Catalyst slurry and preparation method thereof, PEM electrolytic hydrogen production membrane electrode and preparation method thereof
By using a catalyst slurry of long-side branched resin ion solution on the cathode side of the proton exchange membrane to produce hydrogen electrolytic, the problem of excessive hydrogen content in oxygen is solved, which improves safety and reduces the preparation cost.
Patent Information
- Application Number
- CN202411502841.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-02-18
AI Technical Summary
During the hydrogen production process of proton exchange membrane electrolysis, the content of hydrogen in oxygen is often too high, resulting in the risk of explosion. Existing methods such as increasing the hydrogen removal layer of precious metals has limited effect and increase cost.
Using a catalyst slurry composed of a cathode catalyst, a long-branched resin ion solution and a dispersant, the side chain characteristics of the resin ion solution are adjusted to reduce hydrogen permeability by using the catalyst slurry on the cathode side of the proton exchange membrane. .
The content of hydrogen in oxygen during electrolysis of the membrane electrode is effectively reduced, safety is improved, and the preparation cost of the membrane electrode is controlled without increasing the precious metal hydrogen removal layer.
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Abstract
Description
Technical Field
[0001] The present invention relates to the field of membrane electrode technology, and in particular to a catalyst slurry and a preparation method thereof, a PEM electrolysis hydrogen production membrane electrode and a preparation method thereof. Background Art
[0002] When producing hydrogen by proton exchange membrane (PEM) electrolysis, the hydrogen content in oxygen will cause an explosion when it reaches a certain limit. Therefore, the hydrogen content in oxygen is a key parameter in the preparation of membrane electrodes. When membrane electrodes prepared by traditional membrane electrode preparation methods produce hydrogen by electrolysis, the hydrogen content in oxygen is often too high. At present, some membrane electrodes will add a layer of precious metal dehydrogenation layer in the anode catalyst layer or the cathode catalyst layer to solve the problem of excessive hydrogen in oxygen. However, the method of adding a dehydrogenation layer has limited effect and will increase the preparation cost of the membrane electrode. Summary of the invention
[0003] The problem solved by the present invention is how to effectively solve the problem of excessively high hydrogen content in oxygen during hydrogen production by proton exchange membrane electrolysis.
[0004] In order to solve the above problems, the present invention provides a catalyst slurry and a preparation method thereof, a PEM electrolysis hydrogen production membrane electrode and a preparation method thereof.
[0005] In a first aspect, the present invention provides a catalyst slurry comprising a cathode catalyst, a resin ion solution with long side branches and a dispersant, wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≧400 g / mol.
[0006] Optionally, the long side-branched resin in the long side-branched resin ion solution is a perfluorosulfonic acid resin having long side-branched chains composed of perfluorovinyl ether sulfonate groups.
[0007] Optionally, the dispersant is one or more of deionized water, isopropanol, ethylene glycol, and ethanol.
[0008] In a second aspect, the present invention provides a method for preparing a catalyst slurry, which is used to prepare the catalyst slurry as described above, comprising the following steps: mixing a cathode catalyst, a resin ion solution with long side branches and a dispersant, and performing a dispersion treatment to obtain a catalyst slurry; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≧400 g / mol.
[0009] Optionally, the dispersion treatment includes one or more of ball milling, homogenization, shearing, and ultrasound.
[0010] In a third aspect, the present invention provides a PEM electrolysis hydrogen production membrane electrode, comprising a proton exchange membrane, a catalyst slurry being thermally transferred on the surface of the proton exchange membrane, the catalyst slurry being prepared by mixing and dispersing a cathode catalyst, a resin ion solution with long side branches and a dispersant; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≧400 g / mol.
[0011] Optionally, an anode catalyst slurry is thermally transferred onto the other side of the proton exchange membrane surface, and the anode catalyst slurry is prepared by mixing and dispersing an anode catalyst, a resin ion solution with short side branches and a dispersant; wherein the molar mass of the short side branch monomer of the resin ion solution with short side branches is ≤300g / mol.
[0012] Optionally, the long side branched resin in the long side branched resin ion solution is a perfluorosulfonic acid resin with long side branches composed of perfluorovinyl ether sulfonate groups, and the short side branched resin in the short side branched resin ion solution is a perfluorosulfonic acid resin with short side branches composed of perfluorosulfonate groups.
[0013] In a fourth aspect, the present invention provides a method for preparing a PEM electrolysis hydrogen production membrane electrode, which is used to prepare the PEM electrolysis hydrogen production membrane electrode as described above, comprising the following steps:
[0014] The catalyst slurry and the anode catalyst slurry are respectively coated on the transfer substrate, wherein the catalyst slurry is prepared by mixing and dispersing the cathode catalyst, the resin ion solution with long side branches and the dispersant; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≥ 400 g / mol;
[0015] The surface of the transfer substrate coated with the catalyst slurry is attached to the surface of the proton exchange membrane, and the surface of the transfer substrate coated with the anode catalyst slurry is attached to the other side relative to the proton exchange membrane surface, and thermal transfer is performed to obtain a PEM electrolysis hydrogen production membrane electrode.
[0016] Optionally, the transfer substrate is Teflon cloth, polytetrafluoroethylene film or polyvinyl chloride film; during the thermal transfer process, the temperature is 110-180° C., the pressure is 2-10 N / m, and the holding time is 2-10 min.
[0017] The catalyst slurry and preparation method thereof, PEM electrolysis hydrogen production membrane electrode and preparation method thereof of the present invention have the following beneficial effects: the difference in the side chain length of the resin ion solution will significantly affect the microstructure of the resin, and the ion cluster size of the resin with a long side chain having the same EW value is smaller than that of the resin with a short side chain, and its corresponding hydrogen permeability is relatively small. By using a catalyst slurry composed of a resin ion solution with a long side branch on the cathode side of the proton exchange membrane (PEM), the hydrogen permeability can be reduced, thereby reducing the hydrogen content in oxygen during membrane electrode electrolysis hydrogen production, avoiding excessive hydrogen content in oxygen, and improving safety. At the same time, under the condition of not adding any precious metal dehydrogenation layer and process, the hydrogen permeability can be reduced by adjusting the side chain characteristics of the resin ion solution, and the preparation cost of the membrane electrode can be effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The graph is a test curve of hydrogen in oxygen for the PEM electrolysis hydrogen production membrane electrode prepared in Example 1 and Comparative Example 1 and Comparative Example 2;
[0019] Figure 2 It is a curve chart of the polarization performance test of the PEM electrolysis hydrogen production membrane electrode prepared in Example 1 and Comparative Example 1 and Comparative Example 2. DETAILED DESCRIPTION
[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.
[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application;
[0022] The term "including" and its variations used in this article are open inclusions, that is, "including but not limited to"; the term "based on" is "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first" and "second" mentioned in the present invention are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more.
[0023] In the related art, the difference in the length of the side chain of the ion solution resin will significantly affect the microstructure of the resin. Sou YM, Kimble MC, White R E. Hydrogen diffusion, solubility, and water uptake in Dow's short-side-chain perfluorocarbon membranes [J]. J. Electrochem. Soc., 1992, 139: 1913-1917 reported that the ion cluster size of the long side chain resin with the same EW value is smaller than that of the short side chain, and its corresponding hydrogen permeability is relatively small. At the same time, the reduction in the side chain length gives the polymer a lower ion exchange equivalent mass and higher proton conductivity.
[0024] When preparing membrane electrodes, in order to improve the adhesion between the catalyst and the proton membrane and improve the proton transfer efficiency, an ion dispersion solution needs to be added. In the traditional membrane electrode preparation, the cathode and anode are not specifically distinguished when using the ion dispersion solution, and the same type of ion solution is selected, which results in the inability to give full play to their corresponding characteristics.
[0025] In view of the problems existing in the above-mentioned related technologies, the present embodiment provides a catalyst slurry and a preparation method thereof, a PEM electrolysis hydrogen production membrane electrode and a preparation method thereof.
[0026] A catalyst slurry provided in an embodiment of the present invention comprises a cathode catalyst, a resin ion solution with long side branches and a dispersant, wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≥400 g / mol.
[0027] In this embodiment, the difference in the side chain length of the resin ion solution will significantly affect the microstructure of the resin. The ion cluster size of the resin with a long side chain having the same EW value is smaller than that of the resin with a short side chain, and its corresponding hydrogen permeability is relatively small. By using a catalyst slurry composed of a resin ion solution with a long side branch on the cathode side of the proton exchange membrane (PEM), the hydrogen permeability can be reduced, thereby reducing the hydrogen content in oxygen during hydrogen production by membrane electrode electrolysis, avoiding excessive hydrogen content in oxygen, and improving safety. At the same time, under the condition of not adding any noble metal dehydrogenation layer and process, the hydrogen permeability can be reduced by adjusting the side chain characteristics of the resin ion solution, and the preparation cost of the membrane electrode can be effectively controlled.
[0028] Specifically, the cathode catalyst is one or more of a platinum-carbon catalyst, a platinum-cobalt catalyst, and a platinum-nickel catalyst.
[0029] Specifically, the concentration of the long side chain branched resin ion solution is 5%, 10% or 25%.
[0030] Optionally, the long side-branched resin in the long side-branched resin ion solution is a perfluorosulfonic acid resin having long side-branched chains composed of perfluorovinyl ether sulfonate groups.
[0031] Optionally, the dispersant is one or more of deionized water, isopropanol, ethylene glycol, and ethanol.
[0032] A method for preparing a catalyst slurry provided in an embodiment of the present invention is used to prepare the catalyst slurry as described above, comprising the following steps: mixing a cathode catalyst, a resin ion solution with long side branches and a dispersant, and performing a dispersion treatment to obtain a catalyst slurry; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≧400 g / mol.
[0033] In this embodiment, the preparation method is simple. By using a catalyst slurry composed of a resin ion solution with long side branches on the cathode side of the proton exchange membrane (PEM), the hydrogen permeability can be reduced, thereby reducing the hydrogen content in oxygen during membrane electrode electrolysis to produce hydrogen, avoiding excessive hydrogen content in oxygen and improving safety.
[0034] Optionally, the dispersion treatment includes one or more of ball milling, homogenization, shearing, and ultrasound.
[0035] A PEM electrolysis hydrogen production membrane electrode provided by an embodiment of the present invention includes a proton exchange membrane, a catalyst slurry is thermally transferred on the surface of the proton exchange membrane, and the catalyst slurry is prepared by mixing and dispersing a cathode catalyst, a resin ion solution with long side branches and a dispersant; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≧400g / mol.
[0036] In this embodiment, a resin ion solution with long side branches is used on the cathode side of the PEM electrolytic hydrogen production membrane electrode, which can reduce the hydrogen content in oxygen during electrolytic hydrogen production and improve safety.
[0037] Optionally, an anode catalyst slurry is thermally transferred onto the other side of the proton exchange membrane surface, and the anode catalyst slurry is prepared by mixing and dispersing an anode catalyst, a resin ion solution with short side branches and a dispersant; wherein the molar mass of the short side branch monomer of the resin ion solution with short side branches is ≤300g / mol.
[0038] In this optional embodiment, the reduction in side chain length gives the polymer a lower ion exchange equivalent mass and higher proton conductivity. By using a resin ion solution with short side branches on the anode side of the PEM electrolysis hydrogen production membrane electrode, the proton transfer efficiency can be improved and the performance of the membrane electrode can be improved. A differentiated matching scheme of ion solutions is implemented during the preparation of the membrane electrode, and catalyst slurries with different ion solution systems are configured on the anode side and the cathode side. This reduces the hydrogen content in oxygen during the electrolysis hydrogen production process while improving the performance of the membrane electrode, which has positive significance for the preparation of the PEM electrolysis hydrogen production membrane electrode.
[0039] Specifically, the anode catalyst is iridium oxide, iridium black / iridium oxide mixture or rhenium oxide.
[0040] Specifically, the concentration of the short side branched resin ion solution is 5%, 10% or 25%.
[0041] Specifically, the catalyst loading of the PEM electrolysis hydrogen membrane electrode is 0.8-1.2 mg / cm 2 , cathode 0.3-0.5mg / cm 2 The selection of the catalyst loading makes the overall performance and stability of the PEM electrolysis hydrogen membrane electrode excellent.
[0042] Optionally, the long side branched resin in the long side branched resin ion solution is a perfluorosulfonic acid resin with long side branches composed of perfluorovinyl ether sulfonate groups, and the short side branched resin in the short side branched resin ion solution is a perfluorosulfonic acid resin with short side branches composed of perfluorosulfonate groups.
[0043] In this optional embodiment, a differentiated matching scheme is implemented, and catalyst slurries of different ion solution systems are configured on the anode side and the cathode side, thereby reducing the hydrogen content in oxygen while improving the performance of the PEM electrolysis hydrogen production membrane electrode.
[0044] A method for preparing a PEM electrolysis hydrogen production membrane electrode provided in an embodiment of the present invention is used to prepare the PEM electrolysis hydrogen production membrane electrode as described above, comprising the following steps:
[0045] The catalyst slurry and the anode catalyst slurry are coated on the transfer substrate respectively, wherein the catalyst slurry is prepared by mixing and dispersing the cathode catalyst, the resin ion solution with long side branches and the dispersant; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≥400 g / mol;
[0046] The surface of the transfer substrate coated with the catalyst slurry is attached to the surface of the proton exchange membrane, and the surface of the transfer substrate coated with the anode catalyst slurry is attached to the other side relative to the proton exchange membrane surface, and thermal transfer is performed to obtain a PEM electrolysis hydrogen production membrane electrode.
[0047] In the present embodiment, when preparing the membrane electrode, in order to improve the adhesion between the catalyst and the proton membrane and improve the proton transfer efficiency, it is necessary to add an ion dispersion solution. The difference in the length of the side chain of the ion solution resin will significantly affect the microstructure of the resin. The ion cluster size of the long side chain resin with the same EW value is smaller than that of the short side chain, and its corresponding hydrogen permeability is relatively small. By using a catalyst slurry composed of a resin ion solution with long side branches on the cathode side of the proton exchange membrane (PEM), the hydrogen permeability can be reduced, and then the content of hydrogen in oxygen during the electrolysis of the membrane electrode to reduce hydrogen, avoid excessive hydrogen content in oxygen, and improve safety. At the same time, under the conditions of the hydrogen removal layer and process without adding any precious metal, the hydrogen permeability can be reduced by adjusting the side chain characteristics of the resin ion solution, and the preparation cost of the membrane electrode can be effectively controlled. The reduction of the side chain length gives the polymer a lower ion exchange equivalent mass and a higher proton conductivity. By using a resin ion solution with short side branches on the anode side, the proton transfer efficiency can be improved and the performance of the membrane electrode can be improved. In the traditional membrane electrode preparation, the cathode and anode are not specifically distinguished when the ion dispersion liquid is used, and the same type of ion solution is selected, which results in the inability to give full play to their corresponding characteristics. In this embodiment, the influence of the ion solution on the catalytic layer during the preparation of the existing membrane electrode is improved, and a differentiated matching scheme is achieved. The catalyst slurry of different ion solution systems is configured on the anode side and the cathode side, which reduces the hydrogen content in oxygen during the electrolytic hydrogen production process and improves the performance of the membrane electrode, which has positive significance for the preparation of PEM electrolytic hydrogen production membrane electrode.
[0048] Optionally, the transfer substrate is Teflon cloth, polytetrafluoroethylene film or polyvinyl chloride film; during the thermal transfer process, the temperature is 110-180° C., the pressure is 2-10 N / m, and the holding time is 2-10 min.
[0049] Specifically, the catalyst slurry or anode catalyst slurry is coated on the transfer substrate by spraying, slit coating or doctor blade coating.
[0050] Specifically, the prepared anode catalyst slurry / catalyst slurry is coated on the transfer substrate, and then the proton exchange membrane is sandwiched between two layers of transfer substrates with anode catalyst slurry and catalyst layer slurry, with the side with anode catalyst slurry or catalyst slurry facing the proton exchange membrane to form a sandwich structure, which is placed in a transfer jig and transferred to a thermal transfer device. A certain temperature of 110-180°C, pressure of 2-10N / m and holding time of 2-10min are set, and the hot pressing is completed and taken out to realize the preparation of the PEM electrolysis hydrogen production membrane electrode catalyst layer.
[0051] The present invention is further described below in conjunction with specific embodiments.
[0052] Embodiment 1, the preparation method of PEM electrolysis hydrogen production membrane electrode comprises the following steps:
[0053] 1. Measure 0.5g of anode catalyst iridium oxide, 0.005g of 10% short side branched perfluorosulfonic acid resin ion solution, and dispersant isopropanol, wherein the solid content of the dispersant in the mixture is 5%;
[0054] 2. Dispersing the mixed catalyst slurry to obtain anode catalyst slurry;
[0055] 3. Measure 0.2 g of cathode catalyst platinum carbon catalyst, 0.002 g of 10% long side branched perfluorosulfonic acid resin ion solution, and dispersant isopropanol, and the solid content of the dispersant in the mixture is 5%;
[0056] 4. Dispersing the mixed catalyst slurry to obtain cathode catalyst slurry;
[0057] 5. Spray the anode catalyst slurry onto the substrate Teflon cloth;
[0058] 6. Spray the cathode catalyst slurry onto the substrate Teflon cloth;
[0059] 7. Sandwich the proton exchange membrane between two layers of transfer substrates with catalytic layer slurry, with the side with catalyst slurry facing the proton exchange membrane to form a sandwich structure, put it into the transfer jig, transfer it to the hot press of the thermal transfer equipment, set the temperature to 150°C, the pressure to 6N / m and the holding time to 6min, take it out after the hot pressing is completed, and obtain the PEM electrolysis hydrogen production membrane electrode.
[0060] Comparative Example 1, a method for preparing a PEM electrolysis hydrogen production membrane electrode, comprising the following steps:
[0061] 1. Measure 0.5g of anode catalyst iridium oxide, 0.005g of 10% long side branched perfluorosulfonic acid resin ion solution, and dispersant isopropanol, wherein the solid content of the dispersant in the mixture is 5%;
[0062] 2. Dispersing the mixed catalyst slurry to obtain anode catalyst slurry;
[0063] 3. Measure 0.2 g of cathode catalyst platinum carbon catalyst, 0.002 g of 10% long side branched perfluorosulfonic acid resin ion solution, and dispersant isopropanol, and the solid content of the dispersant in the mixture is 5%;
[0064] 4. Dispersing the mixed catalyst slurry to obtain cathode catalyst slurry;
[0065] 5. Spray the anode catalyst slurry onto the substrate Teflon cloth;
[0066] 6. Spray the cathode catalyst slurry onto the substrate Teflon cloth;
[0067] 7. Sandwich the proton exchange membrane between two layers of transfer substrates with catalytic layer slurry, with the side with catalyst slurry facing the proton exchange membrane to form a sandwich structure, put it into the transfer jig, transfer it to the hot press of the thermal transfer equipment, set the temperature to 150°C, the pressure to 6N / m and the holding time to 6min, take it out after the hot pressing is completed, and obtain the PEM electrolysis hydrogen production membrane electrode.
[0068] Comparative Example 2, a method for preparing a PEM electrolysis hydrogen production membrane electrode, comprising the following steps:
[0069] 1. Measure 0.5g of anode catalyst iridium oxide, 0.005g of 10% short side branched perfluorosulfonic acid resin ion solution, and dispersant isopropanol, wherein the solid content of the dispersant in the mixture is 5%;
[0070] 2. Dispersing the mixed catalyst slurry to obtain anode catalyst slurry;
[0071] 3. Measure 0.2 g of cathode catalyst platinum carbon catalyst, 0.002 g of 10% short side branched perfluorosulfonic acid resin ion solution, and dispersant isopropanol, and the solid content of the dispersant in the mixture is 5%;
[0072] 4. Dispersing the mixed catalyst slurry to obtain cathode catalyst slurry;
[0073] 5. Spray the anode catalyst slurry onto the substrate Teflon cloth;
[0074] 6. Spray the cathode catalyst slurry onto the substrate Teflon cloth;
[0075] 7. Sandwich the proton exchange membrane between two layers of transfer substrates with catalytic layer slurry, with the side with catalyst slurry facing the proton exchange membrane to form a sandwich structure, put it into the transfer jig, transfer it to the hot press of the thermal transfer equipment, set the temperature to 150°C, the pressure to 6N / m and the holding time to 6min, take it out after the hot pressing is completed, and obtain the PEM electrolysis hydrogen production membrane electrode.
[0076] Effect Example
[0077] The PEM electrolysis hydrogen production membrane electrodes prepared in Example 1, Comparative Example 1 and Comparative Example 2 were subjected to oxygen hydrogen test and polarization performance test respectively. Figure 1 The polarization performance test results are shown in Figure 2 shown.
[0078] Depend on Figure 1 It can be seen that the horizontal axis is the current density Current (A / cm 2 ), the vertical axis is the hydrogen content H in oxygen 2 / O 2 (%), the cathode of Example 1 adopts a membrane electrode of a resin ion solution with long side branches, and the membrane electrode of Comparative Example 2 selects a resin ion solution with short side branches. The curve of Example 1 is below that of Comparative Example 2, and it can be seen that the content of hydrogen in oxygen in Example 1 is lower than that in Comparative Example 2. It can be seen that selecting a resin ion solution with long side branches at the cathode can reduce the content of hydrogen in oxygen during hydrogen electrolysis.
[0079] Depend on Figure 2 It can be seen that the horizontal axis is the current density Current (A / cm 2 ), the ordinate is the voltage value Voltage (V). For PEM electrolysis hydrogen production, the stronger the membrane electrode performance is, the lower the voltage is when the current density is the same, and the stronger the membrane electrode performance is. Figure 2 From the polarization curve diagram, it can be seen that the performance of the resin ion solution with short side branches selected as the anode in Example 1 is higher than that of the resin membrane electrode with long side branches selected as the anode in Comparative Example 1. It can be seen that the resin ion solution with short side branches selected as the anode is beneficial to improving the performance of the membrane electrode.
[0080] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.
Claims
1. A catalyst slurry, characterized in that: The invention comprises a cathode catalyst, a resin ion solution with long side branches and a dispersant, wherein the molar mass of a long side branch monomer of the resin ion solution with long side branches is greater than or equal to 400 g / mol.
2. The catalyst slurry according to claim 1, characterized in that The long side-branched resin in the long side-branched resin ion solution is a perfluorosulfonic acid resin whose long side-branched chains are composed of perfluorovinyl ether sulfonic acid radicals.
3. The catalyst slurry according to claim 1, characterized in that The dispersant includes one or more of deionized water, isopropanol, ethylene glycol, and ethanol.
4. A method for preparing a catalyst slurry, for preparing the catalyst slurry according to any one of claims 1 to 3, characterized in that: The following steps are involved: The cathode catalyst, the resin ion solution with long side branches and the dispersant are mixed and dispersed to obtain the catalyst slurry; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≥400 g / mol.
5. The method for preparing the catalyst slurry according to claim 4, characterized in that: The dispersion treatment includes one or more of ball milling, homogenization, shearing, and ultrasound.
6. A PEM electrolysis hydrogen production membrane electrode, characterized in that: It comprises a proton exchange membrane, the surface of which is thermally transferred with a catalyst slurry, the catalyst slurry being prepared by mixing and dispersing a cathode catalyst, a resin ion solution with long side branches and a dispersant; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≥400 g / mol.
7. The PEM electrolysis hydrogen production membrane electrode according to claim 6, characterized in that: An anode catalyst slurry is thermally transferred on the other side of the proton exchange membrane surface. The anode catalyst slurry is prepared by mixing and dispersing an anode catalyst, a resin ion solution with short side branches and a dispersant. The molar mass of the short side branch monomer of the resin ion solution with short side branches is ≤300g / mol.
8. The PEM electrolysis hydrogen production membrane electrode according to claim 7, characterized in that: The long side branched resin in the long side branched resin ion solution is a perfluorosulfonic acid resin with long side branches composed of perfluorovinyl ether sulfonic acid groups, and the short side branched resin in the short side branched resin ion solution is a perfluorosulfonic acid resin with short side branches composed of perfluorosulfonic acid groups.
9. A method for preparing a PEM electrolytic hydrogen production membrane electrode, used for preparing the PEM electrolytic hydrogen production membrane electrode as claimed in any one of claims 6 to 8, characterized in that: The following steps are involved: The catalyst slurry and the anode catalyst slurry are respectively coated on the transfer substrate, wherein the catalyst slurry is prepared by mixing and dispersing the cathode catalyst, the resin ion solution with long side branches and the dispersant; wherein the molar mass of the long side branch monomer of the resin ion solution with long side branches is ≥ 400 g / mol; The surface of the transfer substrate coated with the catalyst slurry is attached to the surface of the proton exchange membrane, and the surface of the transfer substrate coated with the anode catalyst slurry is attached to the other side relative to the surface of the proton exchange membrane, and thermal transfer is performed to obtain the PEM electrolysis hydrogen production membrane electrode.
10. The method for preparing a PEM electrolysis hydrogen production membrane electrode according to claim 9, characterized in that: The transfer substrate is Teflon cloth, polytetrafluoroethylene film or polyvinyl chloride film; during the thermal transfer process, the temperature is 110-180° C., the pressure is 2-10 N / m, and the pressure holding time is 2-10 min.