Membrane electrode for electrochemical hydrogen pump and preparation method thereof

Abstract

The invention provides a membrane electrode for an electrochemical hydrogen pump and a preparation method of the membrane electrode, and belongs to the technical field of hydrogen separation and compression. The preparation method of the membrane electrode for the electrochemical hydrogen pump comprises the following steps: providing the gas diffusion layer; preparing a chemical deposition solution; immersing the gas diffusion layer in a chemical deposition solution and carrying out a reaction under a heating condition so as to grow a catalyst in situ on the surface and the interior of the gas diffusion layer in a redox deposition manner to obtain a membrane electrode precursor; the membrane electrode precursor and a proton membrane are assembled to obtain the membrane electrode for the electrochemical hydrogen pump, and the membrane electrode for the electrochemical hydrogen pump prepared through the method has the advantages that a catalyst is not prone to falling off, the catalytic efficiency of the catalyst is high, and an airflow channel path is short.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen separation and compression, and in particular to a membrane electrode for an electrochemical hydrogen pump and a preparation method thereof. Background Art

[0002] The electrochemical hydrogen pump is a device that achieves hydrogen separation and compression based on electrochemical principles. The specific process includes: passing a humid hydrogen mixture into the anode of the device, hydrogen forms hydrated protons under the action of a catalyst, and then recombines into hydrogen after passing through a proton membrane under the action of an electric field. Other gases are blocked by the proton membrane, thereby achieving the selective passage of hydrogen and at the same time achieving gas pressurization by using electric energy as a drive.

[0003] For electrochemical hydrogen pump devices, membrane electrodes are the core components for realizing functions. Membrane electrodes are usually composed of a gas diffusion layer, a catalyst layer and a proton membrane, and the performance of the gas diffusion layer and the catalyst layer directly affects the performance of the electrochemical hydrogen pump. Among them, the gas diffusion layer usually uses porous materials such as carbon cloth and titanium felt, and the catalyst layer is mainly formed by coating the corresponding slurry on the proton membrane and drying it. Limited by the existing preparation process and structure of the membrane electrode, the membrane electrode in the existing electrochemical hydrogen pump has problems such as easy detachment of the catalyst, low catalytic efficiency of the catalyst, and long gas flow channel path, which in turn affects the service life and working efficiency of the electrochemical hydrogen pump. Summary of the invention

[0004] The purpose of the present application is to provide a membrane electrode for an electrochemical hydrogen pump and a preparation method thereof. The membrane electrode for an electrochemical hydrogen pump prepared by this method has the advantages that the catalyst is not easy to fall off, the catalytic efficiency of the catalyst is high, and the air flow channel path is short.

[0005] The embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a method for preparing a membrane electrode for an electrochemical hydrogen pump, comprising the following steps: providing a gas diffusion layer; preparing a chemical deposition liquid; immersing the gas diffusion layer in the chemical deposition liquid and reacting under heating conditions so as to in situ grow a catalyst on the surface and inside of the gas diffusion layer by redox deposition to obtain a membrane electrode precursor; assembling the membrane electrode precursor and a proton membrane to obtain a membrane electrode for an electrochemical hydrogen pump.

[0007] In the above technical solution, the gas diffusion layer is immersed in a chemical deposition liquid so that the surface and the porous channels inside the gas diffusion layer are fully infiltrated and filled with the chemical deposition liquid, so that the catalyst can be grown in situ on the surface and inside of the gas diffusion layer by redox deposition, so that the catalyst and the gas diffusion layer are fused into a whole, and then assembled on this basis to obtain a membrane electrode for an electrochemical hydrogen pump. This preparation process has many advantages: first, since the catalyst is grown in situ on the gas diffusion layer, the gas diffusion layer has a strong fixing and binding effect on the catalyst, so that the catalyst is not easy to fall off during the operation of the electrochemical hydrogen pump (there is a large pressure in the electrochemical hydrogen pump during operation); second, compared with the conventional preparation process, the gas diffusion layer and the catalyst layer are in a layered distribution form (the path of the air flow channel is longer), and the preparation process provided by the present application integrates the catalyst layer and the gas diffusion layer into a whole, which can shorten the path of the air flow channel, thereby reducing the adverse effects of hydrogen accumulation at the junction of different functional layers on the electrochemical hydrogen pump; third, compared with the traditional wet coating and drying preparation process, part of the catalyst in the catalyst layer formed therein will be wrapped by auxiliary materials (such as binders), and the active sites cannot be exposed, resulting in difficulty in exerting the catalytic effect, which in turn leads to poor catalytic efficiency. The preparation process provided by the present application will not introduce auxiliary materials into the catalyst, so that the formed catalyst can be fully utilized, that is, it has a higher catalytic efficiency. Therefore, the preparation method provided in the present application can make the prepared membrane electrode for electrochemical hydrogen pump have the advantages of catalyst not being easy to fall off, high catalytic efficiency of the catalyst and short air flow channel path.

[0008] In some optional embodiments, the step of preparing the chemical deposition liquid includes: adding a platinum salt, a reducing agent and a stabilizer into water and mixing them, wherein the reducing agent includes at least one of hypophosphite, ascorbic acid and glucose, and the stabilizer includes ammonia water and ammonium chloride, to obtain a mixed solution; and then adjusting the pH of the mixed solution to 9-10 with a pH adjusting agent to obtain a chemical deposition liquid.

[0009] In the above technical scheme, in the step of preparing the chemical deposition liquid, at least one of hypophosphite, ascorbic acid and glucose with relatively suitable reducing properties is used, a mixed system of ammonia water and ammonium chloride is used as a stabilizer, and the pH of the chemical deposition liquid is adjusted within a specific range. The chemical deposition liquid has the advantages of a relatively suitable reaction rate and a relatively thorough reaction during the redox deposition process, so that platinum ions can be fully converted into a catalytic elemental Pt.

[0010] In some optional embodiments, in the chemical deposition solution, the molar concentration ratio of Pt ions to the reducing agent is 1:(1-2).

[0011] In the above technical solution, the molar concentration ratio of Pt ions and reducing agent in the chemical deposition solution is limited to a specific range, so that the amount of reducing agent is more appropriate, which helps to fully convert expensive Pt ions into elemental Pt and is not likely to cause waste of raw materials.

[0012] In some optional embodiments, the molar concentration of Pt ions in the chemical deposition solution is 0.01 to 0.5 mol / L.

[0013] In the above technical solution, the molar concentration of Pt ions in the chemical deposition solution is limited to a specific range so that a relatively appropriate amount of catalyst can be loaded on the gas diffusion layer, thereby making the membrane electrode have relatively excellent catalytic performance during operation.

[0014] In some optional embodiments, in the chemical deposition liquid, the volume concentration of ammonia water is 30-120 mL / L, and / or the mass concentration of ammonium chloride is 5-25 g / L.

[0015] In the above technical solution, the volume concentration of ammonia water and the mass concentration of ammonium chloride in the chemical deposition solution are respectively limited within specific ranges, so that the reaction system is relatively stable, thereby facilitating the smooth progress of the redox reaction.

[0016] In some optional embodiments, in the step of immersing the gas diffusion layer in the chemical deposition liquid and reacting under heating conditions, the reaction temperature is 50 to 80° C. and the reaction time is 10 to 60 min.

[0017] In the above technical solution, the temperature and time of the heating treatment are limited to specific ranges, which can provide more suitable conditions for redox deposition, thereby helping to more thoroughly convert the Pt ions in the chemical deposition solution into elemental Pt.

[0018] In some optional embodiments, the gas diffusion layer is prepared by the following steps: dissolving starch and / or cellulose in water to obtain a slurry; filtering the slurry and drying the retentate to obtain a gas diffusion layer precursor; transferring the gas diffusion layer to a tubular furnace and calcining it under an inert atmosphere to obtain a gas diffusion layer.

[0019] In the above technical solution, starch and / or cellulose with self-crosslinking properties (spontaneously undergoing crosslinking reaction after being added to water) is used as the raw material of the gas diffusion layer, and then filtered and calcined (carbonizing the material to form a high-strength carbon skeleton) to prepare the gas diffusion layer. The gas diffusion layer prepared by this process has a relatively rich three-dimensional mesh porous structure, which is convenient for subsequent in-situ loading of catalysts, and also has relatively excellent self-supporting performance, so that it can better withstand pressure during the operation of the electrochemical hydrogen pump, which also helps to improve the problem of easy detachment of the catalyst.

[0020] In some optional embodiments, the solid content of the slurry is 20-250 g / L; and / or, in the filtering step, the pore size of the filter membrane is 0.5-2 μm.

[0021] In the above technical scheme, the solid content in the slurry is limited within a specific range so that the slurry has an appropriate concentration, which helps the raw materials to cross-link with each other; in the filtration treatment step, the pore size of the filter membrane is limited within a specific range, which can intercept the raw materials with longer chain segments and larger molecular weight after cross-linking, thereby helping to form a film on the surface of the filter membrane.

[0022] In some optional embodiments, in the calcination step, the treatment temperature is 300-900° C., and the treatment time is 1-6 hours.

[0023] In the above technical solution, the treatment temperature and treatment time in the calcination step are limited to specific ranges, respectively, which can provide more suitable carbonization conditions, so that a skeleton with a higher degree of carbonization can be prepared.

[0024] In a second aspect, an embodiment of the present application provides a membrane electrode for an electrochemical hydrogen pump, which is prepared by the preparation method of a membrane electrode for an electrochemical hydrogen pump provided in the embodiment of the first aspect.

[0025] In the above technical solution, the membrane electrode for electrochemical hydrogen pump is prepared by the preparation method of the membrane electrode for electrochemical hydrogen pump provided by the first embodiment, which has the advantages that the catalyst is not easy to fall off, the catalytic efficiency of the catalyst is high, and the air flow channel path is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1A process flow chart of a method for preparing a membrane electrode for an electrochemical hydrogen pump provided in an embodiment of the present application;

[0028] Figure 2 An electron microscope image of the gas diffusion layer obtained after calcination provided in the embodiment of the present application;

[0029] Figure 3 This is a physical picture of the membrane electrode precursor after redox deposition;

[0030] Figure 4 for Figure 3 Electron microscope image of . DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0032] It should be noted that “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three situations of “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”.

[0033] In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" in "one or more" refers to two or more; the range of "value a ~ value b" includes the two end values ​​"a" and "b", and the "unit" in "value a ~ value b + unit of measurement" represents the "unit of measurement" of both "value a" and "value b".

[0034] The membrane electrode for the electrochemical hydrogen pump and the preparation method thereof according to the embodiment of the present application are described in detail below.

[0035] In a first aspect, an embodiment of the present application provides a method for preparing a membrane electrode for an electrochemical hydrogen pump, comprising the following steps: providing a gas diffusion layer; preparing a chemical deposition liquid; immersing the gas diffusion layer in the chemical deposition liquid and reacting under heating conditions so as to in situ grow a catalyst on the surface and inside of the gas diffusion layer by redox deposition to obtain a membrane electrode precursor; assembling the membrane electrode precursor and a proton membrane to obtain a membrane electrode for an electrochemical hydrogen pump.

[0036] It should be noted that "in situ growth of catalyst on the surface and inside of the gas diffusion layer" means that any area of ​​the gas diffusion layer that can be contacted by the chemical deposition liquid will serve as a growth substrate for the catalyst, and then a catalyst layer is formed in the corresponding area through redox deposition.

[0037] In the present application, the gas diffusion layer is immersed in a chemical deposition liquid so that the surface and the porous channels inside the gas diffusion layer are fully infiltrated and filled with the chemical deposition liquid, so that the catalyst can be in situ grown on the surface and inside the gas diffusion layer by redox deposition, thereby fusing the catalyst and the gas diffusion layer into a whole, and then assembling on this basis to obtain a membrane electrode for an electrochemical hydrogen pump. This preparation process has many advantages: first, since the catalyst is grown in situ on the gas diffusion layer, the gas diffusion layer has a strong fixing and binding effect on the catalyst, so that the catalyst is not easy to fall off during the operation of the electrochemical hydrogen pump (there is a large pressure in the electrochemical hydrogen pump during operation); second, compared with the conventional preparation process, the gas diffusion layer and the catalyst layer are in a layered distribution form (the path of the air flow channel is longer), and the preparation process provided by the present application integrates the catalyst layer and the gas diffusion layer into a whole, which can shorten the path of the air flow channel, thereby reducing the adverse effects of hydrogen accumulation at the junction of different functional layers on the electrochemical hydrogen pump; third, compared with the traditional wet coating and drying preparation process, part of the catalyst in the catalyst layer formed therein will be wrapped by auxiliary materials (such as binders), and the active sites cannot be exposed, resulting in difficulty in exerting the catalytic effect, which in turn leads to poor catalytic efficiency. The preparation process provided by the present application will not introduce auxiliary materials into the catalyst, so that the formed catalyst can be fully utilized, that is, it has a higher catalytic efficiency. Therefore, the preparation method provided in the present application can make the prepared membrane electrode for electrochemical hydrogen pump have the advantages of catalyst not being easy to fall off, high catalytic efficiency of the catalyst and short air flow channel path.

[0038] As an example, the steps of preparing the chemical deposition liquid include: adding platinum salt, a reducing agent and a stabilizer into water and mixing them, wherein the reducing agent includes at least one of hypophosphite, ascorbic acid and glucose, and the stabilizer includes ammonia water and ammonium chloride, to obtain a mixed solution; then adjusting the pH of the mixed solution to 9-10 with a pH adjuster to obtain a chemical deposition liquid.

[0039] In this embodiment, in the step of preparing the chemical deposition liquid, at least one of hypophosphite, ascorbic acid and glucose with relatively suitable reducing properties is used, a mixed system of ammonia water and ammonium chloride is used as a stabilizer, and the pH of the chemical deposition liquid is adjusted within a specific range. The chemical deposition liquid has the advantages of a relatively suitable reaction rate and a more thorough reaction during the redox deposition process, so that platinum ions can be fully converted into a catalytic elemental Pt.

[0040] It should be noted that the type of platinum salt is not limited as long as it can provide Pt ions. For example, the platinum salt includes at least one of potassium chloroplatinate, platinum nitrate and platinum chloride.

[0041] It should be noted that the type of reducing agent is not limited, and the reducing agent may be one or more of hypophosphite, ascorbic acid and glucose, for example, sodium hypophosphite.

[0042] It should be noted that the type of pH adjuster is not limited, and it can be sodium hydroxide, for example.

[0043] It is understandable that, since Pt is a precious metal, the cost of its corresponding raw materials is relatively expensive. In order to reduce the preparation cost, the dosage ratio of Pt ions and the corresponding reducing agent can be adjusted.

[0044] As an example, in the chemical deposition solution, the molar concentration ratio of Pt ions and reducing agent is 1:(1-2), for example, but not limited to, the molar concentration ratio is any one of 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9 and 1:2 or a range between any two of them.

[0045] In this embodiment, the molar concentration ratio of Pt ions and reducing agent in the chemical deposition solution is limited to a specific range so that the amount of reducing agent used is more appropriate, which helps to fully convert expensive Pt ions into elemental Pt without causing much waste of raw materials.

[0046] As an example, in the chemical deposition solution, the molar concentration of Pt ions is 0.01 to 0.5 moL / L, for example but not limited to any one of 0.01 moL / L, 0.02 moL / L, 0.03 moL / L, 0.04 moL / L and 0.05 moL / L, or a range between any two of the molar concentrations.

[0047] In this embodiment, the molar concentration of Pt ions in the chemical deposition solution is limited to a specific range so that a relatively appropriate amount of catalyst can be loaded on the gas diffusion layer, thereby making the membrane electrode have relatively excellent catalytic performance during operation.

[0048] As an example, in the chemical deposition liquid, the volume concentration of ammonia water is 30 to 120 mL / L, for example but not limited to the volume concentration of 30 mL / L, 60 mL / L, 80 mL / L, 100 mL / L and 120 mL / L, or a range between any two of them; and / or, the mass concentration of ammonium chloride is 5 to 25 g / L, for example but not limited to the volume concentration of 5 g / L, 10 g / L, 15 g / L, 20 g / L and 25 g / L, or a range between any two of them.

[0049] In this embodiment, the volume concentration of ammonia water and the mass concentration of ammonium chloride in the chemical deposition solution are respectively limited to specific ranges, so that the reaction system is relatively stable, thereby facilitating the redox reaction to proceed smoothly.

[0050] As an example, in the step of immersing the gas diffusion layer in the chemical deposition liquid and reacting under heating conditions, the reaction temperature is 50-80°C, for example but not limited to the reaction temperature being any one of 50°C, 60°C, 70°C and 80°C or a range between any two of them; the reaction time is 10-60min, for example but not limited to the reaction time being any one of 10min, 20min, 30min, 40min, 50min and 60min or a range between any two of them.

[0051] In this embodiment, the temperature and time of the heating treatment are limited to specific ranges, respectively, which can provide more suitable conditions for redox deposition, thereby facilitating a more thorough conversion of Pt ions in the chemical deposition solution into elemental Pt.

[0052] As an example, the gas diffusion layer is prepared by the following steps: dissolving starch and / or cellulose in water to obtain a slurry; filtering the slurry and drying the retentate to obtain a gas diffusion layer precursor; transferring the gas diffusion layer to a tubular furnace and calcining it under an inert atmosphere to obtain a gas diffusion layer.

[0053] In this embodiment, starch and / or cellulose with self-crosslinking properties (spontaneously undergoing crosslinking reaction after being added to water) is used as the raw material of the gas diffusion layer, and then filtered and calcined (carbonizing the material to form a high-strength carbon skeleton) to prepare the gas diffusion layer. The gas diffusion layer prepared by this process has a relatively rich three-dimensional mesh porous structure, which is convenient for subsequent in-situ loading of catalysts, and also has relatively excellent self-supporting performance, so that it can better withstand pressure during the operation of the electrochemical hydrogen pump, which also helps to improve the problem of easy detachment of the catalyst.

[0054] As an example, in the slurry, the solid content is 20-250 g / L, for example but not limited to any point value among 20 g / L, 50 g / L, 100 g / L, 150 g / L, 200 g / L and 250 g / L, or a range value between any two of them; and / or, in the filtration treatment step, the pore size of the filter membrane is 0.5-2 μm, for example but not limited to any point value among 0.5 μm, 1 μm, 1.5 μm and 2 μm, or a range value between any two of them.

[0055] In this embodiment, the solid content in the slurry is limited within a specific range so that the slurry has an appropriate concentration, which helps the raw materials to cross-link with each other; in the filtration treatment step, the pore size of the filter membrane is limited within a specific range, which can intercept the raw materials with longer chain segments and larger molecular weight after cross-linking, thereby helping to form a film on the surface of the filter membrane.

[0056] As an example, in the calcination step, the treatment temperature is 300-900°C, for example but not limited to the treatment temperature is any one of 300°C, 400°C, 500°C, 600°C, 700°C, 800°C and 900°C or a range between any two of them; the treatment time is 1-6h, for example but not limited to the treatment time is any one of 1h, 2h, 3h, 4h, 5h and 6h or a range between any two of them.

[0057] In this embodiment, the treatment temperature and treatment time in the calcination step are limited to specific ranges, respectively, which can provide more suitable carbonization conditions, so that a skeleton with a higher degree of carbonization can be prepared.

[0058] It should be noted that the type of proton membrane is not limited, and commercial proton membranes currently available on the market can be directly selected, such as Nafion series membranes, Flemion series membranes or Aciplex series membranes.

[0059] It should be noted that any process or step not specifically described or limited in the preparation process of the membrane electrode for the electrochemical hydrogen pump may be arranged according to conventional selection in the art.

[0060] As an example, the process flow chart of the preparation method of the membrane electrode for electrochemical hydrogen pump is shown in Figure 1 .

[0061] In a second aspect, an embodiment of the present application provides a membrane electrode for an electrochemical hydrogen pump, which is prepared by the preparation method of a membrane electrode for an electrochemical hydrogen pump provided in the embodiment of the first aspect.

[0062] In the present application, the membrane electrode for electrochemical hydrogen pump is prepared by the preparation method of the membrane electrode for electrochemical hydrogen pump provided by the first embodiment, which has the advantages that the catalyst is not easy to fall off, the catalytic efficiency of the catalyst is high, and the air flow channel path is short.

[0063] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0064] Example 1

[0065] The present invention provides a method for preparing a membrane electrode for an electrochemical hydrogen pump, comprising the following steps:

[0066] The starch is dissolved in water to obtain a slurry, wherein the solid content of the slurry is 100 g / L; the slurry is then filtered using a Ninon filter membrane with a pore size of 1 μm to obtain a film-like interception on the surface of the filter membrane, and then the film-like interception is dried at 80° C. to obtain a gas diffusion layer precursor.

[0067] The gas diffusion layer precursor was clamped by two graphite clamps arranged opposite to each other, and then transferred to a tubular furnace and calcined in a nitrogen atmosphere, wherein the treatment temperature was 600° C. and the treatment time was 3 h, to obtain a gas diffusion layer.

[0068] The gas diffusion layer cooled to room temperature was immersed in a chemical deposition solution and then reacted at 70°C for 30 minutes. The composition of the chemical deposition solution was: 5 g / L potassium chloroplatinate, 1.3 g / L sodium hypophosphite, 80 mL / L ammonia water, and 15 g / L ammonium chloride. The pH of the chemical deposition solution was adjusted to pH 9 using sodium hydroxide so that a catalyst could be in situ grown on the surface and inside of the gas diffusion layer by redox deposition to obtain a membrane electrode precursor.

[0069] Two membrane electrode precursors and a commercial proton membrane are assembled to obtain a membrane electrode for an electrochemical hydrogen pump.

[0070] In order to better understand and illustrate the feasibility of the technical solution provided in the embodiments of the present application, the following is an auxiliary explanation combined with pictures of the membrane electrode at different stages.

[0071] See also Figure 2 , Figure 3 and Figure 4 ,in, Figure 2 This is an electron microscope image of the gas diffusion layer obtained after calcination. Figure 3 This is a physical picture of the membrane electrode precursor after redox deposition. Figure 4 for Figure 3 Electron microscope image of Figure 2 to Figure 4 It can be seen that by preparing according to the preparation process provided in the embodiment of the present application, a membrane electrode in which the catalyst and the gas diffusion layer are integrated can be prepared. It is speculated that the membrane electrode for the electrochemical hydrogen pump can have the advantages of the catalyst not being easy to fall off, the catalyst having a higher catalytic efficiency and a shorter gas flow channel path.

[0072] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

Claims

1. A method for preparing a membrane electrode for an electrochemical hydrogen pump, characterized in that: The following steps are involved: providing a gas diffusion layer; Prepare chemical deposition solution; Immersing the gas diffusion layer in the chemical deposition solution and reacting under heating conditions, so as to in-situ grow a catalyst on the surface and inside of the gas diffusion layer by redox deposition to obtain a membrane electrode precursor; The membrane electrode precursor and the proton membrane are assembled to obtain a membrane electrode for an electrochemical hydrogen pump.

2. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to claim 1, characterized in that: The step of configuring the chemical deposition solution comprises: Platinum salt, a reducing agent and a stabilizer are added into water and mixed, wherein the reducing agent comprises at least one of hypophosphite, ascorbic acid and glucose, and the stabilizer comprises ammonia water and ammonium chloride, to obtain a mixed solution; and then the pH of the mixed solution is adjusted to 9-10 with a pH adjusting agent to obtain a chemical deposition solution.

3. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to claim 2, characterized in that: In the chemical deposition solution, the molar concentration ratio of Pt ions to reducing agent is 1:(1-2).

4. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to claim 3, characterized in that: In the chemical deposition solution, the molar concentration of the Pt ions is 0.01 to 0.5 moL / L.

5. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to claim 2, characterized in that: In the chemical deposition liquid, the volume concentration of the ammonia water is 30 to 120 mL / L, and / or the mass concentration of the ammonium chloride is 5 to 25 g / L.

6. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to claim 2, characterized in that: In the step of immersing the gas diffusion layer in the chemical deposition solution and reacting under heating conditions, the reaction temperature is 50 to 80° C. and the reaction time is 10 to 60 minutes.

7. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to any one of claims 1 to 6, characterized in that: The gas diffusion layer is prepared by the following steps: dissolving starch and / or cellulose in water to obtain a slurry; filtering the slurry and drying the retentate to obtain a gas diffusion layer precursor; The gas diffusion layer is transferred to a tube furnace and calcined under an inert atmosphere to obtain the gas diffusion layer.

8. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to claim 7, characterized in that: In the slurry, the solid content is 20 to 250 g / L; And / or, in the filtering step, the pore size of the filter membrane is 0.5 to 2 μm.

9. The method for preparing a membrane electrode for an electrochemical hydrogen pump according to claim 7, characterized in that: In the calcination step, the treatment temperature is 300-900° C. and the treatment time is 1-6 hours.

10. A membrane electrode for an electrochemical hydrogen pump, characterized in that: The membrane electrode for an electrochemical hydrogen pump is prepared by the preparation method according to any one of claims 1 to 9.

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