A fuel cell CCM electrode, its preparation method and membrane electrode
By using a water-based high-water alcohol ratio catalyst slurry and a contact gradient temperature-controlled heating method, the crack problem during the coating process of the CCM electrode of the fuel cell is solved, and more efficient catalytic layer drying and membrane electrode performance improvement are achieved.
Patent Information
- Application Number
- CN202211659190.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-22
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2042-12-22
AI Technical Summary
In the prior art, the catalytic layer of the fuel cell CCM electrode is prone to cracks during the coating process, which affects the electrode performance and life, and the existing methods have problems such as low preparation efficiency and high cost.
The catalyst slurry of high water-alcohol ratio in water is used, combined with contact gradient temperature controlled heating and non-contact heating and drying, and the anode and cathode catalytic layers are coated separately to control the heating temperature gradient in different areas to avoid uneven stress release during the catalyst layer drying process.
The crack formation of the catalytic layer is effectively avoided, the drying efficiency and uniformity of the catalytic layer are improved, and the performance and life of the membrane electrode are improved.
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Figure CN115986136B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell CCM electrode, a preparation method thereof, and a membrane electrode. Background Art
[0002] Usually, the membrane electrode is composed of a three-in-one CCM (catalyst coated membrane) electrode, a sealing frame and a gas diffusion layer. Among them, the three-in-one CCM electrode (hereinafter referred to as CCM electrode) is the most core component of the entire membrane electrode, which determines the performance, life and cost of the final membrane electrode product. Conventional methods for preparing CCM electrodes include ultrasonic spraying, transfer printing, etc. The above methods are currently the most mature and widely used preparation methods. However, the ultrasonic spraying and transfer methods may have defects such as low preparation efficiency, low degree of continuity, or low catalyst slurry utilization and high production costs. In recent years, with the continuous advancement of fuel cell technology and equipment, the slit direct coating process has gradually become the focus of attention in the membrane electrode coating process due to its advantages such as high efficiency and continuity.
[0003] The CCM electrode is coated using a slot direct coating process. The catalyst layer goes from wet to dry for tens of seconds or minutes depending on the drying time and temperature. Therefore, if the dry thickness of the catalyst layer reaches more than 10μm, the stress in the catalyst layer is likely to not be effectively released during the drying process and will appear in the form of cracks. For CCM electrodes, the platinum loading of the anode catalyst layer is about 0.05-0.20mg / cm 2 , corresponding to a thickness of about 2 to 8 μm; the precious metal platinum loading of the cathode catalyst layer is about 0.25-0.40 mg / cm 2 , corresponding to a thickness of about 10 to 16 μm. It can be seen from this that if the cathode catalyst layer of the proton exchange membrane is directly coated with a narrow slit, it will be difficult to avoid slight or severe cracks. On the one hand, the cracks formed on the surface of the catalyst layer will affect the consistency of the in-plane loading and thickness of the CCM electrode, thereby affecting the consistency and performance output of the in-plane current distribution of the membrane electrode prepared by the CCM electrode. On the other hand, the cracks formed on the surface of the catalyst layer will also cause adverse effects such as water flooding of the membrane electrode during operation and accelerated degradation of the proton membrane, which will lead to faster life decay of the membrane electrode.
[0004] Currently, the existing technology uses high-boiling point solvents or additives to inhibit the formation of cracks, but there are problems such as long drying time of the catalyst layer and difficulty in removing the additives. There is also a layer-by-layer coating method using the same catalyst slurry to inhibit the formation of cracks, but this method requires gradually reducing the amount of slurry used. The process is relatively cumbersome and cannot effectively avoid undesirable phenomena such as thick edges of the catalyst layer.
[0005] Therefore, there is an urgent need for a more effective preparation method for fuel cell CCM electrodes, so as to obtain a CCM electrode with a catalytic layer that is not prone to cracks and has a uniform coating while meeting the target platinum loading. Summary of the Invention
[0006] The purpose of the present invention is to overcome the defects of the prior art that the catalytic layer of the CCM electrode is prone to cracks and uneven coating.
[0007] In order to achieve the above object, the present invention provides a method for preparing a fuel cell CCM electrode, comprising the following steps:
[0008] S1, preparation of the first catalyst slurry:
[0009] Weighing a first catalyst and wetting the catalyst with deionized water; adding a perfluorosulfonic acid resin solution, stirring evenly, then adding a first dispersion liquid, stirring evenly to obtain a first catalyst slurry; wherein the mass ratio of the perfluorosulfonic acid resin to the first catalyst is (0.04-0.08):(0.4-0.6); the first dispersion liquid is composed of deionized water and alcohol, wherein the mass percentage of deionized water to alcohol is (50%-75%):(25%-50%);
[0010] S2, preparation of the second catalyst slurry:
[0011] Weighing a second catalyst, wetting the catalyst with deionized water; adding a perfluorosulfonic acid resin solution, stirring evenly, then adding a second dispersion, stirring evenly to obtain a second catalyst slurry; wherein the mass ratio of the perfluorosulfonic acid resin to the second catalyst is (0.04-0.08): (0.4-0.6); the second dispersion is composed of deionized water and alcohol, wherein the mass percentage of deionized water to alcohol is (75%-100%): (0%-25%);
[0012] S3, Preparation of Fuel Cell CCM Electrodes:
[0013] A proton exchange membrane is provided, and the first catalyst slurry and the second catalyst slurry are used to coat the anode catalyst layer and the cathode catalyst layer of the proton exchange membrane, respectively. During the coating, the proton exchange membrane is contact-heated, and the heating temperature of the starting and ending areas of the proton exchange membrane is controlled to be lower than the heating temperature of the middle area. After the coating is completed, the proton exchange membrane is further non-contact-heated, and the non-contact heating temperature is lower than the contact heating temperature, to obtain a fuel cell CCM electrode;
[0014] The first catalyst and the second catalyst include any one of a carbon-supported platinum-based catalyst, a carbon-supported non-platinum catalyst, an oxide-supported platinum-based catalyst, and an oxide-supported non-platinum catalyst, or a combination of any two or more thereof.
[0015] Preferably, the alcohol comprises any one of methanol, ethanol, n-propanol, and isopropanol, or a combination of any two or more thereof.
[0016] Preferably, in step S3, the contact heating includes flat plate contact heating and roller contact heating.
[0017] Preferably, in step S3, the non-contact heating includes hot air non-contact heating and infrared non-contact heating.
[0018] Preferably, in step S3, under contact heating, the heating temperature of the starting coating area is 55-60°C, the heating temperature of the finishing area is 55-60°C, and the heating temperature of the middle area is 60-70°C.
[0019] Preferably, in step S3, the non-contact heating temperature is 50-55°C.
[0020] Preferably, the EW value of the perfluorosulfonic acid resin is 700-1200.
[0021] Preferably, the coating method is a slit direct coating method.
[0022] The present invention also provides a fuel cell CCM electrode, which is prepared by the above preparation method.
[0023] The present invention also provides a membrane electrode, which includes the above-mentioned fuel cell CCM electrode, a sealing frame for sealing the fuel cell CCM electrode, and a gas diffusion layer.
[0024] Beneficial effects of the present invention:
[0025] (1) Both the anode catalyst layer and the cathode catalyst layer of the fuel cell CCM electrode are directly coated with catalyst slurry in narrow slits. The present application adopts two methods: contact heating coating and non-contact heating drying. During coating, the wet catalyst layer is first subjected to contact heating coating, wherein a gradient temperature control method is used in the contact heating coating, that is, the heating temperature of the starting coating area and the ending area is lower than that of the middle area. In the traditional isothermal drying during contact heating coating, the undried slurry in the middle area tends to flow to the two side areas, resulting in a thick edge phenomenon, which can easily lead to insufficient stress release and cracks; the present invention adopts contact gradient temperature control heating coating, which can effectively ensure that the drying speeds of different areas of the catalyst layer tend to be the same, avoiding the thick edge phenomenon and making cracks less likely to occur.
[0026] (2) Generally, the proton exchange membrane is prone to swelling when absorbing water or alcohol. The use of contact-type gradient temperature-controlled heating coating can impose certain constraints on the swelling of the proton exchange membrane. After the contact-type gradient temperature-controlled heating coating, non-contact heating drying is performed, and the temperature of the contact-type gradient temperature-controlled heating coating is higher than that of the non-contact drying, which can ensure that the catalytic layer in direct contact is dried from the inside out, making it less likely to crack. Furthermore, the catalyst slurry traditionally used is an aqueous (low water-to-alcohol ratio) slurry, and the present application uses an aqueous (high water-to-alcohol ratio) slurry, combined with gradient temperature-controlled heating coating, so that the internal catalytic layer and the proton exchange membrane have a higher bonding force, so the internal stress will not cause the catalytic layer to crack, and the drying efficiency of the catalytic layer can also be further improved.
[0027] (3) Cracks in the catalytic layer will lead to a large deviation in the platinum loading of the catalytic layer, which will not only increase the contact resistance between the catalytic layer and the gas diffusion layer, but also cause uneven current distribution within the catalytic layer, thereby affecting the membrane electrode. The CCM electrode prepared using this method is not prone to cracks, and after being used to make membrane electrodes, the performance of the membrane electrode is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 Schematic diagram of fuel cell CCM electrode coating.
[0029] Figure 2 The following are microscopic images of the anode catalyst layer and cathode catalyst layer of the embodiment.
[0030] Figure 3 Microscopic images of the anode catalyst layer and cathode catalyst layer of Comparative Example 1.
[0031] Figure 4 Microscopic images of the anode catalyst layer and cathode catalyst layer of Comparative Example 2.
[0032] Figure 5 2 is a comparison chart of the membrane electrode polarization performance of the embodiment and comparative examples 1 and 2.
[0033] Figure 6 Schematic diagram of the drying principle of the embodiment.
[0034] Figure 7 This is a schematic diagram of the drying principle of Comparative Example 2. DETAILED DESCRIPTION
[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.
[0036] The present invention provides a method for preparing a fuel cell CCM electrode, comprising the following steps:
[0037] S1, preparation of the first catalyst slurry:
[0038] Weighing a first catalyst and wetting the catalyst with deionized water; adding a perfluorosulfonic acid resin solution, stirring evenly, then adding a first dispersion liquid, stirring evenly to obtain a first catalyst slurry; wherein the mass ratio of the perfluorosulfonic acid resin to the first catalyst is (0.04-0.08):(0.4-0.6); the first dispersion liquid is composed of deionized water and alcohol, wherein the mass percentage of deionized water to alcohol is (50%-75%):(25%-50%);
[0039] S2, preparation of the second catalyst slurry:
[0040] Weighing a second catalyst, wetting the catalyst with deionized water; adding a perfluorosulfonic acid resin solution, stirring evenly, then adding a second dispersion, stirring evenly to obtain a second catalyst slurry; wherein the mass ratio of the perfluorosulfonic acid resin to the second catalyst is (0.04-0.08): (0.4-0.6); the second dispersion is composed of deionized water and alcohol, wherein the mass percentage of deionized water to alcohol is (75%-100%): (0%-25%);
[0041] S3, Preparation of Fuel Cell CCM Electrodes:
[0042] A proton exchange membrane is provided, and the first catalyst slurry and the second catalyst slurry are used to coat the anode catalyst layer and the cathode catalyst layer of the proton exchange membrane, respectively. During the coating, the proton exchange membrane is contact-heated, and the heating temperature of the starting and ending areas of the proton exchange membrane is controlled to be lower than the heating temperature of the middle area. After the coating is completed, the proton exchange membrane is further non-contact-heated, and the non-contact heating temperature is lower than the contact heating temperature, to obtain a fuel cell CCM electrode;
[0043] The first catalyst and the second catalyst include any one of a carbon-supported platinum-based catalyst, a carbon-supported non-platinum catalyst, an oxide-supported platinum-based catalyst, and an oxide-supported non-platinum catalyst, or a combination of any two or more thereof. The alcohol includes any one of methanol, ethanol, n-propanol, and isopropanol, or a combination of any two or more thereof. Isopropanol is used in both the present embodiment and the comparative example.
[0044] like Figure 1 The figure shows a schematic diagram of the fuel cell CCM electrode of the present invention, which mainly includes an anode catalyst layer and a cathode catalyst layer, wherein the anode catalyst layer is coated with a first catalyst slurry to form an ACL, and the cathode catalyst layer is coated with a second catalyst slurry to form a CCL, and the coating method adopted is a slit direct coating method.
[0045] Perfluorosulfonic acid resin is currently the most commonly used component in catalyst slurries, primarily serving as a proton conductor in the catalyst layer. The EW value used in this invention is 700-1200. The EW value represents the perfluorosulfonic acid ionomer equivalent weight (EW), which represents the dry weight of the perfluorosulfonic acid ionomer containing one mole of ionic groups.
[0046] Example
[0047] The method for preparing a fuel cell CCM electrode of the present invention comprises the following steps:
[0048] (1) Preparation of the first catalyst slurry
[0049] Weigh 1.6 g of platinum-carbon (Pt / C) catalyst and use a small amount of deionized water to fully wet the catalyst; add 3.3 g of 20% perfluorosulfonic acid resin solution and stir evenly; finally, add 6.9 g of deionized water and 6.9 g of isopropanol, disperse evenly and set aside.
[0050] (2) Preparation of the second catalyst slurry
[0051] Weigh 1.6 g of platinum-carbon (Pt / C) catalyst and use a small amount of deionized water to fully wet the catalyst; add 4.5 g of 20% perfluorosulfonic acid resin solution and stir evenly; finally, add 12.7 g of deionized water and 3.2 g of isopropanol, disperse evenly and set aside.
[0052] (3) CCM electrode preparation
[0053] Provide a proton exchange membrane, use the first catalyst slurry and the second catalyst slurry to coat the anode catalyst layer and the cathode catalyst layer of the proton exchange membrane respectively, and control the loading of the anode catalyst layer and the cathode catalyst layer to be 0.1 mg / cm 2 and 0.4 mg / cm 2 During coating, the proton exchange membrane is placed on a vacuum heating bottom plate for contact heating coating, and the heating temperature of the starting coating area and the ending area of the proton exchange membrane is controlled to be lower than the heating temperature of the middle area. In this embodiment, the heating temperature of the starting coating area is 55-60°C, the heating temperature of the ending area is 55-60°C, and the heating temperature of the middle area is 60-70°C. After coating is completed, the coated proton exchange membrane is moved to a hot air oven for non-contact heating and drying. The non-contact heating temperature is 50-55°C. After drying, a fuel cell CCM electrode is obtained. T1 represents the non-contact heating temperature, and T2-T4 represent the contact heating temperature.
[0054] Contact heating coating involves direct contact heating between the fuel cell CCM electrodes and a heating medium, including flat plate contact heating and roller contact heating. Non-contact heating and drying involves non-contact heating between the fuel cell CCM electrodes and a heating medium, including hot air non-contact heating and drying with infrared rays. In this embodiment, the heating temperature for the starting coating area is 60°C, the heating temperature for the finishing area is 60°C, the heating temperature for the middle area is 70°C, and the non-contact heating temperature is 55°C.
[0055] The fuel cell CCM electrode was prepared using the above method. This fuel cell CCM electrode was then used to prepare a membrane electrode. The prepared fuel cell CCM electrode was frame-sealed and gas diffusion layer-laminated to form the finished membrane electrode. The membrane electrode was then placed on a fuel cell test fixture for activation and polarization performance testing. The test conditions were: a cell temperature of 78°C, anode / cathode humidity of 50% / 80%, anode / cathode backpressures of 170kPa / 150kPa, and anode / cathode excess coefficients of 2.0 / 3.0.
[0056] Comparative Example 1
[0057] (1) Preparation of the first catalyst slurry
[0058] Weigh 1.6 g of platinum-carbon (Pt / C) catalyst and use a small amount of deionized water to fully wet the catalyst; add 3.3 g of 20% perfluorosulfonic acid resin solution and stir evenly; finally, add 4.6 g of deionized water and 9.1 g of isopropanol, disperse evenly and set aside.
[0059] (2) Preparation of the second catalyst slurry
[0060] Weigh 1.6 g of platinum-carbon (Pt / C) catalyst and use a small amount of deionized water to fully wet the catalyst; add 4.5 g of 20% perfluorosulfonic acid resin solution and stir evenly; finally, add 5.3 g of deionized water and 10.6 g of isopropanol, disperse evenly and set aside.
[0061] (3) CCM electrode preparation
[0062] A proton exchange membrane is provided, and the anode catalyst layer and the cathode catalyst layer of the proton exchange membrane are coated with the first catalyst slurry and the second catalyst slurry respectively, and the loading of the anode catalyst layer and the cathode catalyst layer is controlled to be 0.1 mg / cm 2 and 0.4 mg / cm 2During coating, the proton exchange membrane is placed on a vacuum heating bottom plate for contact heating coating. The heating temperature of the starting and ending areas of the proton exchange membrane is controlled to be lower than the heating temperature of the middle area. The heating temperature of the starting area is 55-60°C, the heating temperature of the ending area is 55-60°C, and the heating temperature of the middle area is 60-70°C. After coating is completed, the coated proton exchange membrane is moved to a hot air oven for non-contact heating and drying. The non-contact heating temperature is 50-55°C. After drying, the fuel cell CCM electrode is obtained.
[0063] Among them, in this comparative example, the heating temperature of the starting coating area is 60°C, the heating temperature of the ending area is 60°C, the heating temperature of the middle area is 70°C, and the non-contact heating temperature is 55°C.
[0064] The fuel cell CCM electrode was prepared using the above method. This fuel cell CCM electrode was then used to prepare a membrane electrode. The prepared fuel cell CCM electrode was frame-sealed and gas diffusion layer-laminated to form the finished membrane electrode. The membrane electrode was then placed on a fuel cell test fixture for activation and polarization performance testing. The test conditions were: a cell temperature of 78°C, anode / cathode humidity of 50% / 80%, anode / cathode backpressures of 170kPa / 150kPa, and anode / cathode excess coefficients of 2.0 / 3.0.
[0065] Comparative Example 2
[0066] (1) Preparation of the first catalyst slurry
[0067] Weigh 1.6 g of platinum-carbon (Pt / C) catalyst and use a small amount of deionized water to fully wet the catalyst; add 3.3 g of 20% perfluorosulfonic acid resin solution and stir evenly; finally, add 6.9 g of deionized water and 6.9 g of isopropanol, disperse evenly and set aside.
[0068] (2) Preparation of the second catalyst slurry
[0069] Weigh 1.6 g of platinum-carbon (Pt / C) catalyst and use a small amount of deionized water to fully wet the catalyst; add 4.5 g of 20% perfluorosulfonic acid resin solution and stir evenly; finally, add 12.7 g of deionized water and 3.2 g of isopropanol, disperse evenly and set aside.
[0070] (3) CCM electrode preparation
[0071] A proton exchange membrane is provided, and the anode catalyst layer and the cathode catalyst layer of the proton exchange membrane are coated with the first catalyst slurry and the second catalyst slurry respectively, and the loading of the anode catalyst layer and the cathode catalyst layer is controlled to be 0.1 mg / cm 2 and 0.4 mg / cm 2During coating, the proton exchange membrane is placed on a vacuum heating base plate for contact heating coating. The temperature of the contact heating coating is 60°C. After coating, the coated proton exchange membrane is moved to a hot air oven for non-contact heating drying. The temperature of the non-contact heating drying is 70°C. After drying, the fuel cell CCM electrode is obtained.
[0072] The fuel cell CCM electrode was prepared using the above method. This fuel cell CCM electrode was then used to prepare a membrane electrode. The prepared fuel cell CCM electrode was frame-sealed and gas diffusion layer-laminated to form the finished membrane electrode. The membrane electrode was then placed on a fuel cell test fixture for activation and polarization performance testing. The test conditions were: a cell temperature of 78°C, anode / cathode humidity of 50% / 80%, anode / cathode backpressures of 170kPa / 150kPa, and anode / cathode excess coefficients of 2.0 / 3.0.
[0073] Experimental results :
[0074] like Figure 2 As shown, the embodiment uses an aqueous (high water-to-alcohol ratio) slurry and a gradient temperature control method. The anode and cathode catalyst layers formed at a specified platinum loading have good quality corresponding to different regions and have no obvious cracks.
[0075] like Figure 3 As shown, comparative example 1 uses alcohol-based (low water-alcohol ratio) slurry for coating. From the microscopic image of the catalytic layer, it can be seen that the coating quality of the corresponding low-loading catalytic layer of the anode is good, without obvious cracks; there are no obvious cracks in the middle area of the corresponding cathode catalytic layer, but obvious cracks appear in the starting and ending areas of the coating.
[0076] like Figure 4 As shown, Comparative Example 2 adopts a water system (high water-alcohol ratio), and the heating temperature of the non-contact heating drying is controlled to be higher than the heating temperature of the contact heating drying during the drying process of the catalytic layer. It can be seen from the microscopic image of the catalytic layer that there are slight cracks in the starting and ending areas of the corresponding low-load catalytic layer of the anode, and different areas of the corresponding cathode catalytic layer all show crack characteristics, especially the cracks in the starting and ending areas are more serious.
[0077] like Figure 5As shown, the membrane electrode performance of the fuel cell CCM electrode prepared by the present invention is the best, while the membrane electrode performance prepared by Comparative Example 2 is the worst, especially in the high current region. The membrane electrode performance corresponding to the embodiment is significantly better than the membrane electrode performance corresponding to Comparative Examples 1 and 2. This is mainly because: the formation of cracks will lead to a large deviation in the platinum loading of the catalytic layer, which will not only increase the contact resistance between the catalytic layer and the gas diffusion layer, but also lead to uneven current distribution within the catalytic layer, thereby affecting the membrane electrode performance. On the other hand, since fuel cells generate electricity through electrochemical reactions and generate water at the same time, the higher the current, the more water is generated, and the greater the diffusion resistance of the generated water at the cracks, so in the high current region, a large amount of water generated by the cathode catalyst layer is easy to accumulate at the cracks, resulting in a reduction in the active sites of the catalytic layer and an increase in concentration polarization. In severe cases, it may even cause adverse phenomena such as reverse polarity of the membrane electrode.
[0078] like Figure 6 、 7 As shown, when the conventional drying method is adopted, the solvent evaporates faster at the edge of the catalyst layer. Due to the slurry casting effect and the tension effect of the dispersed particles in the slurry, the undried slurry in the middle area flows to the middle area, resulting in a thick edge phenomenon. The contact gradient temperature control heating coating method in the present invention can ensure that the drying speeds of different areas of the catalyst layer tend to be the same, and gradually dry from the inner layer to the outer layer. Combined with the good bonding effect between the aqueous catalyst slurry and the proton exchange membrane during the drying process, it is ensured that there are no obvious cracks in the anode and cathode catalyst layers with different loadings.
[0079] The fuel cell CCM electrode prepared according to the preparation method of the present invention can also be used to prepare a membrane electrode, which includes a fuel cell CCM electrode, a sealing frame for sealing the fuel cell CCM electrode, and a gas diffusion layer.
[0080] In summary, by coating the anode catalyst layer and cathode catalyst layer with a water-based (high water-to-alcohol ratio) slurry, the bonding strength between the catalyst layer and the proton exchange membrane is enhanced. First, a contact-type gradient temperature-controlled heating coating method is used to set different heating temperatures for the starting, middle, and ending areas, and then non-contact heating and drying are performed. This effectively ensures that the drying speed of different areas of the catalyst layer tends to be consistent, effectively solving the cracking phenomenon that occurs in the anode catalyst layer and cathode catalyst layer during the coating process. The membrane electrode prepared from this fuel cell CCM electrode has higher performance and lifespan.
[0081] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.
Claims
1. A method for preparing a fuel cell CCM electrode, characterized in that: The following steps are involved: S1, preparation of the first catalyst slurry: Weighing a first catalyst and wetting the catalyst with deionized water; adding a perfluorosulfonic acid resin solution, stirring evenly, then adding a first dispersion liquid, stirring evenly to obtain a first catalyst slurry; wherein the mass ratio of the perfluorosulfonic acid resin to the first catalyst is (0.04-0.08):(0.4-0.6); the first dispersion liquid is composed of deionized water and alcohol, wherein the mass percentage of deionized water to alcohol is (50%-75%):(25%-50%); S2, preparation of the second catalyst slurry: Weighing a second catalyst, wetting the catalyst with deionized water; adding a perfluorosulfonic acid resin solution, stirring evenly, then adding a second dispersion, stirring evenly to obtain a second catalyst slurry; wherein the mass ratio of the perfluorosulfonic acid resin to the second catalyst is (0.04-0.08): (0.4-0.6); the second dispersion is composed of deionized water and alcohol, wherein the mass percentage of deionized water to alcohol is (75%-100%): (0%-25%); S3, Preparation of Fuel Cell CCM Electrodes: A proton exchange membrane is provided, and the first catalyst slurry and the second catalyst slurry are used to coat the anode catalyst layer and the cathode catalyst layer of the proton exchange membrane respectively. During coating, the proton exchange membrane is contact-heated, and the heating temperatures of the starting and ending areas of the proton exchange membrane are controlled to be lower than the heating temperature of the middle area. After coating is completed, the proton exchange membrane is further non-contact-heated, and the non-contact heating temperature is lower than the contact heating temperature, to obtain a fuel cell CCM electrode; under contact heating, the heating temperature of the starting area is 55-60°C, the heating temperature of the ending area is 55-60°C, and the heating temperature of the middle area is 60-70°C; the heating temperature of the non-contact heating is 50-55°C; wherein the first catalyst and the second catalyst include any one of a carbon-supported platinum-based catalyst, a carbon-supported non-platinum catalyst, an oxide-supported platinum-based catalyst, and an oxide-supported non-platinum catalyst, or a combination of any two or more thereof.
2. The preparation method according to claim 1, wherein The alcohol includes any one of methanol, ethanol, n-propanol, and isopropanol, or a combination of any two or more thereof.
3. The preparation method according to claim 1, wherein In step S3, the contact heating includes flat plate contact heating and roller contact heating.
4. The preparation method according to claim 1, wherein In step S3, the non-contact heating includes hot air non-contact heating and infrared non-contact heating.
5. The preparation method according to claim 1, wherein The EW value of the perfluorosulfonic acid resin is 700-1200.
6. The preparation method according to claim 1, wherein The coating method is a slit direct coating method.
7. A fuel cell CCM electrode, characterized in that: The fuel cell CCM electrode is prepared by the preparation method according to any one of claims 1 to 6.
8. A membrane electrode made from the fuel cell CCM electrode according to claim 7, characterized in that: The membrane electrode comprises a fuel cell CCM electrode, a sealing frame for sealing the fuel cell CCM electrode, and a gas diffusion layer.
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