Catalyst proton membrane coating and preparation method therefor, membrane electrode, and fuel cell

Abstract

A catalyst proton membrane coating and a preparation method therefor, a membrane electrode, and a fuel cell. The preparation method comprises: firstly, adding a sodium resin into a water-alcohol dispersion of a Pt / C catalyst, and fully stirring and dispersing same to obtain a catalyst slurry; secondly, coating the catalyst slurry on a PTFE membrane, drying same at normal temperature, then transferring same into an inert atmosphere sintering box, and performing a heat treatment to obtain a catalyst-PTFE coating membrane; thirdly, preparing the catalyst-PTFE coating membrane and a proton exchange membrane into a catalyst proton membrane transfer printing layer by means of hot-press transfer printing; and finally, performing a protonation treatment on the catalyst proton membrane transfer printing layer, so as to obtain a catalyst proton membrane coating. By utilizing the characteristic of good thermal stability of the sodium resin, the crystallization degree of a perfluorosulfonic acid resin in the catalyst proton membrane coating is improved by means of a subsequent heat treatment, thereby effectively improving the resistance to free radical oxidation and corrosion.

Description

Catalyst proton membrane coating and preparation method thereof, and membrane electrode and fuel cell TECHNICAL FIELD

[0001] The present application relates to the technical field of proton exchange membrane fuel cells, in particular to a catalyst proton membrane coating and a preparation method thereof, and a membrane electrode and a fuel cell. BACKGROUND

[0002] The proton exchange membrane fuel cell is an energy conversion device that can directly convert chemical energy in hydrogen fuel and oxidant into electrical energy through electrochemical reaction. Fuel cells have the characteristics of high energy conversion efficiency and no waste gas emission, and are considered one of the most promising solutions to energy crisis and environmental pollution.

[0003] The membrane electrode is the core component of the fuel cell, provides a reaction site for the reactants of the fuel cell, converts chemical energy into electrical energy, and is a multiphase mass transfer and electrochemical reaction site. The performance and durability of the membrane electrode directly determine the power generation efficiency and service life of the fuel cell. When the fuel cell is running, strong oxidative oxygen radicals are continuously generated in the catalyst layer of the membrane electrode, which attack the perfluorosulfonic acid resin in the catalyst layer, causing structural damage and proton conduction capacity decay, thereby affecting the performance output and service life of the membrane electrode. In order to solve this problem, the strategy is usually to introduce anti-radical additives such as CeO2, Pt, etc. to reduce strong oxidative radicals, thereby alleviating the oxidation corrosion of radicals on perfluorosulfonic acid resin. However, the above methods all introduce external additives, and the additives are prone to agglomeration, loss and other problems. SUMMARY

[0004] The purpose of the present application is to overcome the above technical deficiencies, and to provide a catalyst proton membrane coating and a preparation method thereof, and a membrane electrode and a fuel cell without introducing any additives, solving the technical problems of complex process and additive agglomeration and loss caused by introducing anti-oxidation additives in the prior art.

[0005] To solve the above technical problems, the present application first provides a preparation method of a catalyst proton membrane coating, comprising:

[0006] S10, adding sodium type resin into the water-alcohol dispersion liquid of Pt / C catalyst, fully stirring and dispersing to obtain catalyst slurry;

[0007] S20, coating the catalyst slurry on the PTFE membrane, drying at room temperature, and then transferring to an inert atmosphere sintering box for heat treatment to obtain a catalyst PTFE coating membrane;

[0008] S30, preparing a catalyst proton membrane transfer layer by hot pressing transfer of the catalyst PTFE coating membrane and the proton exchange membrane;

[0009] S40, the catalyst proton membrane transfer layer is subjected to protonation treatment to obtain a catalyst proton membrane coating.

[0010] In the step S20, the heat treatment step includes: transferring the PTFE membrane containing the catalyst slurry to a sintering box in an inert atmosphere, introducing an inert gas to sufficiently remove air, starting heating to a set temperature, keeping for a heat treatment time, and naturally cooling to room temperature to obtain a heat-treated catalyst PTFE coating membrane; the inert gas is nitrogen or argon, the heat treatment temperature is 180-250℃, and the heat treatment time is 20-60min.

[0011] Preferably, in the step S10, the sodium type resin is a sodium type perfluorosulfonic acid resin solution containing 5wt%-20wt% of sodium, and the ion exchange equivalent of the sodium type resin is 700-1100meq / g.

[0012] Preferably, in the step S20, the thickness of the PTFE membrane is 100-300μm, and the temperature resistance range is 280-320℃.

[0013] Preferably, in the step S30, the temperature of the heat press transfer method is 120-160℃, and the pressure of the heat press transfer method is 1-5MPa.

[0014] Preferably, the step S40 specifically includes:

[0015] S401, the catalyst proton membrane transfer layer is immersed in a 0.1-1mol / L H2SO4 solution, soaked at 50-80℃ for 20-40min, then soaked in deionized water;

[0016] S402, the catalyst proton membrane transfer layer is air-dried at room temperature, and subjected to gradient drying treatment at 60-100℃ to obtain a catalyst proton membrane coating.

[0017] Correspondingly, the application also provides a catalyst proton membrane coating prepared by the preparation method of any one of the catalyst proton membrane coating.

[0018] Correspondingly, the application further provides a membrane electrode, which comprises the catalyst proton membrane coating, a frame membrane and a gas diffusion layer, and the catalyst proton membrane coating, the frame membrane and the gas diffusion layer are sequentially attached.

[0019] Correspondingly, the application further provides a fuel cell comprising the membrane electrode.

[0020] The beneficial effects of the present application are: different from the prior art, the present application provides a catalyst proton membrane coating and a preparation method thereof without introducing any additives, and a membrane electrode and a fuel cell, the preparation method comprises: firstly, adding a sodium type resin into a water-alcohol dispersion liquid of a Pt / C catalyst, fully stirring and dispersing to obtain a catalyst slurry, secondly, coating the catalyst slurry on a PTFE membrane, drying at room temperature and then transferring to an inert atmosphere sintering box for heat treatment to obtain a catalyst PTFE coating membrane, thirdly, preparing a catalyst proton membrane transfer layer by heat pressing and transferring the catalyst PTFE coating membrane and a proton exchange membrane, and finally, performing protonation treatment on the catalyst proton membrane transfer layer to obtain the catalyst proton membrane coating; the sodium type resin is used to replace the hydrogen type resin to prepare the catalyst proton membrane coating, the sodium type resin has good thermal stability, the crystallinity of the perfluorosulfonic acid resin in the catalyst proton membrane coating is improved through subsequent heat treatment, the resin with high crystallinity in the catalyst proton membrane coating can effectively improve the anti-free radical oxidation corrosion ability and ensure the stability of the three-phase reaction site, so that the anti-free radical corrosion ability and durability of the membrane electrode are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a preparation method flowchart of the catalyst proton membrane coating provided by the embodiment of the present application;

[0022] Fig. 2 is a scanning electron microscope picture of the surface microstructure of the catalyst proton membrane coating prepared in Example 1 of the present application;

[0023] Fig. 3 is a scanning electron microscope picture of the surface microstructure of the conventional catalyst proton membrane coating prepared in Comparative Example 1 of the present application;

[0024] Fig. 4 is a schematic diagram of the comparison results of I-V curve tests of Example 1 and Comparative Example 1 of the present application. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Please refer to Fig. 1, which is a preparation method flowchart of the catalyst proton membrane coating provided by the embodiment of the present application; the preparation method of the catalyst proton membrane coating provided by the present application comprises:

[0027] S10, adding a sodium type resin into a water-alcohol dispersion liquid of a Pt / C catalyst, fully stirring and dispersing to obtain a catalyst slurry.

[0028] Specifically, S10 further comprises:

[0029] First, a sodium type resin is provided, the full name of the sodium type resin is called sodium type cation exchange resin, which is obtained by converting strong acid ion exchange resin and sodium chloride, it contains a large number of sodium ions, and can adsorb more adsorption ions in water. The sodium type resin has the characteristics of stable water quality, long service life, fast exchange speed, strong ion adsorption capacity, uniform particles, good pollution resistance and the like.

[0030] In the present application, the sodium type resin is a sodium type perfluorosulfonic acid resin solution containing 5wt%-20wt% of sodium type, and the ion exchange equivalent (EW value represents the mass of the film required for 1 mol of cation, the smaller the EW value, the greater the proton density in the film, and the better the conductivity of the film) of the sodium type resin is 700-1100meq / g.

[0031] Then, the sodium type resin is added to the water-alcohol dispersion liquid of the Pt / C catalyst, and is fully stirred and dispersed to obtain a catalyst slurry.

[0032] S20, the catalyst slurry is coated on the PTFE film, dried at room temperature, and then transferred to an inert atmosphere sintering box for heat treatment to obtain a catalyst PTFE coated film.

[0033] Specifically, S20 further comprises:

[0034] The catalyst slurry is coated on the PTFE film, dried at room temperature, and then transferred to an inert atmosphere sintering box for heat treatment to obtain a catalyst PTFE coated film; wherein the PTFE film is a microporous film produced by special processes such as premixing, extruding, calendering and bidirectional stretching using polytetrafluoroethylene dispersion resin, the PTFE film has a fibrillar microporous structure, the porosity is more than 85%, there are 1.4 billion micropores per square centimeter, and the pore size range is 0.02μm-15μm.

[0035] Preferably, the thickness of the PTFE film is 100μm-300μm, and the temperature resistance range is 280℃~320℃.

[0036] Specifically, in the step S20, the heat treatment step comprises: transferring the PTFE film containing the catalyst slurry to an inert atmosphere sintering box, introducing inert gas to fully remove air, starting heating to a set temperature, keeping for a heat treatment time, and then naturally cooling to room temperature to obtain a heat-treated catalyst PTFE coated film.

[0037] Preferably, the inert gas is nitrogen or argon, the heat treatment temperature is 180℃-250℃, and the heat treatment time is 20-60min.

[0038] S30, the catalyst PTFE coating film and the proton exchange membrane are prepared into a catalyst proton membrane transfer layer by hot pressing transfer printing.

[0039] Specifically, the step S30 further comprises:

[0040] The catalyst PTFE coating film after heat treatment and the proton exchange membrane are prepared into a catalyst proton membrane transfer layer by hot pressing transfer printing; the temperature of the hot pressing transfer printing is 120-160℃, and the pressure of the hot pressing transfer printing is 1-5MPa.

[0041] S40, the catalyst proton membrane transfer layer is subjected to protonation treatment to obtain a catalyst proton membrane coating.

[0042] Specifically, the step S40 further comprises:

[0043] The catalyst proton membrane transfer layer is subjected to protonation treatment to exchange sodium ions in the catalyst proton membrane transfer layer into hydrogen ions, thereby obtaining a catalyst proton membrane coating (Carbon-Coated Membrane, CCM); the catalyst proton membrane coating is a thin film coated with a layer of carbon catalyst on the surface of the membrane, which is commonly used in the field of electrochemistry such as hydrogen fuel cells and chlor-alkali electrolysis cells, and is used to improve the activity and stability of the catalyst.

[0044] Specifically, the step of subjecting the catalyst proton membrane transfer layer to protonation treatment specifically comprises:

[0045] S401, the catalyst proton membrane transfer layer is immersed in a 0.1-1mol / L H2SO4 solution, soaked at 50-80℃ for 20-40min, then taken out and immersed in deionized water;

[0046] S402, the catalyst proton membrane transfer layer is air-dried at room temperature and subjected to gradient drying treatment at 60-100℃ to obtain a catalyst proton membrane coating.

[0047] Correspondingly, the application also provides a catalyst proton membrane coating prepared by the catalyst proton membrane coating preparation method of any one of the above.

[0048] Correspondingly, the application further provides a membrane electrode, comprising the catalyst proton membrane coating, the frame film and the gas diffusion layer as above, and the catalyst proton membrane coating, the frame film and the gas diffusion layer are sequentially attached.

[0049] Correspondingly, the application further provides a fuel cell comprising the membrane electrode as above.

[0050] The preparation method of the catalyst proton membrane coating provided by the application replaces the hydrogen type resin with the sodium type resin for preparing the catalyst proton membrane coating, utilizes the good heat stability of the sodium type resin, and improves the crystallinity of the perfluorosulfonic acid resin in the catalyst proton membrane coating by subsequent heat treatment of the catalyst slurry, thereby solving the problem of low resin crystallinity caused by direct use of the hydrogen type resin for preparing the membrane electrode. As known, during the operation of the fuel cell, strong oxidative oxygen radicals are generated in the catalyst proton membrane coating, the oxygen radicals attack the side chain groups of the perfluorosulfonic acid resin in the catalyst proton membrane coating, and the proton conduction structure is damaged. The improvement of the crystallinity of the resin in the catalyst proton membrane coating can effectively improve the anti-radical oxidative corrosion resistance, and ensure the stability of the three-phase reaction sites in the catalyst proton membrane coating, thereby improving the anti-radical corrosion resistance and durability of the membrane electrode. Moreover, the method provided by the application does not need to introduce any other additives, and does not have the problems of additive agglomeration, loss, and influence of the additives on the performance of the catalyst. Through the improvement of the application, the crystallinity of the perfluorosulfonic acid resin in the catalyst proton membrane coating can be effectively improved, and the anti-oxidative corrosion performance and durability of the membrane electrode can be improved.

[0051] The technical solutions of the application will be further described in combination with specific embodiments.

[0052] Embodiment 1

[0053] The embodiment 1 provides a preparation method of a catalyst proton membrane coating resistant to radicals, comprising the following steps:

[0054] In step one, 10 ml of a sodium type perfluorosulfonic acid resin solution is added to a water-alcohol dispersion liquid of a Pt / C catalyst, the I / C ratio (mass ratio of ionomer to C) is fixed as 0.8, and the catalyst slurry is uniformly dispersed by fully stirring;

[0055] In step two, the catalyst slurry is coated on a PTFE membrane by means of blade coating, the coating thickness is 100 μm, the catalyst PTFE coating membrane is transferred to an inert atmosphere sintering box after drying at room temperature, inert gas is introduced to fully remove air, heating is started to heat to 230℃, and the temperature is kept for 60 min, and then the temperature is naturally lowered to room temperature, thereby obtaining the heat-treated catalyst PTFE coating membrane;

[0056] Step three, two pieces of the catalyst PTFE coating film after heat treatment and proton exchange membrane are prepared into catalyst proton membrane transfer layer by hot transfer printing, wherein the temperature of the hot transfer printing is 150 DEG C, the transfer pressure is 2 MPa, and the transfer time is 3 min; the catalyst proton membrane transfer layer obtained after the transfer is immersed in 0.5 mol / L H2SO4, taken out after soaking at 60 DEG C for 30 min, and then soaked in deionized water; then the catalyst proton membrane transfer layer is air-dried at room temperature, and then subjected to gradient drying treatment at 60-100 DEG C, thereby obtaining the catalyst proton membrane coating.

[0057] Further, the catalyst proton membrane coating after protonation treatment is further sealed with a frame and pasted with carbon paper to obtain a free radical resistant membrane electrode.

[0058] Example 2

[0059] The example 2 provides a preparation method of a free radical resistant catalyst proton membrane coating, comprising the following steps:

[0060] Step one, 10 ml of sodium type perfluorosulfonic acid resin solution is added to the water-alcohol dispersion liquid of Pt / C catalyst, the I / C ratio (mass ratio of ionomer to C) is fixed at 0.8, and the catalyst slurry is uniformly dispersed by fully stirring;

[0061] Step two, the catalyst slurry is coated on the PTFE film by means of blade coating, the coating thickness is 100 μm, and the catalyst PTFE coating film is transferred to an inert atmosphere sintering box after drying at room temperature, inert gas is introduced to fully remove air, heating is started to 180 DEG C, and the temperature is kept for 60 min, then the temperature is naturally lowered to room temperature, thereby obtaining the catalyst PTFE coating film after heat treatment;

[0062] Step three, two pieces of the catalyst PTFE coating film after heat treatment and proton exchange membrane are prepared into catalyst proton membrane transfer layer by hot transfer printing, wherein the temperature of the hot transfer printing is 150 DEG C, the transfer pressure is 2 MPa, and the transfer time is 3 min; the catalyst proton membrane transfer layer obtained after the transfer is immersed in 0.5 mol / L H2SO4, taken out after soaking at 60 DEG C for 30 min, and then soaked in deionized water; then the catalyst proton membrane transfer layer is air-dried at room temperature, and then subjected to gradient drying treatment at 60-100 DEG C, thereby obtaining the catalyst proton membrane coating.

[0063] Further, the catalyst proton membrane coating after protonation treatment is further sealed with a frame and pasted with carbon paper to obtain a free radical resistant membrane electrode.

[0064] Example 3

[0065] The example 3 provides a preparation method of a free radical resistant catalyst proton membrane coating, comprising the following steps:

[0066] Step one, 10ml sodium type perfluorosulfonic acid resin solution is added to the water-alcohol dispersion of Pt / C catalyst, the I / C ratio (mass ratio of ionomer to C) is fixed at 0.8, and the catalyst slurry is dispersed by stirring to obtain a uniform catalyst slurry;

[0067] Step two, the catalyst slurry is coated on the PTFE film by means of scraping, the coating thickness is 100μm, and after drying at room temperature, the catalyst PTFE coating film is transferred to an inert atmosphere sintering box, inert gas is introduced to fully remove air, heating is started to 250℃, and after keeping for 60min, natural cooling is carried out to room temperature, and the heat-treated catalyst PTFE coating film is obtained.

[0068] Step three, two pieces of heat-treated catalyst PTFE coating film and proton exchange film are prepared into catalyst proton film transfer layer by hot pressing transfer printing, wherein the hot transfer printing temperature is 150℃, the transfer printing pressure is 2MPa, and the transfer printing time is 3min; the obtained catalyst proton film transfer layer is immersed in 0.5mol / L H2SO4, and after soaking at 60℃ for 30min, it is taken out and then soaked in deionized water; then the catalyst proton film transfer layer is air dried at room temperature, and then gradient drying treatment at 60-100℃ is carried out, and the catalyst proton film coating is obtained.

[0069] Further, the catalyst proton film coating after protonation treatment is further edge sealed and carbon paper is attached to obtain a free radical resistant membrane electrode.

[0070] Comparative Example 1:

[0071] The present comparative example provides a preparation method of a free radical resistant catalyst proton film coating, comprising the following steps:

[0072] Step one, 10ml hydrogen type perfluorosulfonic acid resin solution is added to the water-alcohol dispersion of Pt / C catalyst, the I / C ratio is fixed at 0.8, and the catalyst slurry is dispersed by stirring to obtain a uniform catalyst slurry;

[0073] Step two, the catalyst slurry is coated on the PTFE film by means of scraping, the coating thickness is 100μm, and after drying at room temperature, the catalyst PTFE coating film is obtained.

[0074] Step three, two pieces of catalyst PTFE coating film after room temperature drying treatment and proton exchange film are prepared into CCM (catalyst proton film coating) by hot pressing transfer printing, the hot transfer printing temperature is 150℃, the transfer printing pressure is 2MPa, and the transfer printing time is 3min.

[0075] Further, the CCM is further edge sealed and carbon paper is attached to obtain a free radical resistant membrane electrode.

[0076] Referring to FIG. 2 and FIG. 3, FIG. 2 is a scanning electron microscope picture of the surface microstructure of the catalyst proton membrane coating layer prepared in Example 1 of the present application, and FIG. 3 is a scanning electron microscope picture of the surface microstructure of the conventional catalyst proton membrane coating layer prepared in Comparative Example 1 of the present application; by comparing FIG. 2 with FIG. 3, it can be seen that the catalyst proton membrane coating layers of the two have similar structures, and the catalyst particles and the resin form a cluster structure, and the voids in and between the clusters form the pore structure of the catalyst proton membrane coating layer. This shows that the heat treatment of the catalyst PTFE coating layer and the subsequent protonation treatment of the catalyst proton membrane transfer layer in Example 1 do not affect the structure of the catalyst proton membrane coating layer.

[0077] Further, referring to FIG. 4, FIG. 4 is a schematic diagram of the comparison results of the I-V curve tests of Example 1 and Comparative Example 1 of the present application; from the I-V curve test results of Example 1 and Comparative Example 1 in FIG. 4, it can be seen that the performance curves of the membrane electrodes obtained by the two preparation methods are almost coincident, which shows that the heat treatment of the catalyst PTFE coating layer and the subsequent protonation treatment of the catalyst proton membrane transfer layer in Example 1 do not change the microstructure of the catalyst proton membrane coating layer of the membrane electrode, nor do they affect the performance of the membrane electrode.

[0078] When characterizing the free radical resistance of the membrane electrode, the open circuit voltage test method (OCV) is usually used for accelerated verification, because a large number of oxygen free radicals are generated under open circuit conditions, and the oxidation and corrosion speed of the catalyst layer resin is the fastest.

[0079] Referring to Table 1, Table 1 compares the key performance parameters representing the state of the catalyst layer, such as the performance and electrochemical active area of the membrane electrode prepared in Example 1 and Comparative Example 1 before and after OCV test.

[0080] Table 1

[0081] Specifically, it can be seen from Table 1 that the initial performance and electrochemical active area of the membrane electrode (Example 1) after the catalytic layer resin is heat treated to improve the crystallinity are similar to those of the comparative example membrane electrode, proving that the treatment method of the example does not adversely affect the performance of the membrane electrode. After 300 h of open-circuit voltage accelerated corrosion test, it can be seen that the performance and electrochemical active area of the membrane electrode of Example 1 and Comparative Example 1 have decreased to different degrees, because the oxygen radicals generated in the open-circuit state attack the side chain groups of the perfluorosulfonic acid resin in the catalytic layer, and even destroy the main chain structure. The destruction of the side chain groups will affect the proton conduction efficiency of the catalytic layer, reduce the number of reaction sites, and cause the catalytic performance to decay. And the destruction of the main chain structure can even cause the loss of the catalyst and the destruction of the catalytic layer structure. However, it can be seen from the specific data that the electrochemical performance of the membrane electrode of Example 1 at various current densities and the decay of the electrochemical active area are significantly less than those of Comparative Example 1. This shows that the anti-radical oxidative corrosion resistance of the membrane electrode is significantly improved after the sodium-type resin is introduced and the crystallinity of the catalytic layer resin is improved by the heat treatment process. Higher resin crystallinity effectively slows down the corrosion rate of the side chain and main chain of the catalytic layer resin by oxygen radicals in the open-circuit state, thereby maximizing the protection of the three-phase reaction sites and catalyst cluster structure of the catalytic layer.

[0082] The above results show that by introducing sodium-type perfluorosulfonic acid resin into the catalyst slurry, using the high-temperature resistance of sodium-type perfluorosulfonic acid resin and its structural characteristics of improved crystallinity during high-temperature heat treatment, the problem of low crystallinity of hydrogen-type resin in the previous catalytic layer and poor resistance to oxidative corrosion is effectively improved. Through the treatment of the embodiment of the present application, a membrane electrode with resistance to radical oxidative corrosion is prepared without the need to additionally introduce an antioxidant additive, and without affecting the pore structure of the catalytic layer and the performance of the membrane electrode. The durability of the membrane electrode is effectively improved, and the corrosion of oxygen radicals on the catalytic layer during the operation of the fuel cell is effectively slowed down.

[0083] In conclusion, different from the prior art, the application provides a catalyst proton membrane coating and a preparation method thereof, and a membrane electrode and a fuel cell, and the preparation method comprises the following steps: firstly, sodium resin is added to a water-alcohol dispersion solution of a Pt / C catalyst, and is fully stirred and dispersed to obtain a catalyst slurry; secondly, the catalyst slurry is coated on a PTFE membrane, dried at room temperature, and then transferred to an inert atmosphere sintering box for heat treatment to obtain a catalyst PTFE coating membrane; thirdly, the catalyst PTFE coating membrane and a proton exchange membrane are prepared into a catalyst proton membrane transfer layer through a hot-press transfer printing method; and finally, the catalyst proton membrane transfer layer is subjected to protonation treatment to obtain the catalyst proton membrane coating.

[0084] It should be noted that each of the above embodiments belongs to the same inventive concept, and the description of each embodiment has its own emphasis, and the description of individual embodiments is not exhaustive.

[0085] The above embodiments only express the implementation of the application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are within the scope of protection of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A method for the preparation of a catalyst proton membrane coating, characterized in that, The preparation method comprises the following steps: S10, adding sodium type resin into water-alcohol dispersion liquid of Pt / C catalyst, fully stirring and dispersing to obtain catalyst slurry; S20, coating the catalyst slurry on PTFE film, drying at room temperature, and then transferring to inert atmosphere sintering box for heat treatment to obtain catalyst PTFE coating film; S30, preparing catalyst proton membrane transfer layer by heat pressing transfer method through the catalyst PTFE coating film and proton exchange membrane; S40, performing protonation treatment on the catalyst proton membrane transfer layer to obtain catalyst proton membrane coating. In the step S20, the heat treatment step comprises the following steps: transferring the PTFE film containing the catalyst slurry to the inert atmosphere sintering box, introducing inert gas to fully remove air, starting heating to a set temperature, keeping for a heat treatment time, and then naturally cooling to room temperature to obtain the heat-treated catalyst PTFE coating film; the inert gas is nitrogen or argon, the heat treatment temperature is 180-250℃, and the heat treatment time is 20-60min.

2. The method for preparing a catalyst protonic membrane coating according to claim 1, characterized in that, In the step S10, the sodium type resin is a sodium type perfluorosulfonic acid resin solution containing 5wt%-20wt% of sodium, and the ion exchange equivalent of the sodium type resin is 700-1100meq / g.

3. The method for preparing a catalyst protonic membrane coating according to claim 1, characterized in that, In the step S20, the thickness of the PTFE film is 100-300μm, and the temperature resistance range is 280-320℃.

4. The method for preparing a catalyst protonic membrane coating according to claim 1, characterized in that, In the step S30, the temperature of the heat pressing transfer method is 120-160℃, and the pressure of the heat pressing transfer method is 1-5MPa.

5. The method for preparing a catalyst protonic membrane coating according to claim 1, characterized in that, The step S40 specifically comprises the following steps: S401, immersing the catalyst proton membrane transfer layer in 0.1-1mol / L H2SO4 solution, soaking at 50-80℃ for 20-40min, then immersing in deionized water; S402, air-drying the catalyst proton membrane transfer layer at room temperature, and then performing gradient heating drying treatment at 60-100℃ to obtain catalyst proton membrane coating.

6. A catalyst proton membrane coating characterized by, The catalyst proton membrane coating is prepared by the preparation method of the catalyst proton membrane coating according to any one of claims 1-5.

7. A membrane electrode characterized by, The membrane electrode comprises the catalyst proton membrane coating, the frame film and the gas diffusion layer.

8. A fuel cell characterized by comprising: The membrane electrode comprises the catalyst proton membrane coating, the frame film and the gas diffusion layer.

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