Preparation method of hydrogen evolution electrode and alkaline electrolyzer

Abstract

This application provides a method for preparing a hydrogen evolution electrode and an alkaline electrolyzer, relating to the field of energy materials technology. The method for preparing the hydrogen evolution electrode includes the following steps: mixing nickel powder with a first metal powder other than nickel powder to form a powder mixture; spraying the powder mixture onto the surface of a second metal substrate to form a first structure; etching the first structure to form a porous second structure with a first specific surface area; wherein the first specific surface area ranges from 5 to 20 μm². 2 / m 2 The second structure is placed in a third metal salt solution, a reducing agent is added, and the reaction is carried out at a first temperature for a first time until a first thickness is reached, thus forming a hydrogen evolution electrode. This method for preparing the hydrogen evolution electrode significantly reduces hydrogen production energy consumption, exhibits good stability, is simple in process, low in cost, easy to industrialize, and has high market value.

Description

Technical Field

[0001] This application relates to the field of energy materials technology, and in particular to a method for preparing a hydrogen evolution electrode and an alkaline electrolyzer. Background Technology

[0002] With the development of science and technology, hydrogen energy has been increasingly researched and applied. The rapid development of hydrogen fuel cells and other technologies has fully demonstrated the feasibility of hydrogen energy as a secondary energy source. Hydrogen energy has many sources, among which water electrolysis for hydrogen production is characterized by its green and environmentally friendly nature, flexible production, and high product purity. It is the main direction for hydrogen production from renewable energy sources such as photovoltaics and wind power. The rapid development of renewable energy and the continuous upgrading of materials technology have injected new vitality into the further development of water electrolysis for hydrogen production technology.

[0003] In water electrolysis for hydrogen production, alkaline electrolyzers are a commonly used type. However, alkaline electrolyzers have relatively low hydrogen production efficiency and relatively high energy consumption. Currently, the catalysts commonly used in alkaline electrolyzers are mostly nickel-based catalysts, such as pure nickel mesh, nickel foam, or a mixture of nickel, aluminum, and other powders sprayed onto a base. This results in poor stability of the catalytic electrode and a high hydrogen evolution overpotential, leading to high overall energy consumption in the water electrolysis process, which is not conducive to industrial production. Summary of the Invention

[0004] The embodiments of this application provide a method for preparing a hydrogen evolution electrode and an alkaline electrolyzer. The method for preparing the hydrogen evolution electrode significantly reduces hydrogen production energy consumption, has good stability, is simple in process, low in cost, easy to industrialize, and has high market value.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] On the one hand, a method for preparing a hydrogen evolution electrode is provided, comprising the following steps:

[0007] Nickel powder is mixed with a first metal powder other than the nickel powder to form a powder mixture;

[0008] The powder mixture is sprayed onto the surface of a second metal substrate to form a first structure;

[0009] The first structure is etched to form a porous second structure with a first specific surface area; wherein the first specific surface area ranges from 5 to 20 μm. 2 / m 2 ;

[0010] The second structure is placed in a third metal salt solution, a reducing agent is added, and the reaction is carried out at a first temperature for a first time until a first thickness is reached, thus forming the hydrogen evolution electrode.

[0011] Furthermore, the third metal salt solution includes multiple metals such as copper sulfate, nickel sulfate, copper nitrate, nickel nitrate, cobalt nitrate, and platinum nitrate.

[0012] Furthermore, the concentration range of the third metal salt solution is 1-30%.

[0013] Furthermore, the reducing agent includes at least one of sodium citrate, hydrazine hydrate, glucose, formaldehyde, and acetaldehyde.

[0014] Furthermore, the concentration range of the reducing agent is 5-50%.

[0015] Furthermore, the first temperature range is 10-80℃;

[0016] The first time range is 1-36 hours;

[0017] The first thickness range is 5-50 μm.

[0018] Further, the etching of the first structure to form a porous second structure with a first specific surface area includes:

[0019] The first structure is etched using an alkaline solution to form the porous second structure having a first specific surface area.

[0020] Furthermore, the concentration of the alkaline solution ranges from 5% to 60%.

[0021] Furthermore, the first metal powder includes any one of copper powder, molybdenum powder, gold powder, aluminum powder, and cobalt powder;

[0022] The ratio of the weight of the nickel powder to the weight of the first metal powder is in the range of 100:10 to 100:100.

[0023] On the other hand, an alkaline electrolyzer is provided, comprising a diaphragm, an anode, and a hydrogen evolution electrode obtained by the above-described method for preparing the hydrogen evolution electrode, wherein the diaphragm is located between the anode and the hydrogen evolution electrode.

[0024] This application provides a method for preparing a hydrogen evolution electrode, comprising the following steps: mixing nickel powder with a first metal powder other than nickel powder to form a powder mixture; spraying the powder mixture onto the surface of a second metal substrate to form a first structure; etching the first structure to form a porous second structure with a first specific surface area; wherein the first specific surface area ranges from 5 to 20 μm². 2 / m 2 The second structure is placed in a third metal salt solution, a reducing agent is added, and the reaction is carried out at a first temperature for a first time until a first thickness is reached, thus forming a hydrogen evolution electrode.

[0025] Therefore, by spraying a nickel-based catalyst onto the surface of a second metal substrate, followed by etching, a second structure with high specific surface area and porous / cracked structure is formed. Treatment with a third metal salt solution heals the porous / cracked structure, achieving high stability of the hydrogen evolution electrode. Finally, a thermal reduction reaction reduces the residual salt solution, resulting in a composite multi-element alloy on the surface of the second metal substrate. This method enables the fabrication of a low hydrogen evolution overpotential, highly stable hydrogen evolution electrode (catalytic electrode) containing multiple metal structures. The method significantly reduces hydrogen production energy consumption, exhibits good stability, is simple in process, and has low cost. Furthermore, it shows minimal attenuation during start-up and shutdown testing and solves the problem of oxidation shedding caused by reverse current. It is easy to industrialize and has significant potential application value and high market value.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 Cyclic voltammetry characterization of a hydrogen evolution electrode with low hydrogen evolution overpotential and high stability is provided for embodiments of this application.

[0029] Figure 2 SEM image of a hydrogen evolution electrode provided in an embodiment of this application. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0031] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc or abc, where a, b, and c can be single or multiple.

[0033] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0034] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0035] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass described in the embodiments of this application can be a mass unit known in the chemical industry, such as μg, mg, g, or kg.

[0036] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, "first XX" may also be referred to as "second XX," and similarly, "second XX" may also be referred to as "first XX." Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0037] In a first aspect, embodiments of this application provide a method for preparing a hydrogen evolution electrode.

[0038] The preparation method of this hydrogen evolution electrode includes the following steps:

[0039] S1. Mix nickel powder with a first metal powder other than nickel powder to form a powder mixture.

[0040] This application does not specifically limit the diameter range of the nickel powder. For example, the diameter range of the nickel powder can be 10-50 μm. Specifically, the diameter of the nickel powder can be 10 μm, 20 μm, 30 μm, 40 μm, or 50 μm, etc. This facilitates the spraying of the powder mixture onto the surface of the second metal substrate.

[0041] S2. Spray the powder mixture onto the surface of the second metal substrate to form the first structure.

[0042] S3. Etch the first structure to form a porous second structure with a first specific surface area.

[0043] The first specific surface area ranges from 5 to 20 m². 2 / m 2 .

[0044] This application does not specifically limit the first specific surface area mentioned above. For example, the first specific surface area can be 5m². 2 / m 2 10m 2 / m 2 15m 2 / m 2 Or 20m 2 / m 2 Wait a minute. The specific surface area is relatively high.

[0045] S4. The second structure is placed in a third metal salt solution, a reducing agent is added, and the reaction is carried out at a first temperature for a first time until a first thickness is reached, thus forming a hydrogen evolution electrode.

[0046] It should be noted that, after step S4 above, in which the second structure is placed in the third metal salt solution, a reducing agent is added, and the reaction is carried out at the first temperature for the first time to reach the first thickness and form the hydrogen evolution electrode, the preparation method further includes:

[0047] S5. Perform a secondary activation treatment on the hydrogen evolution electrode.

[0048] The aforementioned secondary activation treatment can refer to soaking in a 10% alkaline solution for 10 hours. This is beneficial for improving the performance of the hydrogen evolution electrode.

[0049] The above-mentioned method can heal the pores / cracks formed by spraying through a third metal salt solution, thereby achieving high stability of the hydrogen evolution electrode; and, a multi-element alloy coating is formed on the surface of the second metal substrate by chemical method, specifically by reduction method, to deposit multiple metal materials.

[0050] The method for preparing a hydrogen evolution electrode provided in this application involves spraying a nickel-based catalyst onto the surface of a second metal substrate; followed by etching to create a second structure with a high specific surface area and porous / cracked structures; then, treatment with a third metal salt solution to heal the porous / cracked structures formed by the spraying process, achieving high stability of the hydrogen evolution electrode; finally, a thermal reduction reaction is performed to reduce the residual salt solution, resulting in a composite multi-element alloy on the surface of the second metal substrate. This method achieves the preparation of a hydrogen evolution electrode (catalytic electrode) with low hydrogen evolution overpotential and high stability containing multiple metal structures.

[0051] Furthermore, the preparation method of this hydrogen evolution electrode significantly reduces hydrogen production energy consumption, has good stability, simple process, and low cost. Moreover, it has small attenuation during start-up and shutdown testing and can solve the problem of oxidation shedding caused by reverse current. It is easy to industrialize and has great potential application value and high market value.

[0052] In practical applications, the current density decay of the hydrogen evolution electrode described in this application is less than 5%, indicating that the hydrogen evolution electrode has high stability.

[0053] It should be noted that the hydrogen evolution electrode test described above is a dynamic current density decay test conducted 1000 times with a -1.5V start-stop cycle.

[0054] The hydrogen evolution overpotential of the hydrogen evolution electrode described in this application can be lower than 80 mV (η10 mA). Specifically, the low hydrogen evolution overpotential of the hydrogen evolution electrode can be 40 mV (η10 mA), 50 mV (η10 mA), 60 mV (η10 mA), 70 mV (η10 mA), etc.

[0055] The hydrogen production energy consumption of the hydrogen evolution electrode described in this application is less than 3.95 kWh / m³. 3 .

[0056] It should be noted that the hydrogen evolution electrode test described above was conducted in a 1 standard cubic meter electrolyzer at a temperature of 85±5℃ and a current density of 4000 A / m. 2 The energy consumption for hydrogen production.

[0057] Furthermore, the third metal salt solution includes multiple metals such as copper sulfate, nickel sulfate, copper nitrate, nickel nitrate, cobalt nitrate, and platinum nitrate.

[0058] It should be understood that the above-mentioned third metal salt solution includes multiple of copper sulfate, nickel sulfate, copper nitrate, nickel nitrate, cobalt nitrate, and platinum nitrate. This means that the third metal salt solution may include at least two of copper sulfate, nickel sulfate, copper nitrate, nickel nitrate, cobalt nitrate, and platinum nitrate; or, the third metal salt solution may include three or more of copper sulfate, nickel sulfate, copper nitrate, nickel nitrate, cobalt nitrate, and platinum nitrate. No specific limitation is made here.

[0059] It should be noted that the third metal salt solution can also be other metal salt solutions, without specific limitations. For example, the metal in the third metal salt solution can also be molybdenum, aluminum, iron, etc.

[0060] The copper sulfate, nickel sulfate, copper nitrate, nickel nitrate, cobalt nitrate, and platinum nitrate provided in this application are simple to obtain and are beneficial for chemical reduction coating on the surface of the second structure.

[0061] Furthermore, the concentration range of the third metal salt solution is 1-30%.

[0062] This application does not specifically limit the concentration of the third metal salt solution. For example, the concentration of the third metal salt solution may be 1%, 5%, 10%, 15%, 20%, or 30%, etc.

[0063] The concentration of the third metal salt solution provided in this application embodiment is within a suitable range, which is beneficial to obtaining a catalytic electrode with better performance, high stability, high surface activity, and low hydrogen evolution overpotential.

[0064] Furthermore, the reducing agent includes at least one of sodium citrate, hydrazine hydrate, glucose, formaldehyde, and acetaldehyde.

[0065] It should be understood that the reduction agent mentioned above includes at least one of sodium citrate, hydrazine hydrate, glucose, formaldehyde, and acetaldehyde, meaning that the reduction agent may include only one of sodium citrate, hydrazine hydrate, glucose, formaldehyde, and acetaldehyde; or, the reduction agent may include multiple of sodium citrate, hydrazine hydrate, glucose, formaldehyde, and acetaldehyde, without specific limitations here.

[0066] Of course, the reducing agent can also be a material; no specific limitations are made here.

[0067] The sodium citrate, hydrazine hydrate, glucose, formaldehyde, acetaldehyde, etc. provided in the embodiments of this application are simple and easy to obtain, and have a good reduction effect, which is beneficial for chemical reduction coating on the surface of the second structure.

[0068] Furthermore, the concentration of the reducing agent ranges from 5% to 50%.

[0069] This application does not specifically limit the concentration of the reducing agent. For example, the concentration of the reducing agent may be 5%, 10%, 20%, 30%, 40%, or 50%, etc.

[0070] The concentration of the reducing agent provided in the embodiments of this application is within a suitable range, which is beneficial to obtaining a catalytic electrode with better performance, high stability, high surface activity, and low hydrogen evolution overpotential.

[0071] Furthermore, the first temperature range is 10-80℃; the first time range is 1-36h; and the first thickness range is 5-50μm.

[0072] This application does not specifically limit the first temperature mentioned above. For example, the first temperature can be 10℃, 20℃, 30℃, 40℃, 60℃, or 80℃, etc.

[0073] This application does not specifically limit the first time mentioned above. For example, the first time can be 1h, 10h, 15h, 20h, 28h, or 36h, etc.

[0074] This application does not specifically limit the first thickness mentioned above. For example, the first thickness can be 5μm, 10μm, 20μm, 30μm, 40μm or 50μm, etc.

[0075] The first temperature, first time, and first thickness provided in the embodiments of this application are within a suitable range, which is beneficial to obtaining a catalytic electrode with better performance, high stability, high surface activity, and low hydrogen evolution overpotential.

[0076] Further, step S3 above, etching the first structure to form a porous second structure with a first specific surface area, includes:

[0077] S31. The first structure is etched using an alkaline solution to form a porous second structure with a first specific surface area, and then the structure is cleaned and dried.

[0078] This application does not specifically limit the type of alkaline solution mentioned above. For example, the alkaline solution may include sodium hydroxide (NaOH), etc.

[0079] The alkaline solution provided in this application embodiment can cause the second metal substrate with a powder mixture on its surface to have pores / cracks after etching, and increase its specific surface area, which is beneficial for subsequent chemical reduction coating.

[0080] Furthermore, the concentration of the alkaline solution ranges from 5% to 60%.

[0081] This application does not specifically limit the concentration of the alkaline solution. For example, the concentration of the alkaline solution may be 5%, 10%, 20%, 30%, 50%, or 60%, etc.

[0082] The concentration of the alkaline solution provided in the embodiments of this application is within a suitable range, which is beneficial to obtaining a catalytic electrode with better performance, high stability, high surface activity, and low hydrogen evolution overpotential.

[0083] Furthermore, the first metal powder includes any one of copper powder, molybdenum powder, gold powder, aluminum powder, and cobalt powder; the weight ratio of nickel powder to the weight of the first metal powder is in the range of 100:10 to 100:100.

[0084] Of course, the first metal powder can also be other metal powders, and no specific limitation is made here.

[0085] This application does not specifically limit the ratio of the weight of nickel powder to the weight of the first metal powder. For example, the ratio of the weight of nickel powder to the weight of the first metal powder can be 100:10, 100:20, 100:40, 100:60, 100:80, or 100:100, etc.

[0086] This application does not specifically limit the diameter range of the first metal powder. For example, the diameter range of the first metal powder can be 10-50 μm. Specifically, the diameter of the first metal powder can be 10 μm, 20 μm, 30 μm, 40 μm, or 50 μm, etc. This facilitates the spraying of the powder mixture onto the surface of the second metal substrate.

[0087] The ratio of the weight of nickel powder to the weight of the first metal powder provided in this application embodiment is within a suitable range, which is beneficial to obtaining a catalytic electrode with better performance, high stability, high surface activity, and low hydrogen evolution overpotential.

[0088] Further, step S2 above, spraying the powder mixture onto the surface of the second metal substrate to form the first structure, includes:

[0089] S21. A powder mixture is sprayed onto the surface of a second metal substrate using a plasma spraying process to form a first structure.

[0090] This application does not specifically limit the above-mentioned plasma spraying process. For example, the conditions for plasma spraying can be: the ratio of argon (Ar) to hydrogen (H2) in the spraying is 5:1.5, the spraying power is 28KW, the spraying distance is 15cm, the spraying speed is 250m / s, and the powder feeding rate is 150g / min.

[0091] This application does not specifically limit the plasma spraying described above. For example, plasma spraying can be any of atmospheric plasma spraying, vacuum plasma spraying, supersonic plasma spraying, etc.

[0092] The embodiments of this application employ a plasma spraying process, which enables the powder mixture to be sprayed more evenly onto the surface of the second metal substrate.

[0093] Furthermore, the second metal substrate may include any one of nickel sheet, nickel mesh, iron sheet, iron mesh, copper sheet, copper mesh, etc.

[0094] This application does not specifically limit the mesh count of the aforementioned nickel wire mesh, iron wire mesh, copper wire mesh, etc. For example, the mesh count range of nickel wire mesh, iron wire mesh, copper wire mesh, etc. can be 0.17-0.20. Specifically, the mesh count of nickel wire mesh, iron wire mesh, copper wire mesh, etc. can be 0.17, 0.18, 0.19, or 0.20, etc.

[0095] In practical applications, the surfaces of the aforementioned nickel sheets, nickel mesh, iron sheets, iron mesh, copper sheets, and copper mesh can be sandblasted and polished before plasma spraying.

[0096] It should be noted that when the second metal substrate is an iron sheet, the first metal powder includes at least iron powder.

[0097] The nickel sheets, nickel meshes, iron sheets, iron meshes, copper sheets, copper meshes, and other substrates provided in the embodiments of this application are simple and easy to implement.

[0098] Further, step S4 above, which involves placing the second structure in a third metal salt solution, adding a reducing agent, and reacting at a first temperature for a first time to reach a first thickness, thereby forming a hydrogen evolution electrode, includes:

[0099] S41. The second structure is placed in a third metal salt solution, a reducing agent is added, and the reaction is carried out at a first temperature for a first time until a first thickness is reached. Then, it is ultrasonically cleaned in pure water to form a hydrogen evolution electrode.

[0100] This application does not specifically limit the power of the ultrasonic cleaning process described above. For example, the power range of the ultrasonic cleaning process can be 30-1000W. Specifically, the power of the ultrasonic cleaning process can be 30W, 10W, 300W, 600W, 800W, or 1000W, etc.

[0101] This application does not specify the time for the ultrasonic cleaning process described above. For example, the ultrasonic cleaning time can range from 1 to 30 minutes. Specifically, the ultrasonic cleaning time can be 1 minute, 5 minutes, 10 minutes, 15 minutes, 20 minutes, or 30 minutes, etc.

[0102] Secondly, embodiments of this application provide a hydrogen evolution electrode, which is prepared by the above-described method for preparing a hydrogen evolution electrode.

[0103] The hydrogen evolution electrode provided in this application contains a variety of metals and has properties such as high stability, high surface activity, and low hydrogen evolution overpotential, which is beneficial for industrial applications.

[0104] Thirdly, embodiments of this application provide an alkaline electrolyzer, including a diaphragm, an anode, and a hydrogen evolution electrode obtained by the above-described hydrogen evolution electrode preparation method, wherein the diaphragm is located between the anode and the hydrogen evolution electrode.

[0105] It should be noted that alkaline electrolyzers may also include alkali removal solution and batteries.

[0106] This application does not specifically limit the alkaline solution mentioned above. For example, the alkaline solution can be 1M KOH, or other alkaline solutions, which are not specifically limited here.

[0107] The alkaline electrolyzer provided in this application embodiment exhibits excellent water electrolysis performance because the hydrogen evolution electrode used contains multiple metals and has properties such as high stability, high surface activity, and low hydrogen evolution overpotential.

[0108] The following specific embodiments illustrate the hydrogen evolution electrode, its preparation method, and its application according to the present application.

[0109] Example 1

[0110] The following is a hydrogen evolution electrode required, with a hydrogen evolution overpotential of 60±5mV (η10mA) and a current density decay of less than 3% after 1000 start-stop tests at 1.5V. The fabrication process of this hydrogen evolution electrode is as follows:

[0111] S01. Atmospheric plasma spraying process is adopted. The spraying conditions are as follows: argon to hydrogen ratio of 5:1.5, spraying power of 28KW, spraying distance of 15cm, spraying speed of 250m / s, powder feed rate of 150g / min, and nickel powder and aluminum powder with a diameter of 10μm are sprayed onto the surface of a 46-mesh 0.19 nickel mesh (surface sandblasted and polished). The spraying amount is 320g / m. 2 .

[0112] S02. Place the coated nickel mesh into a 25% sodium hydroxide solution at a temperature of 35°C, stir and let stand for 10 hours until no bubbles are generated, then remove it and clean the surface with pure water.

[0113] S03. Place the etched nickel mesh material into a solution containing cobalt nitrate (3%) and aluminum molybdate (20%) at a temperature of 10°C. Then add 10% hydrazine hydrate solution and react for 12 hours. After that, remove the nickel mesh and clean it.

[0114] S04. After drying the above nickel mesh, a multi-element catalytic electrode containing nickel, cobalt, molybdenum and aluminum on its surface can be obtained.

[0115] It should be noted that the above-mentioned catalytic electrode can undergo a secondary activation treatment before use, followed by cleaning and testing. This secondary activation treatment involves soaking the electrode in a 10% alkaline solution for 10 hours, which is beneficial for improving the performance of the catalytic electrode.

[0116] The catalytic electrode prepared in Example 1 was tested below, and the results were obtained. Figure 1Cyclic voltammetry characterization of the low hydrogen evolution overpotential and highly stable electrode. For example... Figure 1 As shown, the horizontal axis represents current (A) and the vertical axis represents voltage (V).

[0117] Depend on Figure 1 As can be seen, the catalytic electrode prepared in Example 1 has a low hydrogen evolution overpotential and high stability.

[0118] The surface of the catalytic electrode prepared in Example 1 was then tested using scanning electron microscopy (SEM), and the results were obtained. Figure 2 .

[0119] The hydrogen evolution overpotential, current density decay, current density, ultrasonic vibration loss, high current stability, and hydrogen production energy consumption of the catalytic electrode prepared in Example 1 were tested and obtained in Table 1 below.

[0120] Table 1

[0121]

[0122] As can be seen from Table 1 above, the catalytic electrode provided in Example 1 of this application has a low hydrogen evolution overpotential, a small current density decay, a small current density, a small ultrasonic vibration loss, is stable under high current, and has low hydrogen production energy consumption. The performance of this catalytic electrode is very good.

[0123] This application only describes the content related to the inventive point; the remaining structure can be obtained by referring to relevant technologies, and will not be described in detail here.

[0124] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application.

[0125] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for producing a hydrogen evolution electrode, characterized by, The method comprises the following steps: The atmospheric plasma spraying process is used, and the spraying conditions are as follows: the ratio of argon and hydrogen is 5:1.5 in spraying, the spraying power is 28 KW, the spraying distance is 15 cm, the spraying speed is 250 m / s, the powder feeding amount is 150 g / min, the nickel powder with a diameter of 10 μm and the aluminum powder with a diameter of 10 μm are sprayed to the surface of the nickel mesh with a mesh of 46, and the spraying amount is 320 g / m 2 ; The sprayed nickel mesh is placed in a 25% sodium hydroxide solution with a temperature of 35°C, and stirred for 10 hours until no bubbles are generated, and then taken out and cleaned with pure water; The etched nickel mesh material is placed in a solution containing cobalt nitrate and aluminum molybdate, with a solution temperature of 10°C, and then 10% hydrazine hydrate solution is added, and after 12 hours of reaction, the nickel mesh is taken out and cleaned; After drying the nickel mesh, a multi-element catalyzed hydrogen evolution electrode containing nickel, cobalt, molybdenum and aluminum on the surface is obtained.

2. An alkaline electrolyzer characterized by, A hydrogen evolution electrode obtained by the preparation method of the hydrogen evolution electrode as claimed in claim 1, comprising a diaphragm, an anode and the hydrogen evolution electrode. A hydrogen evolution electrode obtained by the preparation method of the hydrogen evolution electrode as claimed in claim 1, comprising a diaphragm, an anode and the hydrogen evolution electrode.

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