High-performance membrane electrode based on platinum-carbon catalyst and preparation method thereof

Abstract

The invention provides a high-performance membrane electrode based on a platinum-carbon catalyst and a preparation method of the high-performance membrane electrode, and belongs to the technical field of fuel cells. The preparation method of the high-performance membrane electrode comprises the following steps: (1) carrying out plasma treatment on a platinum-carbon catalyst to obtain a surface-modified platinum-carbon catalyst; (2) mixing and dispersing the surface-modified platinum-carbon catalyst, an ionomer and a solvent to obtain electrode slurry; and (3) coating one side or two sides of a proton membrane with the electrode slurry, and performing sealing treatment to obtain the membrane electrode for the fuel cell. The platinum-carbon catalyst subjected to special treatment is combined with the sulfonated polyphenyl polymer, so that the durability and high-temperature performance of the membrane electrode are remarkably improved while high catalytic activity is maintained, and the preparation process is simple and suitable for large-scale production.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell membrane electrode material. Background Art

[0002] Proton exchange membrane fuel cells (PEMFCs) have broad application prospects in new energy vehicles and distributed power generation due to their high efficiency and environmental friendliness. As a core component of fuel cells, the performance of the membrane electrode (MEA) directly impacts the cell's output power and service life. Currently, a MEA typically consists of a proton exchange membrane, two catalytic layers, a gas diffusion layer, and a frame.

[0003] In traditional membrane electrode preparation processes, the catalytic layer usually uses platinum carbon (Pt / C) as a catalyst and Nafion resin as a polymer electrolyte. Although the Pt / C catalyst has excellent catalytic activity, during the operation of the fuel cell, the carbon carrier is susceptible to high-potential corrosion, resulting in the shedding and aggregation of platinum particles, which seriously affects the long-term stability of the membrane electrode. In addition, perfluorosulfonic acid resin is expensive and has poor environmental tolerance. At >80°C or low humidity conditions, the proton conductivity of Nafion drops sharply. The hydrophobic main chain of Nafion is weakly bonded to the interface of the carbon carrier, which can easily cause the catalytic layer to "crack";

[0004] Patent publication number CN115020725A discloses a membrane electrode preparation process using Pt2CuNi / W-SnO2 and Pt / Ti4O7 as catalysts. While this solves the problem of carbon support corrosion, the preparation process is complex and the alloy catalyst synthesis conditions are harsh. Patent publication number CN117476985A discloses a method for preparing a membrane electrode for a high-temperature proton exchange membrane fuel cell using a Pt / C catalyst with a high platinum content, but it does not address the fundamental issue of carbon support corrosion. Summary of the Invention

[0005] In response to the above problems, the present invention proposes a high-performance membrane electrode based on platinum-carbon catalyst and its preparation method. It combines a specially treated platinum-carbon catalyst with a sulfonated polyphenyl polymer, which significantly improves the durability and high-temperature performance of the membrane electrode while maintaining high catalytic activity. The preparation process is simple and suitable for large-scale production.

[0006] In order to achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A high-performance membrane electrode based on a platinum-carbon catalyst, the preparation method comprising the following steps:

[0008] (1) Platinum-carbon catalyst is subjected to plasma treatment to obtain a surface-modified platinum-carbon catalyst;

[0009] (2) mixing and dispersing the surface-modified platinum-carbon catalyst, ionomer, and solvent to obtain an electrode slurry;

[0010] (3) The electrode slurry is coated on one side or both sides of the proton membrane, and after sealing treatment, a membrane electrode for a fuel cell is obtained.

[0011] The plasma treatment is oxygen plasma treatment, and the atmosphere is an argon / oxygen mixed atmosphere; the volume ratio of the argon / oxygen mixed atmosphere is (3-5):1; the treatment power is 100-300W, and the treatment time is 10-30 minutes.

[0012] The structural formula of the sulfonated polyphenyl ionomer is:

[0013] Wherein m:n is 1:(1-99).

[0014] Preferably, the sulfonation degree of the sulfonated polyphenyl polymer is 60-80% and the molecular weight is 50,000-100,000.

[0015] Preferably, the sulfonated polyphenyl ionomer can be dispersed in a low-boiling alcohol to obtain an ionomer dispersion, and the platinum-carbon catalyst is mixed with the ionomer dispersion to prepare the electrode slurry.

[0016] The low boiling point alcohol is any one or more of ethanol, n-propanol and isopropanol.

[0017] The ionomer dispersion further contains water; the volume ratio of the water to the low-boiling-point alcohol is 1:0.5-2.

[0018] The concentration of the ionomer dispersion is 1-20 wt%.

[0019] The solvent comprises high-boiling-point alcohol and water, and the high-boiling-point alcohol is ethylene glycol and / or glycerol.

[0020] The mass ratio of the platinum catalyst, ionomer, high boiling point alcohol and water is (3-5):(1-2):(4-6):(2-4).

[0021] The mixing and dispersing steps are: first, stirring at a low speed of 100-300 rpm for 30-60 minutes, then dispersing at a high speed of 1000-1500 rpm for 30-60 minutes, and finally performing ultrasonic treatment for 10-20 minutes to obtain a uniform and stable electrode slurry;

[0022] Preferably, the solid content of the electrode slurry is 10-25%, and the viscosity is controlled at 500-2000 mPa·s.

[0023] The coating step comprises: coating the electrode slurry on both sides of the proton membrane by a slit coating method, with the coating thickness controlled to be 5-15 μm, and performing gradient drying after coating: pre-drying at 40-60° C. for 5-10 minutes, then drying at 80-100° C. for 10-20 minutes, and finally drying under vacuum conditions (pressure <10 kPa) for 30-60 minutes to obtain a three-in-one component (3CCM);

[0024] The steps of sealing process are:

[0025] Frame preparation and bonding: Use polyimide film as the frame material, with a thickness of 30-50 μm, and apply hot melt adhesive on both sides with a thickness of 5-10 μm. Hot press the frame and 3CCM at a temperature of 100-120°C and a pressure of 2-4 MPa for 30-60 seconds to form a five-in-one assembly (5CCM).

[0026] Gas diffusion layer bonding: hot press the gas diffusion layer (GDL) and 5CCM at a temperature of 130-150°C and a pressure of 1-3 MPa for 60-90 seconds to form a seven-in-one assembly (7CCM);

[0027] Post-treatment: The 7CCM is subjected to heat aging treatment at a temperature of 90-110°C and a relative humidity of 80-100% for 2-4 hours to obtain the final membrane electrode product.

[0028] Preferably, the thickness of the gas diffusion layer is 100-150 μm, and the porosity is 70-80%.

[0029] The thermal expansion coefficient of the polyimide film is 10-20 ppm / °C, and the tensile strength is ≥150 MPa.

[0030] Beneficial effects of the present invention:

[0031] (1) The surface of the platinum-carbon catalyst is modified by plasma treatment, and oxygen-containing functional groups are introduced on the surface of the carbon support, which enhances the binding force between the platinum particles and the carbon support, and at the same time improves the anti-oxidation and corrosion ability of the carbon support, significantly extending the service life of the membrane electrode.

[0032] (2) Using sulfonated polyphenyl polymer to replace traditional Nafion resin not only reduces the cost but also improves the high-temperature performance of the membrane electrode. Sulfonated polyphenyl polymer has better stability at high temperatures.

[0033] (3) The innovative three-stage dispersion process ensures the uniformity and stability of the catalytic layer slurry, avoids the particle agglomeration problem common in traditional dispersion methods, and improves the quality of the catalytic layer.

[0034] (4) The gradient drying process effectively prevents the catalytic layer from cracking and deformation, ensuring the structural integrity and performance stability of the catalytic layer.

[0035] (5) The optimized hot pressing process parameters ensure good bonding between the components, reduce contact resistance, and improve the overall performance of the membrane electrode. The post-processing process further stabilizes the structure and performance of the membrane electrode, improving the reliability and consistency of the product. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The sulfonated polyphenylene ionomer (SPP-PAF) in the following examples was prepared using the following steps. In addition, reference can also be made to the preparation method of Patent Publication No. CN 119859249A.

[0038] The preparation of SPP-PAF includes the following steps:

[0039] Experimental reagents

[0040] Experimental reagents such as 1,6-diiodoperfluorohexane (Aladdin), 3-chloroiodobenzene (Bidel Pharmaceuticals), 1-chloro-4-ethynylbenzene (Hiens), 1,3-diphenylacetone (Bidel Pharmaceuticals), 1,4-di(phenylethyl)benzene (Bidel Pharmaceuticals), trimethylsilyl chlorosulfonate (Wengjiang Reagent), Ni(COD)2 (Bidel Pharmaceuticals), and 2,2-bipyridine (Aladdin) were purchased and used directly. Tetrakis(triethylammonium sulfonate)bistetracyclone and 3,3'-(perfluorohexane-1,6-diyl)bis(chlorobenzene) (PAF monomer) were synthesized according to the literature [].

[0041] Synthesis of SPP monomer

[0042] Tetrakis(triethylammonium sulfonate)bistetracyclone 5 (0.500 g, 0.353 mmol), 1-chloro-4-ethynylbenzene (0.101 g, 0.741 mmol) and 8 mL of nitrobenzene were added to a 100 mL round-bottom flask and stirred until the raw materials dissolved. After reaction at 190 ° C under nitrogen protection for 18 h, the temperature was cooled to room temperature, and the reaction solution was added dropwise into a 250 mL round-bottom flask containing 70 mL of ethyl acetate. The mixture was refluxed for 4 h, and the solid product was filtered and collected. It was washed three times with boiling ethyl acetate and dried to obtain compound SPP (0.55 g, yield 91.4%) as an off-white powder.

[0043] Synthesis of SPP-PAF polymer

[0044] SPP-BAF polymer was synthesized by Ni(0)-catalyzed Ullmann coupling reaction of SPP with 3,3'-(perfluorohexane-1,6-diyl)bis(chlorobenzene) (PAF). Taking SPP-PAF-2.5 as an example, the specific steps are as follows: SPP monomer (0.408 g, 0.25 mmol), PAF monomer (0.128 g, 0.245 mmol), K2CO3 (0.042 g, 0.30 mmol), 2,2'-bipyridine (0.325 g, 2.08 mmol), anhydrous DMSO (5 mL) and toluene (10 mL) were added to a 100 mL three-necked round-bottom flask. After azeotropic reaction with water at 160°C for 2 h under nitrogen protection, the mixture was cooled to 80°C and catalyst Ni(COD)2 (0.544 g, 1.98 mmol) was added. The reaction was continued for 4 h and then cooled to room temperature. The mixture was added dropwise into 6 M HCl solution, filtered and washed three times with 6 M HCl and ultrapure water. After vacuum drying, a dark brown solid SPP-PAF-2.5 (0.389 g, yield 97.3%) was collected.

[0045] Example 1

[0046] A high-performance membrane electrode based on a platinum-carbon catalyst, the preparation method comprising the following steps:

[0047] S1. Pretreatment of platinum-carbon catalyst: 10 g of a commercial platinum-carbon catalyst (Pt / C, platinum content 50 wt%) was placed in a plasma treatment apparatus and surface treated under an argon / oxygen mixed atmosphere (volume ratio 4:1) at a treatment power of 200 W for 20 minutes to obtain a surface-modified platinum-carbon catalyst;

[0048] S2. Preparation of catalytic layer slurry: 4 g of the modified platinum carbon catalyst obtained in step S1, 1.5 g of a sulfonated polyphenyl polymer having a sulfonation degree of 70%, 5 g of ethylene glycol, and 3 g of ultrapure water were mixed, first stirred at a low speed of 200 rpm for 45 minutes, then dispersed at a high speed of 1200 rpm for 45 minutes, and finally ultrasonically treated (power 300 W, frequency 30 kHz) for 15 minutes to obtain a uniform and stable catalytic layer slurry;

[0049] S3. Preparation of the Catalytic Layer: The catalytic layer slurry was coated on both sides of a 20 μm thick perfluorosulfonic acid membrane using a slot coating method to a coating thickness of 10 μm. After coating, the membrane was subjected to gradient drying: pre-drying at 50°C for 8 minutes, then drying at 90°C for 15 minutes, and finally drying under vacuum conditions (pressure 5 kPa) for 45 minutes to obtain a three-in-one module (3CCM).

[0050] S4. Frame Preparation and Lamination: A 40 μm-thick polyimide film was used as the frame material, and 8 μm-thick hot-melt adhesive was applied to both sides. The frame and the 3 CCM were hot-pressed at 110°C and 3 MPa for 45 seconds to form a five-in-one assembly (5 CCM).

[0051] S5 gas diffusion layer bonding: The 120μm thick gas diffusion layer (porosity 75%) and 5CCM at a temperature of 140 ℃, a pressure of 2MPa hot pressing for 75 seconds to form a seven-in-one assembly (7CCM);

[0052] S6. Post-treatment: The 7CCM was subjected to a heat aging treatment at a temperature of 100° C. and a relative humidity of 90% for 3 hours to obtain the final membrane electrode product.

[0053] Example 2

[0054] A high-performance membrane electrode based on a platinum-carbon catalyst, the preparation method comprising the following steps:

[0055] S1. Pretreatment of platinum-carbon catalyst: 10 g of a commercial platinum-carbon catalyst (Pt / C, platinum content 40 wt%) was placed in a plasma treatment apparatus and surface treated under an argon / oxygen mixed atmosphere (volume ratio 3:1) at a treatment power of 100 W for 30 minutes to obtain a surface-modified platinum-carbon catalyst;

[0056] S2. Preparation of catalytic layer slurry: 3 g of the modified platinum carbon catalyst obtained in step S1, 1 g of a sulfonated polyphenyl polymer having a sulfonation degree of 60%, 4 g of glycerol, and 2 g of ultrapure water were mixed, first stirred at a low speed of 100 rpm for 60 minutes, then dispersed at a high shear speed of 1000 rpm for 60 minutes, and finally subjected to ultrasonic treatment (power 200 W, frequency 20 kHz) for 20 minutes to obtain a uniform and stable catalytic layer slurry;

[0057] S3. Preparation of the Catalytic Layer: The catalytic layer slurry was coated on both sides of a 15 μm thick perfluorosulfonic acid membrane using a slot coating method to a coating thickness of 5 μm. After coating, the membrane was subjected to gradient drying: pre-drying at 40°C for 10 minutes, then drying at 80°C for 20 minutes, and finally drying under vacuum conditions (pressure 10 kPa) for 60 minutes to obtain a three-in-one module (3CCM).

[0058] S4. Frame Preparation and Lamination: A 30 μm-thick polyimide film was used as the frame material, and 5 μm-thick hot-melt adhesive was applied to both sides. The frame and the 3 CCM were hot-pressed at 100°C and 4 MPa for 30 seconds to form a five-in-one assembly (5 CCM).

[0059] S5 gas diffusion layer bonding: The 100μm thick gas diffusion layer (porosity 70%) and 5CCM at a temperature of 130 ℃, a pressure of 3MPa hot pressing for 60 seconds to form a seven-in-one assembly (7CCM);

[0060] S6. Post-treatment: The 7CCM was subjected to a heat aging treatment at a temperature of 90° C. and a relative humidity of 80% for 4 hours to obtain the final membrane electrode product.

[0061] Example 3

[0062] A high-performance membrane electrode based on a platinum-carbon catalyst, the preparation method comprising the following steps:

[0063] S1. Pretreatment of platinum-carbon catalyst: 10 g of a commercial platinum-carbon catalyst (Pt / C, platinum content 60 wt%) was placed in a plasma treatment apparatus and surface treated under an argon / oxygen mixed atmosphere (volume ratio 5:1) at a treatment power of 300 W for 10 minutes to obtain a surface-modified platinum-carbon catalyst;

[0064] S2. Preparation of catalytic layer slurry: 5 g of the modified platinum carbon catalyst obtained in step S1, 2 g of a sulfonated polyphenyl polymer having a sulfonation degree of 80%, 6 g of a mixture of ethylene glycol and glycerol, and 4 g of ultrapure water were mixed, first stirred at a low speed of 300 rpm for 30 minutes, then dispersed at a high shear speed of 1500 rpm for 30 minutes, and finally subjected to ultrasonic treatment (power 400 W, frequency 40 kHz) for 10 minutes to obtain a uniform and stable catalytic layer slurry;

[0065] S3. Preparation of the Catalytic Layer: The catalytic layer slurry was coated on both sides of a 25 μm thick perfluorosulfonic acid membrane using a slot coating method to a coating thickness of 15 μm. After coating, the membrane was subjected to gradient drying: pre-drying at 60°C for 5 minutes, then drying at 100°C for 10 minutes, and finally drying under vacuum conditions (pressure 1 kPa) for 30 minutes to obtain a three-in-one module (3CCM).

[0066] S4. Frame preparation and lamination: A 50 μm-thick polyimide film was used as the frame material, and a 10 μm-thick hot-melt adhesive was applied to both sides. The frame and the 3 CCM were hot-pressed at 120°C and 2 MPa for 60 seconds to form a five-in-one assembly (5 CCM).

[0067] S5 gas diffusion layer bonding: The 150μm thick gas diffusion layer (porosity 80%) and 5CCM at a temperature of 150 ℃, a pressure of 1MPa hot pressing for 90 seconds to form a seven-in-one assembly (7CCM);

[0068] S6. Post-treatment: The 7CCM was subjected to heat aging treatment at a temperature of 110° C. and a relative humidity of 100% for 2 hours to obtain the final membrane electrode product.

[0069] Comparative Example 1

[0070] S1. Preparation of catalytic layer slurry: 4 g of commercial platinum-carbon catalyst (Pt / C, platinum content 50 wt%), 1.5 g of sulfonated polyphenyl polymer with a 70% sulfonation degree, 5 g of ethylene glycol, and 3 g of ultrapure water were mixed. The mixture was first stirred at a low speed of 200 rpm for 45 minutes, then dispersed at a high speed of 1200 rpm for 45 minutes, and finally ultrasonically treated (power 300 W, frequency 30 kHz) for 15 minutes to obtain a uniform and stable catalytic layer slurry.

[0071] S2. Preparation of the Catalytic Layer: The catalytic layer slurry was coated on both sides of a 20 μm thick perfluorosulfonic acid membrane using a slot coating method to a coating thickness of 10 μm. After coating, the membrane was subjected to gradient drying: pre-drying at 50°C for 8 minutes, then drying at 90°C for 15 minutes, and finally drying under vacuum conditions (pressure 5 kPa) for 45 minutes to obtain a three-in-one module (3CCM).

[0072] S3. Frame Preparation and Lamination: A 40μm-thick polyimide film was used as the frame material, and 8μm-thick hot-melt adhesive was applied to both sides. The frame and 3CCM were hot-pressed at 110°C and 3MPa for 45 seconds to form a five-in-one assembly (5CCM).

[0073] S4 gas diffusion layer bonding: The 120μm thick gas diffusion layer (porosity 75%) and 5CCM at a temperature of 140 ℃, a pressure of 2MPa hot pressing for 75 seconds to form a seven-in-one assembly (7CCM);

[0074] S5. Post-treatment: The 7CCM was subjected to a heat aging treatment at a temperature of 100° C. and a relative humidity of 90% for 3 hours to obtain the final membrane electrode product.

[0075] Comparative Example 2

[0076] S1. Pretreatment of platinum-carbon catalyst: 10 g of a commercial platinum-carbon catalyst (Pt / C, platinum content 50 wt%) was placed in a plasma treatment apparatus and surface treated under an argon / oxygen mixed atmosphere (volume ratio 4:1) at a treatment power of 200 W for 20 minutes to obtain a surface-modified platinum-carbon catalyst;

[0077] S2. Preparation of catalytic layer slurry: 4 g of the modified platinum-carbon catalyst obtained in step S1, 1.5 g of Nafion resin, 5 g of ethylene glycol and 3 g of ultrapure water were mixed, first stirred at a low speed of 200 rpm for 45 minutes, then dispersed at a high speed of 1200 rpm for 45 minutes, and finally ultrasonically treated (power 300 W, frequency 30 kHz) for 15 minutes to obtain a uniform and stable catalytic layer slurry;

[0078] S3. Preparation of the Catalytic Layer: The catalytic layer slurry was coated on both sides of a 20 μm thick perfluorosulfonic acid membrane using a slot coating method to a coating thickness of 10 μm. After coating, the membrane was subjected to gradient drying: pre-drying at 50°C for 8 minutes, then drying at 90°C for 15 minutes, and finally drying under vacuum conditions (pressure 5 kPa) for 45 minutes to obtain a three-in-one module (3CCM).

[0079] S4. Frame Preparation and Lamination: A 40 μm-thick polyimide film was used as the frame material, and 8 μm-thick hot-melt adhesive was applied to both sides. The frame and the 3 CCM were hot-pressed at 110°C and 3 MPa for 45 seconds to form a five-in-one assembly (5 CCM).

[0080] S5 gas diffusion layer bonding: The 120μm thick gas diffusion layer (porosity 75%) and 5CCM at a temperature of 140 ℃, a pressure of 2MPa hot pressing for 75 seconds to form a seven-in-one assembly (7CCM);

[0081] S6. Post-treatment: The 7CCM was subjected to a heat aging treatment at a temperature of 100° C. and a relative humidity of 90% for 3 hours to obtain the final membrane electrode product.

[0082] Comparative Example 3

[0083] S1. Pretreatment of platinum-carbon catalyst: 10 g of a commercial platinum-carbon catalyst (Pt / C, platinum content 50 wt%) was placed in a plasma treatment apparatus and surface treated under an argon / oxygen mixed atmosphere (volume ratio 4:1) at a treatment power of 200 W for 20 minutes to obtain a surface-modified platinum-carbon catalyst;

[0084] S2. Preparation of catalytic layer slurry: 4 g of the modified platinum carbon catalyst obtained in step S1, 1.5 g of sulfonated polyphenyl polymer having a sulfonation degree of 70%, 5 g of ethylene glycol and 3 g of ultrapure water were mixed and dispersed at high shear speed of 1200 rpm for 45 minutes to obtain a catalytic layer slurry;

[0085] S3. Preparation of the Catalytic Layer: The catalytic layer slurry was coated on both sides of a 20 μm thick perfluorosulfonic acid membrane using a slot coating method to a coating thickness of 10 μm. After coating, the membrane was subjected to gradient drying: pre-drying at 50°C for 8 minutes, then drying at 90°C for 15 minutes, and finally drying under vacuum conditions (pressure 5 kPa) for 45 minutes to obtain a three-in-one module (3CCM).

[0086] S4. Frame Preparation and Lamination: A 40 μm-thick polyimide film was used as the frame material, and 8 μm-thick hot-melt adhesive was applied to both sides. The frame and the 3 CCM were hot-pressed at 110°C and 3 MPa for 45 seconds to form a five-in-one assembly (5 CCM).

[0087] S5 gas diffusion layer bonding: The 120μm thick gas diffusion layer (porosity 75%) and 5CCM at a temperature of 140 ℃, a pressure of 2MPa hot pressing for 75 seconds to form a seven-in-one assembly (7CCM);

[0088] S6. Post-treatment: 7CCM is subjected to heat aging treatment at a temperature of 100°C and a relative humidity of 90% for 3 hours to obtain the final membrane electrode product. Performance test:

[0089] The membrane electrode materials prepared in Examples 1-3 and Comparative Examples 1-3 were assembled into single cells, and their initial performance and performance after accelerated aging (maintained at 1.5 V for 24 hours) were tested under the same conditions. Test conditions: cell temperature 80°C, hydrogen / air stoichiometric ratio 1.5 / 2.0, back pressure 150 kPa, and relative humidity 100%.

[0090] The test results are shown in the following table:

[0091]

[0092]

[0093] The test results show that the membrane electrodes prepared in Examples 1-3 of the present invention are significantly superior to the comparative examples in terms of both initial performance and durability. In particular, the samples using plasma-treated platinum-carbon catalysts (Example 1 vs. Comparative Example 1) and sulfonated polyphenyl polymers (Example 1 vs. Comparative Example 2) exhibited superior performance retention. The three-stage dispersion process (Example 1 vs. Comparative Example 3) also significantly improved the performance of the membrane electrode.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst, characterized in that: The following steps are involved: (1) Platinum-carbon catalyst is subjected to plasma treatment to obtain a surface-modified platinum-carbon catalyst; (2) mixing and dispersing the surface-modified platinum-carbon catalyst, ionomer, and solvent to obtain an electrode slurry; (3) The electrode slurry is coated on one side or both sides of the proton membrane, and after sealing treatment, a membrane electrode for a fuel cell is obtained.

2. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to claim 1, characterized in that: The plasma treatment is oxygen plasma treatment.

3. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to claim 2, characterized in that: The atmosphere of the oxygen plasma treatment is a mixed gas of argon and oxygen; the volume ratio of argon to oxygen is (3-5):1; the treatment power is 100-300W, and the treatment time is 10-30 minutes.

4. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to claim 3, characterized in that: The structural formula of the sulfonated polyphenyl ionomer is: m:n is 1:(1-99).

5. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to claim 4, characterized in that: The solvent includes high boiling point alcohol and water.

6. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to claim 5, characterized in that: The high boiling point alcohol is ethylene glycol and / or glycerol.

7. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to claim 6, characterized in that: The mass ratio of the platinum-carbon catalyst, the ionomer, the high-boiling-point alcohol and water is (3-5):(1-2):(4-6):(2-4).

8. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to any one of claims 1 to 7, characterized in that: The mixing and dispersing steps are: first stirring at a low speed of 100-300 rpm for 30-60 minutes, then dispersing at a high speed of 1000-1500 rpm for 30-60 minutes, and finally performing ultrasonic treatment for 10-20 minutes to obtain a uniform and stable electrode slurry.

9. The method for preparing a high-performance membrane electrode based on a platinum-carbon catalyst according to claim 1, characterized in that: The proton membrane is a sulfonic acid proton exchange membrane or a sulfonated polyphenyl proton exchange membrane.

10. A high-performance membrane electrode based on a platinum-carbon catalyst prepared by the method according to any one of claims 1 to 9.

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