Anode catalyst layer slurry, method for preparing the same, and use thereof

Abstract

The application provides an anode catalyst layer slurry, a preparation method and application thereof, and the anode catalyst layer slurry comprises hydrophilic silica particles, a catalyst, an ionomer and a solvent; the powder contact angle of the hydrophilic silica and water is 10-70 degrees, and the particle size of the hydrophilic silica particles is 5-50 nm. The hydrophilic silica particles with the above properties have better compatibility with other components of the anode catalyst layer slurry, and a uniform anode catalyst layer can be prepared, so that the performance of the anode catalyst layer can be fully exerted. The anode catalyst layer has better water management capability, and the water generated in the catalytic reaction process of the battery is not easy to accumulate on the surface of the anode catalyst layer, and hydrogen is easy to mass transfer, so that the anode water flooding effect is effectively improved, and meanwhile, the structure of the anode catalyst layer is not damaged, and the performance exertion of the fuel cell is affected.

Description

Technical Field

[0001] This invention relates to the field of fuel cells, and more specifically, to an anode catalyst layer slurry, its preparation method, and its application. Background Technology

[0002] The membrane electrode assembly (MEA) is the core unit of a proton exchange membrane fuel cell, and the anode and cathode catalyst layers are the core parts of the MEA. The catalyst layer is not only the site of electrochemical reactions, but also provides transport channels for protons, electrons, reactant gases and water. Its structure plays a decisive role in the performance and lifespan of the MEA.

[0003] Currently, proton exchange membrane (PEM) fuel cells used in vehicles often experience anode flooding after prolonged operation. This further hinders the delivery of hydrogen to the anode side, leading to insufficient hydrogen supply in the battery. Consequently, the performance of the fuel cell deteriorates significantly, resulting in severely insufficient output power and impacting the user experience.

[0004] To mitigate anode flooding, existing technologies often employ system control strategies or modified anode-side flow field designs. System control strategies, such as battery voltage and exhaust gas monitoring and anode-side flushing, can eliminate accumulated nitrogen or water in the battery, but they can cause irreversible damage to the anode catalyst layer structure, thus affecting fuel cell performance. Modified anode-side flow field designs can improve anode-side drainage capacity to some extent, but the improvement is often unsatisfactory and cannot fundamentally solve the anode flooding problem.

[0005] Therefore, the present invention needs to provide a new anode catalyst layer slurry and its preparation method to solve the problems existing in the prior art when improving anode flooding, such as poor anode flooding improvement effect or damage to anode catalyst layer structure. Summary of the Invention

[0006] The main objective of this invention is to provide an anode catalyst slurry, its preparation method, and its application, in order to solve the problems existing in the prior art that exist when improving anode flooding, such as poor anode flooding improvement effect or damage to the anode catalyst layer structure.

[0007] To achieve the above objectives, according to one aspect of the present invention, an anode catalyst layer slurry is provided, comprising hydrophilic silica particles, a catalyst, an ionomer, and a solvent; the powder contact angle between the hydrophilic silica and water is 10° to 70°, and the particle size of the hydrophilic silica particles is 5 to 50 nm.

[0008] Furthermore, by weight percentage, the anode catalyst layer slurry comprises 1–20 wt% hydrophilic silica particles, 1–20 wt% catalyst, 2–20 wt% ionomer and 40–80 wt% solvent.

[0009] Furthermore, the anode catalyst slurry comprises 2–10 wt% hydrophilic silica particles, 5–15 wt% catalyst, 2–15 wt% ionomer and 60–80 wt% solvent.

[0010] Furthermore, the specific surface area of ​​the hydrophilic silica particles is 200–450 m². 2 / g, the purity of the hydrophilic silica particles is greater than 99.9%.

[0011] Furthermore, the catalyst contains Pt element, and preferably the catalyst is selected from one or more of Pt, Pt-alloy or Pt / C.

[0012] Furthermore, the ionomer is selected from perfluorosulfonic acid resins.

[0013] Furthermore, the solvent is selected from water and / or alcohol solvents.

[0014] Furthermore, the alcohol solvent is selected from one or more of methanol, ethanol, ethylene glycol, n-propanol, isopropanol, or glycerol.

[0015] Furthermore, the Pt element content in the catalyst is 20–100 wt%.

[0016] According to one aspect of the present invention, a method for preparing an anode catalyst layer slurry is provided, comprising: mixing hydrophilic silica particles, a catalyst, an ionomer and a solvent and then subjecting the mixture to high-pressure homogeneous dispersion to obtain the anode catalyst layer slurry.

[0017] Furthermore, the pressure for high-pressure homogeneous dispersion is 100–150 MPa.

[0018] Furthermore, the high-pressure homogenization dispersion is performed 2 to 5 times.

[0019] Furthermore, prior to high-pressure homogenization, the preparation method also includes a step of stirring a mixture of hydrophilic silica particles, catalyst, ionomer, and solvent.

[0020] Furthermore, the stirring speed is 500–800 rpm, and the stirring time is 1–12 h.

[0021] Furthermore, the preparation method also includes first mixing the catalyst with the first part of the solvent, then adding hydrophilic silica particles to the system, continuing to add the second part of the solvent to the system and stirring, and adding ionomers during the stirring process.

[0022] According to another aspect of the present invention, an anode catalyst layer for a proton exchange membrane is also provided, which is obtained by coating and transferring the aforementioned anode catalyst layer slurry.

[0023] Applying the technical solution of this invention, silica particles are added to the anode catalyst slurry. These particles are hydrophilic, with a powder contact angle with water ranging from 10° to 70°. When the powder contact angle between the hydrophilic silica particles and water is too high, the anode catalyst layer's ability to bind water is insufficient, failing to improve the uniform distribution of water under high electrode density, leading to localized water blockage in the flow channels and severely affecting membrane electrode performance. When the powder contact angle between the hydrophilic silica particles and water is too low, the catalyst layer will bind a large amount of liquid water, preventing water drainage and hindering the delivery of reactant gases to the catalyst surface, severely impacting membrane electrode performance. When the powder contact angle between the hydrophilic silica and water is 10° to 70°, a thin layer of water can be adsorbed on the surface of the anode catalyst layer. This greatly improves the water distribution in the anode catalyst layer, reduces the likelihood of clogging gas flow channels, facilitates drainage, and further improves battery performance (also applicable to high-density batteries), such as increasing output power. Meanwhile, the hydrophilic silica particles of this invention have a particle size of 5-50 nm, exhibiting excellent dispersion performance in the anode catalyst layer slurry, resulting in superior material performance uniformity. Furthermore, the introduction of hydrophilic silica particles into the anode catalyst layer does not negatively impact the battery's electrical performance, nor does it damage the anode catalyst layer structure, thus ensuring unaffected fuel cell performance. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0025] As described in the background section of this application, existing technologies for improving anode flooding suffer from problems such as poor anode flooding improvement or damage to the anode catalyst layer structure. To address this issue, this application provides an anode catalyst layer slurry comprising hydrophilic silica particles, a catalyst, an ionomer, and a solvent; the hydrophilic silica particles have a powder contact angle of 10° to 70° with water, and the particle size of the hydrophilic silica particles is 5 to 50 nm.

[0026] This invention incorporates silica particles into the anode catalyst slurry. These particles are hydrophilic, with a powder contact angle with water ranging from 10° to 70°. When the contact angle is too high, the anode catalyst layer lacks sufficient water-binding capacity, hindering the uniform distribution of water under high dielectric density and leading to localized water blockage in the flow channels, severely impacting membrane electrode performance. Conversely, when the contact angle is too low, the catalyst layer binds a large amount of liquid water, preventing water drainage and hindering the delivery of reactant gases to the catalyst surface, further affecting membrane electrode performance. The applicant has discovered that when the contact angle between the hydrophilic silica and water is 10° to 70°, a thin layer of water can be adsorbed on the anode catalyst layer surface. This significantly improves water distribution within the anode catalyst layer, reduces the likelihood of gas channel blockage, facilitates drainage, and further enhances battery performance (including high-density batteries), such as increasing output power. Meanwhile, the hydrophilic silica particles of this invention have a particle size of 5-50 nm, exhibiting excellent dispersion performance in the anode catalyst layer slurry, resulting in superior material performance uniformity. Furthermore, the introduction of hydrophilic silica particles into the anode catalyst layer does not negatively impact the battery's electrical performance, nor does it damage the anode catalyst layer structure, thus ensuring unaffected fuel cell performance.

[0027] In summary, hydrophilic silica particles with the aforementioned properties exhibit good compatibility with other components of the anode catalyst slurry, enabling the preparation of a uniform anode catalyst layer. The synergistic effect among the components in the anode catalyst layer allows its performance to be fully realized. It possesses superior water management capabilities; water generated during the catalytic reaction does not easily accumulate on the surface of the anode catalyst layer, hydrogen mass transfer is facilitated, effectively improving the anode flooding effect without damaging the anode catalyst layer structure, thus not affecting the fuel cell's performance.

[0028] To further improve the anodic flooding effect, the contact angle between the hydrophilic silica particles and water is 30° to 60°, and the particle size of the hydrophilic silica particles is 5 to 15 nm.

[0029] In a preferred embodiment, the anode catalyst layer slurry comprises, by weight percentage, 1-20 wt% hydrophilic silica particles, 1-20 wt% catalyst, 2-20 wt% ionomer, and 40-80 wt% solvent. By controlling the components of the anode catalyst layer slurry to the above-mentioned proportions, this invention allows the anode catalyst layer slurry to achieve a suitable solid content (5-20 wt%), which is beneficial for subsequent coating to obtain a uniform, stable, and high-performance anode catalyst layer. This results in better water management capabilities for the anode catalyst layer, further improving the anode flooding problem. The anode catalyst layer also exhibits stronger drainage capacity and faster gas mass transfer, which is beneficial for subsequent application in batteries with superior output power.

[0030] The present invention controls the weight of hydrophilic silica particles in the anode catalyst layer slurry to be between 1 and 20 wt% based on the following considerations: when the weight of hydrophilic silica particles in the anode catalyst layer slurry is too high, it will increase the body resistance and contact resistance on the anode side, resulting in a decrease in membrane electrical output power; when the weight of hydrophilic silica particles in the anode catalyst layer slurry is too low, it will weaken the ability of the anode coating to bind water, making it impossible to uniformly distribute liquid water on the anode side, thus affecting the hydrogen transport efficiency.

[0031] To further improve the anode flooding effect, the anode catalyst layer slurry includes 2-10 wt% hydrophilic silica particles, 5-15 wt% catalyst, 2-15 wt% ionomer and 60-80 wt% solvent.

[0032] To further improve the anodic flooding effect, the specific surface area of ​​the hydrophilic silica particles is 200–450 m². 2 / g (e.g., preferably 200m) 2 / g、220m 2 / g、250m 2 / g、280m 2 / g、300m 2 / g、320m 2 / g, 350m 2 / g, 350m 2 / g、380m 2 / g、400m 2 / g、420m 2 / g and 450m 2 / g), the purity of the hydrophilic silica particles is greater than 99.9%.

[0033] This invention limits the specific surface area of ​​hydrophilic silica particles to 200–450 m². 2 At a specific surface area of ​​ / g, hydrophilic silica particles can promote the adsorption of a thin water layer on the surface of the anode catalyst layer. If the specific surface area is too high, exceeding 450m², ... 2 When the specific surface area is less than 200 m² / g, it easily leads to the binding of a large amount of liquid water in the catalyst layer, preventing water from being removed and hindering the transport of reactant gases to the catalyst surface, severely affecting the performance of the membrane electrode. 2 At a specific surface area of ​​ / g, the anode catalyst layer's ability to bind water is low, failing to improve the uniform distribution of water under high electrical density, leading to localized flooding and affecting membrane electrode performance. By limiting the specific surface area of ​​hydrophilic silica particles to the above range, the hydrophilic silica particles can further improve the water distribution in the anode catalyst layer, are less likely to clog gas channels, facilitate drainage, and further improve battery performance.

[0034] To further improve the catalytic efficiency of the anode catalyst layer, the catalyst contains Pt element. Preferably, the catalyst is selected from one or more of Pt, Pt-alloy or Pt / C. More preferably, the Pt element content in the catalyst is 20-100 wt%.

[0035] In one alternative embodiment, the ionomer may be selected from perfluorosulfonic acid resins, but is not limited to the above-mentioned ionomer types; other conventional ionomers in the art may also be selected.

[0036] To further improve the stability and uniformity of the anode catalyst slurry, the solvent is selected from water and / or alcohol solvents, preferably alcohol solvents selected from one or more of methanol, ethanol, ethylene glycol, n-propanol, isopropanol or glycerol.

[0037] In another aspect, the present invention provides a method for preparing an anode catalyst layer slurry, wherein hydrophilic silica particles, a catalyst, an ionomer and a solvent are mixed and homogenized under high pressure to obtain an anode catalyst layer slurry.

[0038] This invention involves mixing hydrophilic silica particles, a catalyst, an ionomer, and a solvent, followed by high-pressure homogeneous dispersion. This high-pressure homogeneous dispersion creates a supersonic fluid within the dispersion chamber, causing the catalyst clusters to break down through collisions and cavitation, resulting in smaller particle sizes. This process disperses micron-sized catalyst clusters into nano-sized clusters. Smaller catalyst particles lead to a more stable slurry system, more uniform component distribution, and a smoother, more defect-free anode catalyst layer. The anode catalyst layer prepared using this method fully utilizes its performance, exhibiting superior water management capabilities, facilitating drainage and gas mass transfer, and effectively solving the problem of anode flooding.

[0039] To obtain a more stable and uniform anode catalyst slurry, the ionomer is added in the form of an ionomer solution, preferably with a weight fraction of 2 to 40 wt% in the ionomer solution.

[0040] To obtain a more stable and uniform anode catalyst slurry, in some optional embodiments, the pressure of high-pressure homogenization dispersion is preferably 100-150 MPa (e.g., preferably 100 MPa, 120 MPa, 140 MPa, 150 MPa); the number of high-pressure homogenization dispersions is preferably 2-5 times; the preparation method of the catalyst slurry further includes a step of stirring a mixture of hydrophilic silica particles, catalyst, ionomer and solvent; preferably, the stirring speed is 500-800 rpm (e.g., preferably 500 rpm, 550 rpm, 600 rpm, 650 rpm, 700 rpm, 750 rpm, 800 rpm), and the stirring time is 1-12 h.

[0041] In a preferred embodiment, the method for preparing the anode catalyst slurry further includes first mixing the catalyst with a first portion of solvent, then adding hydrophilic silica particles to the system, continuing to add a second portion of solvent to the system and stirring, and adding ionomers during the stirring process.

[0042] To further improve the uniformity and stability of the anode catalyst slurry, this invention divides the solvent into two parts and adds them in two stages. First, the catalyst is mixed evenly with part of the solvent, and then hydrophilic silica particles are added to disperse the solid particles in the solvent. Then, the remaining solvent is added to the slurry system and stirred. An ionomer is added simultaneously with the stirring; this additional solvent helps disperse the solid particles within the ionomer and prevents the particles from agglomerating due to excessive viscosity. Adding the anode catalyst slurry in this order results in better dispersion of the solid particles, reducing the likelihood of agglomeration. This leads to better coating during the subsequent preparation of the anode catalyst layer, resulting in a smoother, flatter, and defect-free anode catalyst layer.

[0043] In one optional embodiment, when the solvent is selected from water and alcohol solvents, the catalyst can be mixed evenly with water first, and then hydrophilic silica particles can be added. Then, alcohol solvent can be added to the system and stirred and mixed. Ionomers can be added while stirring.

[0044] Another aspect of the present invention provides an anode catalyst layer for a proton exchange membrane, which is obtained by coating and transferring the anode catalyst layer slurry of the present invention.

[0045] Based on the reasons mentioned above, the anode catalyst layer for proton exchange membranes prepared by this invention has excellent water management capabilities. Water generated during the catalytic reaction of the battery does not easily accumulate on the surface of the anode catalyst layer, and hydrogen is easily transferred, effectively improving the anode flooding effect and not damaging the anode catalyst layer structure, thus not affecting the performance of the fuel cell.

[0046] In one optional embodiment, the method for preparing an anode catalyst layer for a proton exchange membrane includes: coating an anode catalyst layer slurry onto one side surface of a base membrane, drying it to obtain a transfer membrane, and transferring the anode catalyst layer of the transfer membrane to one side of the proton exchange membrane using a thermal transfer process, so as to form an anode catalyst layer for a proton exchange membrane on one side of the proton exchange membrane.

[0047] To better solidify the anode catalyst layer for the proton exchange membrane, preferably, the drying temperature is 60–80°C and the drying time is 2–10 min.

[0048] To improve the transfer efficiency of the anodic catalyst layer of the transfer film, preferably, the transfer temperature is 130-180℃, the transfer pressure is 6-10 kgf, and the hot pressing time during the transfer process is 1-3 min.

[0049] To further improve membrane electrode performance, the Pt loading of the anode catalyst layer for proton exchange membranes is 0.05–0.1 mg / cm³. 2 The loading of hydrophilic silica particles in the anode catalyst layer is 0.01–0.1 mg / cm³. 2 .

[0050] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0051] Example 1

[0052] The anode catalyst layer slurry consists of 3 wt% hydrophilic silica particles (with a water contact angle of 50°, a particle size of 9 nm, and a specific surface area of ​​380 m²). 2 The composition consists of 8 wt% Pt / C (Pt content is 50 wt%), 30 wt% water, 43 wt% n-propanol and 16 wt% perfluorosulfonic acid resin solution (perfluorosulfonic acid resin content is 20 wt%).

[0053] Preparation method of anode catalyst layer slurry: Prepare hydrophilic silica particles, Pt / C, water, n-propanol and perfluorosulfonic acid resin solution according to the above formula of anode catalyst layer slurry; first mix Pt / C with water, then add hydrophilic silica particles, then add n-propanol and stir. During the stirring process, add perfluorosulfonic acid resin solution. The stirring speed is 700 rpm and the stirring time is 2 hours. After stirring and mixing, the mixture is subjected to high-pressure homogenization dispersion 3 times (pressure is 120 MPa) to obtain anode catalyst layer slurry.

[0054] Example 2

[0055] The difference from Example 1 is that the anode catalyst layer slurry consists of 20 wt% hydrophilic silica particles (with a water contact angle of 50°, a particle size of 9 nm, and a specific surface area of ​​380 m²). 2 The solution consists of 8 wt% Pt / C (Pt content is 50 wt%), 20 wt% water, 40 wt% n-propanol, and 12 wt% perfluorosulfonic acid resin solution (perfluorosulfonic acid resin content is 20 wt%).

[0056] Example 3

[0057] The difference from Example 1 is that the anode catalyst layer slurry consists of 10 wt% hydrophilic silica particles (with a water contact angle of 50°, a particle size of 9 nm, and a specific surface area of ​​380 m²). 2The solution consists of 8 wt% Pt / C (Pt content is 50 wt%), 30 wt% water, 40 wt% n-propanol, and 12 wt% perfluorosulfonic acid resin solution (perfluorosulfonic acid resin content is 20 wt%).

[0058] Example 4

[0059] The difference from Example 1 is that the contact angle between the hydrophilic silica particles and the water powder is 10°.

[0060] Example 5

[0061] The difference from Example 1 is that the contact angle between the hydrophilic silica particles and the water powder is 70°.

[0062] Example 6

[0063] The difference from Example 1 is that the hydrophilic silica particles have a particle size of 50 nm.

[0064] Example 7

[0065] The difference from Example 1 is that the hydrophilic silica particles have a particle size of 5 nm.

[0066] Example 8

[0067] The difference from Example 1 is that the preparation method of the anode catalyst layer slurry does not include high-pressure homogenization dispersion treatment.

[0068] Comparative Example 1

[0069] The only difference from implementation 1 is that the anode catalyst slurry does not include hydrophilic silica particles.

[0070] The anode catalyst slurry in this comparative example consists of 8 wt% Pt / C catalyst (Pt content is 50 wt%), 33 wt% water, 43 wt% n-propanol, and 16 wt% perfluorosulfonic acid resin solution (perfluorosulfonic acid resin content is 20%). The anode catalyst slurry was prepared using the same preparation method as in Example 1.

[0071] Performance testing

[0072] Preparation of fuel cell membrane electrode: The anode catalyst layer slurry and cathode catalyst layer slurry of the above examples and comparative examples were coated on the surfaces of the first base membrane and the second base membrane, respectively. After drying at 70°C for 5 min, a transfer membrane containing the anode catalyst layer and a transfer membrane containing the cathode catalyst layer were obtained. The anode catalyst layer and the cathode catalyst layer were transferred to both sides of the proton exchange membrane using thermal transfer technology (transfer temperature of 150°C, transfer pressure of 8 kgf, and hot pressing time of 1 min), respectively. Then, the membrane electrode was encapsulated with a frame (encapsulation temperature of 160°C, pressure of 12 kgf, and hot pressing time of 1 min) to obtain the fuel cell membrane electrode.

[0073] The cathode catalyst slurry consists of 8 wt% Pt / C (Pt content is 50 wt%), 30 wt% water, 42 wt% n-propanol and 20 wt% perfluorosulfonic acid resin solution (perfluorosulfonic acid resin content is 20%).

[0074] The membrane electrodes prepared in the above examples and comparative examples were subjected to single-cell polarization tests: hydrogen gas was passed through the anode at a stoichiometric ratio of 1.5, and air was passed through the cathode at a stoichiometric ratio of 1.5; the operating temperature was 70°C; the humidity of both the anode and cathode was 40%; and the back pressure of both the anode and cathode was 250 kPa. The test results are shown in Table 1.

[0075] Table 1

[0076]

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An anode catalyst layer slurry, characterized in that, By weight percentage, the anode catalyst slurry comprises 1-20 wt% hydrophilic silica particles, 1-20 wt% catalyst, 2-20 wt% ionomer, and 40-80 wt% solvent; the hydrophilic silica has a powder contact angle with water of 10°-70°, the hydrophilic silica particles have a particle size of 5-50 nm, and the specific surface area of ​​the hydrophilic silica particles is 200-450 m². 2 / g; The hydrophilic silica particles, the catalyst, the ionomer, and the solvent are mixed and homogenized under high pressure to obtain the anode catalyst layer slurry.

2. The anode catalyst layer slurry according to claim 1, characterized in that, The anode catalyst slurry comprises, by weight percentage, 2-10 wt% of the hydrophilic silica particles, 5-15 wt% of the catalyst, 2-15 wt% of the ionomer and 60-80 wt% of the solvent.

3. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, The purity of the hydrophilic silica particles is greater than 99.9%.

4. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, The catalyst contains Pt.

5. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, The catalyst is selected from one or more of Pt, Pt-alloys, or Pt / C.

6. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, The ionomer is selected from perfluorosulfonic acid resin.

7. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, The solvent is selected from water and / or alcohol solvents.

8. The anode catalyst layer slurry according to claim 7, characterized in that, The alcohol solvent is selected from one or more of methanol, ethanol, ethylene glycol, n-propanol, isopropanol, or glycerol.

9. The anode catalyst layer slurry according to claim 4, characterized in that, The catalyst contains 20-100 wt% Pt.

10. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, The pressure of the high-pressure homogeneous dispersion is 100~150MPa.

11. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, The high-pressure homogenization dispersion is performed 2 to 5 times.

12. The anode catalyst layer slurry according to claim 1 or 2, characterized in that, Before the high-pressure homogenization, the mixture of the hydrophilic silica particles, the catalyst, the ionomer and the solvent is stirred.

13. The anode catalyst layer slurry according to claim 12, characterized in that, The stirring speed is 500~800 rpm, and the stirring time is 1~12 hours.

14. The anode catalyst layer slurry according to claim 12, characterized in that, First, the catalyst is mixed with the solvent in the first part, then the hydrophilic silica particles are added to the system, and the solvent in the second part is added to the system while stirring. During the stirring process, the ionomer is added.

15. An anode catalyst layer for a proton exchange membrane, characterized in that, The anode catalyst layer is obtained by coating and transferring the anode catalyst layer slurry according to any one of claims 1 to 14.

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