecting mass transfer. An appropriate thickness difference between the inner and outer frames, combined with the gas diffusion layer thickness, prevents excessive compression of the gas diffusion layer, while ensuring a compact membrane electrode structure and avoiding material waste. Preferably, the anode gas diffusion layer thickness is 0.15-0.3 mm, and the cathode gas diffusion layer thickness is 0.15-0.25 mm.
[0017] Furthermore, the inner frame thickness of the anode sealing frame is the same as the inner frame thickness of the cathode sealing frame.
[0018] In this technical solution, the equal thickness of the inner frames on both sides allows the proton exchange membrane to swell uniformly to both sides, which is beneficial to the stability of the membrane electrode operation.
[0019] Furthermore, the bottom surfaces of the outer frame and the inner frame are connected to the catalyst coating film via an adhesive, and the top surface of the inner frame is connected to the gas diffusion layer via an adhesive. The adhesive is at least one of epoxy resin, polyolefin material, acrylate, and acrylic. Furthermore, the materials of the cathode sealing frame and the anode sealing frame are polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), or polytetrafluoroethylene (PTFE).
[0020] Furthermore, a cathode catalytic layer is coated on one side of the proton exchange membrane, and an anode catalytic layer is coated on the other side. A hydrogen removal layer is provided between the anode catalytic layer and the proton exchange membrane.
[0021] In this technical solution, the hydrogen removal layer includes a hydrogen removal catalyst and a resin; the hydrogen removal catalyst includes at least one of platinum black, carbon-supported platinum, alloy catalyst, and non-precious metal catalyst; the resin includes at least one of perfluorosulfonic acid resin, partially fluorinated sulfonic acid resin, non-fluorinated sulfonic acid resin, and hydrocarbon resin; the mass ratio of the resin to the hydrogen removal catalyst is 1 to 50.
[0022] Furthermore, the width of the inner frame is 1-10mm.
[0023] In the technical solution, if the width of the inner frame is too small, the circumferential end of the gas diffusion layer will be too narrow when connected to the inner frame, making it easy to deform during the extrusion process, thus affecting the performance of the membrane electrode.
[0024] Furthermore, the anode catalyst layer includes an oxygen evolution catalyst and a resin; the oxygen evolution catalyst includes at least one of iridium black, iridium oxide, supported iridium oxide, alloy catalyst, and non-precious metal catalyst; the resin includes at least one of perfluorosulfonic acid resin, partially fluorinated sulfonic acid resin, non-fluorinated sulfonic acid resin, and hydrocarbon resin; the mass ratio of the resin to the oxygen evolution catalyst is 0.05-1.5.
[0025] Furthermore, the cathode catalyst layer comprises a hydrogen evolution catalyst and a resin; the hydrogen evolution catalyst comprises at least one of carbon-supported platinum, an alloy-type supported catalyst, and a non-precious metal supported catalyst; the resin comprises at least one of perfluorosulfonic acid resin, partially fluorinated sulfonic acid resin, non-fluorinated sulfonic acid resin, and hydrocarbon resin; the mass ratio of the resin to the hydrogen evolution catalyst support is 0.1-1.5.
[0026] Furthermore, the proton exchange membrane is one of a perfluorosulfonic acid membrane, a partially fluorinated sulfonic acid membrane, a non-fluorinated sulfonic acid membrane, and a hydrocarbon membrane; the proton exchange membrane can be an enhanced membrane or a homogenized membrane.
[0027] Furthermore, the cathode gas diffusion layer is one of titanium felt, sintered titanium plate, porous titanium plate, carbon paper, and carbon cloth; the cathode gas diffusion layer is one of not undergoing hydrophobic treatment and undergoing hydrophilic treatment; the hydrophilic treatment includes at least one of surface hydrophilic coating, chemical oxidation treatment, plasma treatment, composite modified materials, biomass-derived coating, and heat treatment.
[0028] Furthermore, the ratio of the thickness of the inner frame of the anode sealing frame to the swelling thickness of the proton exchange membrane is 0.4-1, and the swelling thickness of the proton exchange membrane is the product of the thickness of the proton exchange membrane and the swelling rate at the operating temperature.
[0029] Another objective of this invention is to provide the application of any of the above-described membrane electrode structures in the preparation of a water electrolysis hydrogen production device.
[0030] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The inner frame separates the catalyst coating film and the gas diffusion layer. In particular, the circumferential end of the gas diffusion layer is directly isolated from the catalyst coating film. This ensures that even if the proton exchange membrane swells, the edge of the gas diffusion layer will not come into contact with the catalyst layer on the catalyst coating film, thereby avoiding damage from sharp burrs and ensuring that the performance of the membrane electrode is not affected by burrs. At the same time, it prevents the catalyst coating film from being damaged, which would cause hydrogen to flow from the cathode to the anode and cause hydrogen and oxygen to mix, thus improving safety.
[0031] (2) In order to avoid the damage of the catalyst coating film by the burrs of the gas diffusion layer, this utility model takes into account the effect of film swelling and sets an appropriate thickness for the inner frame, further avoiding the film being squeezed and damaged, improving the stability of the membrane electrode operation, and ensuring the performance of the membrane electrode. Attached Figure Description
[0032] Figure 1 This is a three-dimensional structural view of the cathode sealing frame of this utility model.
[0033] Figure 2 This is a cross-sectional view of the cathode sealing frame of this utility model.
[0034] Figure 3 This is a structural diagram of the membrane electrode of this utility model.
[0035] Figure 4 The graph shows the electrolysis performance test results for Examples 1 and 2.
[0036] Figure 5 The graph shows the test results of hydrogen concentration in anodic oxygen under voltage fluctuation conditions for Example 1, Comparative Example 1, and Comparative Example 2.
[0037] Figure 6The graph shows the test results of hydrogen concentration in anodic oxygen under voltage fluctuation conditions for Examples 1, 3, and Comparative Examples 3-5.
[0038] Reference numerals: Cathode sealing frame 100, Anode sealing frame 200, Catalyst coating film 300, Anode catalyst layer 310, Proton exchange membrane 320, Cathode catalyst layer 330, Cathode diffusion layer 400, Anode diffusion layer 500, Outer frame 600, Inner frame 700, Hydrogen removal layer 800. Detailed Implementation
[0039] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0040] Example 1 Combination Figures 1 to 3 This embodiment provides a membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen, including a cathode sealing frame 100, an anode sealing frame 200, a catalyst coating membrane 300, a cathode gas diffusion layer 400, and an anode gas diffusion layer 500. The catalyst coating membrane 300 is formed by coating both sides of a proton exchange membrane 320 with catalyst layers. One side of the proton exchange membrane 320 is coated with a cathode catalyst layer 330, and the other side is coated with an anode catalyst layer 310. The cathode sealing frame 100 is connected to the cathode catalyst layer 330, and the cathode gas diffusion layer 400 is connected to the cathode sealing frame 100. Similarly, the anode sealing frame 200 is connected to the anode catalyst layer 310, and the anode gas diffusion layer 500 is connected to the anode sealing frame 200.
[0041] Both the cathode sealing frame 100 and the anode sealing frame 200 include an outer frame 600 and an inner frame 700. The inner frame 700 is circumferentially connected to the inner wall of the outer frame 600 and forms a stepped structure with the outer frame 600. The bottom surface of the outer frame 600 is flush with the bottom surface of the inner frame 700. The bottom surfaces of the inner frame 700 and the outer frame 600 are connected to a catalyst coating film 300. The top surface of the inner frame 700 of the cathode sealing frame 100 is connected to a cathode gas diffusion layer 400. The top surface of the inner frame 700 of the anode sealing frame 200 is connected to an anode gas diffusion layer 500. The thickness of the inner frame 700 is 0.01~0.15mm.
[0042] In this embodiment, the inner frame 700 of the anode and cathode sealing frame 200 has a thickness of 0.045 mm and a width of 5 mm. The thickness difference between the inner and outer frames 600 of the anode sealing frame 200 is 0.4 mm, and the thickness difference between the inner and outer frames 600 of the cathode sealing frame 100 is 0.275 mm. Both the cathode sealing frame 100 and the anode sealing frame 200 are made of PPS, and the gas diffusion layer and the catalyst coating film 300 are bonded to the sealing frames with epoxy resin adhesive.
[0043] The sides of the gas diffusion layers of the anode and cathode are in close contact with the inner wall of the outer frame 600. The anode gas diffusion layer 500 is made of titanium felt with a thickness of 0.4 mm. The cathode gas diffusion layer 400 is made of carbon paper with a thickness of 0.3 mm, and is hydrophilically treated using plasma.
[0044] The oxygen evolution catalyst in the anode catalyst layer 310 is iridium oxide, and the resin is perfluorosulfonic acid resin, with a resin-to-oxygen evolution catalyst ratio of 0.5. The proton exchange membrane 320 is a perfluorosulfonic acid membrane with a thickness of 80 µm, and the membrane's swelling ratio in the Z-axis direction at the test temperature is 81.25%. Here, the Z-axis direction refers to the thickness direction. The hydrogen evolution catalyst in the cathode catalyst layer 330 is carbon-supported platinum, and the resin is perfluorosulfonic acid resin, with a resin-to-hydrogen evolution catalyst support ratio of 0.6.
[0045] Furthermore, a hydrogen removal layer 800 is provided between the anode catalyst layer 310 and the proton exchange membrane 320. The hydrogen removal catalyst in the anode hydrogen removal layer 800 is carbon-supported platinum, and the resin is perfluorosulfonic acid resin, with a resin-to-hydrogen removal catalyst ratio of 30.
[0046] The above-mentioned membrane electrode preparation method is as follows: the anode hydrogen elimination layer 800 is coated onto the proton exchange membrane 320 by slit coating; the cathode and anode catalyst layers 310 are coated onto both sides of the proton exchange membrane 320 by slit coating, with the anode catalyst layer 310 located on the surface of the anode hydrogen elimination layer 800 and the cathode catalyst layer 330 located on the surface of the proton exchange membrane 320; the cathode sealing frame 100 and the anode sealing frame 200 are respectively attached to the cathode and anode catalyst layers 310; and the cathode and anode gas diffusion layers 500 are respectively attached to the top surface of the inner frame 700 of the cathode and anode sealing frame 200.
[0047] Example 2 This embodiment provides a membrane electrode structure, which differs from Embodiment 1 in that: the thickness difference between the inner frame 700 and the outer frame 600 of the anode sealing frame 200 is 0.25 mm; and the thickness of the anode gas diffusion layer 500 is 0.25 mm.
[0048] Example 3 This embodiment provides a membrane electrode structure, which differs from Embodiment 1 in that: the thickness difference between the outer frame 600 and the inner frame 700 of the cathode sealing frame 100 is 0.175 mm; and the thickness of the cathode gas diffusion layer 400 is 0.2 mm.
[0049] Comparative Example 1 This comparative example provides a membrane electrode structure, which differs from Example 1 in that the thickness difference between the outer frame 600 and the inner frame 700 of the anode sealing frame 200 is 0.35 mm.
[0050] Comparative Example 2 This comparative example provides a membrane electrode structure, which differs from Example 1 in that the thickness difference between the outer frame 600 and the inner frame 700 of the cathode sealing frame 100 is 0.225 mm.
[0051] Comparative Example 3 This comparative example provides a membrane electrode structure, which differs from Example 1 in that: the thickness difference between the outer frame 600 and the inner frame 700 of the anode sealing frame 200 is 1.1 mm; and the thickness of the anode gas diffusion layer 500 is 1.1 mm.
[0052] Comparative Example 4 This comparative example provides a membrane electrode structure, which differs from Example 1 in that: the thickness of the cathode gas diffusion layer 400 is 3.2 mm; and the thickness difference between the outer frame 600 and the inner frame 700 of the cathode sealing frame 100 is 3.175 mm.
[0053] Comparative Example 5 This comparative example provides a membrane electrode structure, which differs from Example 1 in that PTFE is added to the cathode gas diffusion layer 400 for hydrophobic treatment, wherein the PTFE content is 10wt%.
[0054] The membrane electrodes of Examples 1 and 2 were tested for their water electrolysis performance, and the results are as follows: Figure 4 As shown. The preferred gas diffusion layer thickness in Example 2 gives it better water electrolysis performance.
[0055] The hydrogen concentration in the anolyte of the membrane electrodes from Examples 1, 3, and Comparative Examples 1-5 was tested under voltage fluctuation conditions. The voltage fluctuation was achieved by a square wave load reduction method: constant voltage for 0V for 30s, constant voltage for 1.8V for 30s, constant voltage for 0V for 30s, constant voltage for 1.8V for 30s, and so on. The results are as follows: Figure 5 and Figure 6 As shown.
[0056] The hydrogen content in oxygen in Example 1 is lower than that in Comparative Example 1, indicating that the thickness difference between the outer and inner frames of the anode sealing frame is the same as the thickness of the anode gas diffusion layer, which can prevent the catalyst coating film from being damaged.
[0057] The hydrogen content in the oxygen in Example 1 is lower than that in Comparative Example 2, indicating that the thickness setting that does not meet the thickness calculation formula of each structure of this utility model may lead to damage to the catalyst coating film.
[0058] The hydrogen content in oxygen in Examples 1 and 3 was lower than that in Comparative Example 3, indicating that an excessively thick anolyte gas diffusion layer would increase mass transfer resistance and increase the accumulation of hydrogen on the anode side, thereby leading to an increase in the hydrogen content in oxygen.
[0059] The hydrogen content in oxygen in Examples 1 and 3 is lower than that in Comparative Example 4. In Example 3, the cathode gas diffusion layer of appropriate thickness constructs a good water-gas transport channel, reduces mass transfer resistance, and allows both hydrogen gas and hydrogen dissolved in water to be discharged to the cathode flow field through the cathode gas diffusion layer, thereby reducing the permeation of cathode hydrogen to the anode and thus reducing the hydrogen content in the anode oxygen.
[0060] The hydrogen content in oxygen in Examples 1 and 3 was lower than that in Comparative Example 5. The hydrophobic cathode gas diffusion layer allowed more hydrogen dissolved in water to permeate into the anode, resulting in an increase in the hydrogen content in oxygen.
[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen, comprising a cathode sealing frame, an anode sealing frame, a catalyst-coated membrane, a cathode gas diffusion layer, and an anode gas diffusion layer, wherein the catalyst-coated membrane is formed by coating both sides of the proton exchange membrane with catalyst layers, characterized in that, Both the cathode sealing frame and the anode sealing frame include an outer frame and an inner frame, with the inner frame circumferentially connected to the inner wall of the outer frame. The outer frame forms a stepped structure, with the bottom surface of the outer frame and the bottom surface of the inner frame being flush; the bottom surfaces of the inner frame and the outer frame are connected to a catalyst coating film, the top surface of the inner frame of the cathode sealing frame is connected to a cathode gas diffusion layer, and the top surface of the inner frame of the anode sealing frame is connected to an anode gas diffusion layer. The thickness of the inner frame is 0.01~0.15mm.
2. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to claim 1, characterized in that, The thickness of the inner frame of the cathode sealing frame is a, the thickness of the inner frame of the anode sealing frame is b, the thickness of the proton exchange membrane is c, its swelling ratio is k, the thickness difference between the outer and inner frames of the cathode sealing frame is d, and the thickness of the cathode gas diffusion layer is e. Then a + b = c × k + (ed).
3. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to claim 1, characterized in that, The material of the anode gas diffusion layer is one of titanium felt, sintered titanium plate, and porous titanium plate; the thickness difference between the outer frame and the inner frame of the anode sealing frame is the same as the thickness of the anode gas diffusion layer.
4. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to claim 1, characterized in that, The thickness difference between the outer and inner frames of the anode sealing frame is 0.1-1 mm; the thickness difference between the outer and inner frames of the cathode sealing frame is 0.1-3 mm.
5. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to claim 1, characterized in that, The thickness of the anode gas diffusion layer is 0.1~1mm; the thickness of the cathode gas diffusion layer is 0.1-3mm.
6. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to claim 1, characterized in that, The inner frame thickness of the anode sealing frame is the same as the inner frame thickness of the cathode sealing frame.
7. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to claim 1, characterized in that, The width of the inner frame is 1~10mm.
8. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to claim 1, characterized in that, The cathode sealing frame and anode sealing frame are made of PEN, PPS or PTFE.
9. The membrane electrode structure for proton exchange membrane electrolysis of water to produce hydrogen according to any one of claims 1 to 8, characterized in that, A cathode catalytic layer is coated on one side of the proton exchange membrane, and an anode catalytic layer is coated on the other side. A hydrogen removal layer is provided between the anode catalytic layer and the proton exchange membrane.