High-activity binary alloy hydrogen evolution electrode plate and preparation process method

Abstract

The invention belongs to the technical field of electrode plates, and particularly relates to a high-activity binary alloy hydrogen evolution electrode plate and a preparation process method. The preparation process method comprises the following steps: obtaining a metal nickel electrode substrate and white corundum sand with different particle sizes; carrying out cleaning treatment on the metal nickel initial electrode substrate; the pretreated metal nickel initial base body serves as a working electrode, and sand blasting pretreatment is conducted on a metal nickel electrode base body through white corundum sand; dust removal operation is conducted on the metal nickel electrode base body subjected to sand blasting pretreatment; and spraying binary metal alloy powder on the intermediate hydrogen evolution electrode plate through an atmospheric plasma spraying process to form the high-activity binary alloy hydrogen evolution electrode plate. The whole preparation process method sequentially comprises the steps of cleaning treatment, sand blasting pretreatment, atmospheric plasma spraying, natural cooling and the like, the process method for preparing the electrode plate is optimized, it is guaranteed that the electrode plate has excellent long-time hydrogen evolution stability when the electrode plate is subjected to a hydrogen evolution reaction, and the excellent hydrogen production effect can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrode plates, and in particular relates to a high-activity binary alloy hydrogen evolution electrode plate and a preparation method thereof. Background Art

[0002] With the growing global demand for clean energy, alkaline water electrolysis technology has received widespread attention as an efficient and environmentally friendly method of hydrogen production. As the core equipment of alkaline water electrolysis technology, the improvement of the performance of alkaline electrolyzers is of great significance for reducing the cost of hydrogen production and improving energy conversion efficiency. However, alkaline electrolyzers currently still have problems such as high energy consumption and low efficiency during operation, which limits their large-scale application. Since alkaline electrolyzers play an important role in fields such as hydrogen energy preparation, their performance improvement is crucial to promoting the development of related industries. As a key component of alkaline electrolyzers, electrode catalyst coatings play a decisive role in the efficiency and stability of electrolyzers. High-efficiency electrode catalyst coatings have become a hot topic of current research due to their good catalytic activity and stability.

[0003] As an important branch of thermal spraying technology, plasma spraying technology has shown great application potential in the field of alkaline water electrolysis. This technology uses a high-temperature plasma flame to heat the spraying material to a molten or semi-molten state, and sprays it onto the substrate surface at high speed to form a coating, which can effectively improve the performance of the electrode.

[0004] On the hydrogen evolution electrode plate used in water electrolysis to produce hydrogen, if the electrode catalyst coating is sprayed on the hydrogen evolution electrode plate by plasma spraying, the reaction rate of alkaline water electrolysis can be significantly improved. However, in an alkaline environment, the electrode coating needs to have good corrosion resistance and structural stability. Direct use of plasma spraying technology in alkaline water electrolysis still faces some challenges, such as the low structural stability of the electrode catalyst coating, which is easy to fall off, and the need for further optimization of uniformity and repeatability. The high temperature during the spraying process will have a certain negative impact on the electrode substrate material, resulting in poor catalytic stability of the electrode catalyst coating and reduced catalytic efficiency. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art of spraying electrode catalyst coatings on electrode plates using plasma spraying technology, such as uneven coating, low repeatability, and the impact of high temperature on the electrode substrate during the spraying process. A high-activity binary alloy hydrogen evolution electrode plate and a process for preparing the same are provided to solve the problem of poor stability of the catalyst on the surface of the hydrogen evolution electrode plate in the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] In one aspect of the present invention, a process for preparing a high-activity binary alloy hydrogen evolution electrode plate comprises the following:

[0008] (1) obtaining a metal nickel electrode substrate and white corundum sand of different particle sizes; and cleaning the metal nickel initial electrode substrate;

[0009] (2) using the pretreated nickel metal substrate as a working electrode, and performing sandblasting pretreatment on the nickel metal electrode substrate using the white corundum sand;

[0010] (3) performing dust removal on the metal nickel electrode substrate after sandblasting pretreatment until an intermediate hydrogen evolution electrode plate with no reflective bright spots at all angles is obtained;

[0011] (4) Using binary metal alloy powder as raw material, the binary metal alloy powder is sprayed onto the intermediate hydrogen evolution electrode plate through an atmospheric plasma spraying process, and is naturally cooled at room temperature to form a high-activity binary alloy hydrogen evolution electrode plate.

[0012] In addition, the method according to the above embodiment of the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, in step (1), the cleaning process of the metal nickel initial electrode substrate specifically includes:

[0014] The surface of the obtained metal nickel electrode substrate is rinsed with pure water.

[0015] In some embodiments of the present invention, in step (3), the dust removal operation on the metal nickel electrode substrate after sandblasting pretreatment specifically includes:

[0016] Dry compressed air is used to blow away the sand and dust attached to the surface of the pretreated metal nickel electrode substrate.

[0017] In some embodiments of the present invention, the binary alloy powder includes any one of nickel-cobalt alloy powder, nickel-copper alloy powder, nickel-iron alloy powder, nickel-tin alloy powder, nickel-molybdenum alloy powder, cobalt-iron alloy powder, cobalt-tin alloy powder, cobalt-copper alloy powder, and cobalt-molybdenum alloy powder;

[0018] Or / and, the mass ratio of the two metals in the binary metal powder is 1:1-4:1.

[0019] In some embodiments of the present invention, the particle size of the white corundum sand is 40-200 mesh.

[0020] In some embodiments of the present invention, the particle size of the alloy powder is 50-150 mesh.

[0021] In some embodiments of the present invention, in step (2), the sandblasting pretreatment includes the following parameter settings:

[0022] The injection pressure is 0.6-0.8Mpa;

[0023] and / or, blasting at an angle of 45°-90°

[0024] and / or, the electrode movement rate is 16-28 mm / s

[0025] And / or, the control cabinet voltage is 36V

[0026] In some embodiments of the present invention, in step (4), the parameters of the atmospheric plasma spraying process are set as follows:

[0027] Spraying distance is 60mm~100mm;

[0028] and / or, the spraying angle is 30° to 45°;

[0029] and / or, the air pressure intensity is 0.8 MPa to 1.0 MPa;

[0030] And / or, the powder flow rate is 300 L / h to 500 L / h.

[0031] As a second aspect, a highly active binary alloy hydrogen evolution electrode plate is provided. The highly active binary alloy hydrogen evolution electrode plate is produced according to the aforementioned process for producing a highly active binary alloy hydrogen evolution electrode plate. This significantly improves the catalytic activity and stability of the surface catalyst of the highly active binary alloy hydrogen evolution electrode plate.

[0032] Specifically, the high-activity binary alloy hydrogen evolution electrode plate is used to perform an electrocatalytic hydrogen evolution reaction in an alkaline electrolyte.

[0033] Therefore, excellent hydrogen production effect can be achieved in the electrocatalytic hydrogen evolution process.

[0034] The beneficial effects of the high-activity binary alloy hydrogen evolution electrode plate and the preparation process of the present invention are:

[0035] The invention provides a high-activity binary alloy hydrogen evolution electrode plate and a preparation process method thereof. First, an obtained metal nickel electrode substrate is sandblasted pre-treated with white corundum sand to obtain an intermediate hydrogen evolution electrode plate having no reflective bright spots at all angles. Then, based on atmospheric plasma spraying, spraying conditions are adjusted to spray binary metal alloy powder onto the intermediate hydrogen evolution electrode plate to prepare a high-activity binary alloy hydrogen evolution electrode plate with catalytic effect. The entire preparation process method sequentially performs steps such as cleaning, sandblasting pre-treatment, atmospheric plasma spraying, and natural cooling. The process method for preparing the electrode plate is optimized to ensure that the electrode plate has excellent long-term stability of hydrogen evolution during a hydrogen evolution reaction, and can achieve excellent hydrogen production effect in the electrocatalytic hydrogen evolution process. The combined application of sandblasting pre-treatment and plasma spraying can stably and uniformly spray the alloy powder in a molten state onto the surface of the metal nickel mesh, thereby improving the bonding strength of the interface, reducing the shedding of the catalyst during the hydrogen evolution process, and facilitating the improvement of the long-term stability of the catalyst.

[0036] The hydrogen evolution catalyst spraying process provided in the present application is simple and easy to implement for expanded production. The binary metal alloy catalyst sprayed on the surface of the metal nickel mesh prepared by the preparation process provided in the present application has potential application value in the field of hydrogen production by electrolysis of water, and is expected to become an important breakthrough in hydrogen production technology by electrolysis of water, thereby promoting the development of the clean energy field. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Figure 1 The present invention is a flow chart of a process for preparing a high-activity binary alloy hydrogen evolution electrode plate.

[0039] Figure 2 This is a stability comparison chart of the hydrogen evolution catalysts prepared by the process methods of Examples 1-6 of the present application and Comparative Examples 1-2 at a current density of 200 mA / cm2. DETAILED DESCRIPTION

[0040] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0041] The present invention provides a process for preparing a high-activity binary alloy hydrogen evolution electrode plate. Figure 1 , the above method includes the following contents:

[0042] S100: obtaining a metal nickel electrode substrate and white corundum sand of different particle sizes; and cleaning the initial metal nickel electrode substrate;

[0043] S200: using the pretreated nickel metal substrate as a working electrode, and performing sandblasting pretreatment on the nickel metal electrode substrate using the white corundum sand;

[0044] S300: performing dust removal on the metal nickel electrode substrate after sandblasting pretreatment until an intermediate hydrogen evolution electrode plate with no reflective bright spots at all angles is obtained;

[0045] S400: Using binary metal alloy powder as raw material, spraying the binary metal alloy powder onto the intermediate hydrogen evolution electrode plate through an atmospheric plasma spraying process, and naturally cooling it at room temperature to form a high-activity binary alloy hydrogen evolution electrode plate.

[0046] In step S100, as a preferred embodiment, the present application preferably uses nickel mesh as the working electrode. Nickel mesh has a larger specific surface area, can provide more reaction interfaces, increase the contact area between the reactants and the electrode, is conducive to the occurrence of catalytic reaction, and thus can improve the electrolysis efficiency.

[0047] In the present application, the obtained white corundum sand particle size is 40-200 mesh. More specifically, the white corundum sand particle size can be 40 mesh, 60 mesh, 80 mesh, 100 mesh, 150 mesh, 200 mesh, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0048] According to a specific embodiment of the present invention, in step S100, the cleaning process of the metal nickel initial electrode substrate specifically includes: using pure water to rinse the surface of the obtained metal nickel electrode substrate to ensure that there is no impurities such as dust or oil on the surface of the metal nickel electrode substrate.

[0049] According to another specific embodiment of the present application, in step S200, the sandblasting pretreatment includes the following parameter settings: the injection pressure is 0.6Mpa to 0.8Mpa; and / or the sandblasting angle is 45° to 90°; and / or the electrode movement rate is 16mm / s to 28mm / s; and / or the control cabinet voltage is 36V. Specifically, a sandblasting machine is used to quickly remove the surface oxide layer of the metal nickel electrode substrate and increase the surface roughness. During the pretreatment process, the spray gun is moved evenly to avoid local excessive sandblasting. The parameters of the sandblasting pretreatment in this embodiment can be adaptively adjusted according to specific scenarios and needs, and will not be listed here one by one.

[0050] According to another specific embodiment of the present application, in step S300, the dust removal operation on the metal nickel electrode substrate after sandblasting pretreatment specifically includes: using dry compressed air to blow away sand and dust attached to the surface of the metal nickel electrode substrate after pretreatment, so as to ensure the cleanliness of the metal nickel electrode substrate after pretreatment.

[0051] According to another specific embodiment of the present application, in step S300, the alloy powder includes any one of a nickel-cobalt alloy powder, a nickel-copper alloy powder, a nickel-iron alloy powder, a nickel-tin alloy powder, a nickel-molybdenum alloy powder, a cobalt-iron alloy powder, a cobalt-tin alloy powder, a cobalt-copper alloy powder, and a cobalt-molybdenum alloy powder. The mass ratio of the two metals in the binary metal powder is 1:1-4:1. More specifically, the alloy powder mass ratio can be 1:1, 2:1, 3:1, 4:1, and specific values ​​between the above values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific values ​​included in the above range.

[0052] According to another specific embodiment of the present application, the particle size of the binary alloy powder in the present application is 50-150 mesh. When the atmospheric plasma spraying process is performed, the particle size of the binary alloy powder is within this range, and the spraying uniformity and stability are optimal.

[0053] According to another specific embodiment of the present application, in step S400, the parameters of the atmospheric plasma spraying process used in the present application are set as follows: the spraying distance is 60 mm to 100 mm; and / or the spraying angle is 30° to 45°; and / or the air pressure intensity is 0.8 MPa to 1.0 MPa; and / or the powder flow rate is 300 L / h to 500 L / h.

[0054] The spraying distance can be 60mm, 70mm, 80mm, 90mm, 100mm, and specific point values ​​between the above point values, and the spraying angle is 30-45°. The spraying angle can be 30°, 35°, 40°, 45°, and specific point values ​​between the above point values. The air pressure intensity can be 0.8Mpa, 0.9Mpa, 1.0Mpa, and specific point values ​​between the above point values. The powder flow rate can be 300L / h, 300L / h, 300L / h, and specific point values ​​between the above point values. Make a suitable choice based on the specific use requirements, and no longer list them one by one here.

[0055] It should be understood that, in this embodiment, when spraying the catalyst layer on the intermediate hydrogen evolution electrode plate after sandblasting pretreatment, it needs to be done within two hours after the sandblasting pretreatment to ensure that the sprayed catalyst has better stability.

[0056] In this application, there is no special limitation on the specific reaction device and external furnishings. For example, common solution reaction devices include but are not limited to beakers, flasks or other containers; the heating device can be a heating furnace, common heating furnaces include but are not limited to resistance heating furnaces, microwave heating furnaces, induction heating furnaces, radiation heating furnaces, etc.; the corresponding raw material holding device or container or reaction site is not specifically limited, common raw material placement devices include but are not limited to crucibles, glass, quartz and other materials; the external device for providing reaction atmosphere can be existing self-built or commercial equipment, which is not limited here.

[0057] The present invention also provides a high-activity binary alloy hydrogen evolution electrode plate, which is prepared according to the above-mentioned process for preparing the high-activity binary alloy hydrogen evolution electrode plate. The high-activity binary alloy hydrogen evolution electrode plate is used for performing an electrocatalytic hydrogen evolution reaction in an alkaline electrolyte.

[0058] The following embodiments of the present invention are described in detail. It should be noted that the following embodiments are illustrative and are intended only to explain the present invention and are not to be construed as limiting the present invention. In addition, unless otherwise expressly stated, all reagents used in the following embodiments are commercially available or can be synthesized according to methods described herein or known methods. Reaction conditions not listed are also readily available to those skilled in the art.

[0059] Example 1

[0060] Load nickel-cobalt alloy powder with a mass ratio of 1:1 into the sample barrel of the plasma spray equipment.

[0061] 20*20cm 2 The metal nickel mesh substrate is first rinsed with pure water to remove pollutants and oil stains on the electrode surface. After rinsing, the electrode is sandblasted. The type of gravel is white corundum sand, the model of gravel is 60 mesh, the spray pressure is 0.6Mpa, the electrode moving rate is 16mm / s, the control cabinet voltage is 36V, and the sandblasting angle is 45°.

[0062] After sandblasting, use dry compressed air to blow away the sand and dust attached to the electrode surface. Observe the substrate surface from all angles to see that there are no reflective bright spots.

[0063] To prevent oxidation and contamination of the substrate surface, a plasma spray coating was applied to the surface within 2 hours after spraying. The alloy powder particle size was 50 mesh. When spraying the coating, the spray distance was 60 mm, the spray angle was 30°, hydrogen was used as the combustion gas, the gas supply pressure was 0.8 MPa, the main powder supply gas was argon, the auxiliary powder supply gas was nitrogen, the powder flow rate was 300 L / h, the spray current was 300 A, the spray voltage was 40 V, and the spray rate was 160 mm / sec.

[0064] After spraying, slowly place the sample at room temperature to cool naturally to reduce stress.

[0065] The above-prepared high-activity binary alloy hydrogen evolution electrode plate was used as the working electrode, the nickel mesh was used as the counter electrode, and 6 mol / L KOH was used as the electrolyte to carry out the water electrolysis hydrogen evolution experiment.

[0066] Example 2

[0067] Load nickel-cobalt alloy powder with a mass ratio of 1:1 into the sample barrel of the plasma spray equipment.

[0068] 20*20cm 2 The metal nickel mesh substrate is first rinsed with pure water to remove pollutants and oil stains on the electrode surface. After rinsing, the electrode is sandblasted. The type of grit is white corundum sand, the grit model is 60 mesh, the spray pressure is 0.8Mpa, the electrode moving rate is 24mm / s, the control cabinet voltage is 36V, and the sandblasting angle is 60°.

[0069] After sandblasting, use dry compressed air to blow away the sand and dust attached to the electrode surface. Observe the substrate surface from all angles to see that there are no reflective bright spots.

[0070] To prevent oxidation and contamination of the substrate surface, a plasma spray coating was applied to the surface within 2 hours after spraying. The alloy powder particle size was 50 mesh. When spraying the coating, the spray distance was 80 mm, the spray angle was 30°, hydrogen was used as the combustion gas, the gas supply pressure was 0.8 MPa, the main powder supply gas was argon, the auxiliary powder supply gas was nitrogen, the flow rate was 400 L / h, the spray current was 300 A, the spray voltage was 40 V, and the spray rate was 160 mm / sec.

[0071] After spraying, slowly place the sample at room temperature to cool naturally to reduce stress.

[0072] The above-prepared high-activity binary alloy hydrogen evolution electrode plate was used as the working electrode, the nickel mesh was used as the counter electrode, and 6 mol / L KOH was used as the electrolyte to carry out the water electrolysis hydrogen evolution experiment.

[0073] Example 3

[0074] Load nickel-cobalt alloy powder with a mass ratio of 1:1 into the sample barrel of the plasma spray equipment.

[0075] 20*20cm 2The metal nickel mesh substrate is first rinsed with pure water to remove pollutants and oil stains on the electrode surface. After rinsing, the electrode is sandblasted. The type of grit is white corundum sand, the grit model is 60 mesh, the spray pressure is 0.6Mpa, the electrode moving rate is 20mm / s, the control cabinet voltage is 36V, and the sandblasting angle is 90°.

[0076] After sandblasting, use dry compressed air to blow away the sand and dust attached to the electrode surface. Observe the substrate surface from all angles to see that there are no reflective bright spots.

[0077] To prevent oxidation and contamination of the substrate surface, a plasma spray coating was applied to the surface within 2 hours after spraying. The alloy powder particle size was 50 mesh. When spraying the coating, the spray distance was 80 mm, the spray angle was 40°, hydrogen was used as the combustion gas, the gas supply pressure was 0.8 MPa, the main powder supply gas was argon, the auxiliary powder supply gas was nitrogen, the flow rate was 500 L / h, the spray current was 300 A, the spray voltage was 40 V, and the spray rate was 160 mm / sec.

[0078] After spraying, slowly place the sample at room temperature to cool naturally to reduce stress.

[0079] The above-prepared high-activity binary alloy hydrogen evolution electrode plate was used as the working electrode, the nickel mesh was used as the counter electrode, and 6 mol / L KOH was used as the electrolyte to carry out the water electrolysis hydrogen evolution experiment.

[0080] Example 4

[0081] Load nickel-cobalt alloy powder with a mass ratio of 1:1 into the sample barrel of the plasma spray equipment;

[0082] 20*20cm 2 The metal nickel mesh substrate is first rinsed with pure water to remove pollutants and oil stains on the electrode surface. After rinsing, the electrode is sandblasted. The type of gravel is white corundum sand, the model of gravel is 60 mesh, the spray pressure is 0.6Mpa, the electrode moving rate is 16mm / s, the control cabinet voltage is 36V, and the sandblasting angle is 45°.

[0083] After sandblasting, use dry compressed air to blow away the sand and dust attached to the electrode surface. Observe the substrate surface from all angles to see that there are no reflective bright spots.

[0084] To prevent oxidation and contamination of the substrate surface, a plasma spray coating was applied to the surface within 2 hours after spraying. The alloy powder particle size was 50 mesh. When spraying the coating, the spray distance was 80 mm, the spray angle was 40°, hydrogen was used as the combustion gas, the gas supply pressure was 1.0 MPa, the main powder supply gas was argon, the auxiliary powder supply gas was nitrogen, the flow rate was 400 L / h, the spray current was 300 A, the spray voltage was 40 V, and the spray rate was 160 mm / sec.

[0085] After spraying, slowly place the sample at room temperature to cool naturally to reduce stress.

[0086] The above-prepared nickel metal-loaded amorphous copper hydroxide / nickel-iron oxide heterojunction electrode was used as the working electrode, the nickel mesh was used as the counter electrode, and 6 mol / L KOH was used as the electrolyte to carry out the water electrolysis hydrogen evolution experiment.

[0087] Example 5

[0088] Nickel-cobalt alloy powder with a mass ratio of 2:1 was loaded into the sample barrel of the plasma spray equipment.

[0089] 20*20cm 2 The metal nickel mesh substrate is first rinsed with pure water to remove pollutants and oil stains on the electrode surface. After rinsing, the electrode is sandblasted. The type of grit is white corundum sand, the grit model is 80 mesh, the spray pressure is 0.6Mpa, the electrode moving rate is 16mm / s, the control cabinet voltage is 36V, and the sandblasting angle is 45°.

[0090] After sandblasting, use dry compressed air to blow away the sand and dust attached to the electrode surface. Observe the substrate surface from all angles to see that there are no reflective bright spots.

[0091] To prevent oxidation and contamination of the substrate surface, a plasma spray coating was applied to the surface within 2 hours after spraying. The alloy powder particle size was 50 mesh. When spraying the coating, the spray distance was 80 mm, the spray angle was 40°, hydrogen was used as the combustion gas, the gas supply pressure was 1.0 MPa, the main powder supply gas was argon, the auxiliary powder supply gas was nitrogen, the flow rate was 500 L / h, the spray current was 300 A, the spray voltage was 40 V, and the spray rate was 160 mm / sec.

[0092] After spraying, the sample was slowly placed at room temperature to cool naturally to reduce stress. The highly active binary alloy hydrogen evolution electrode plate prepared above was used as the working electrode, the nickel mesh was used as the counter electrode, and 6 mol / L KOH was used as the electrolyte to carry out the water electrolysis hydrogen evolution experiment.

[0093] Example 6

[0094] Nickel-cobalt alloy powder with a mass ratio of 4:1 was loaded into the sample barrel of the plasma spray equipment.

[0095] 20*20cm 2 The metal nickel mesh substrate is first rinsed with pure water to remove pollutants and oil stains on the electrode surface. After rinsing, the electrode is sandblasted. The type of gravel is white corundum sand, the model of gravel is 80 mesh, the spray pressure is 0.7Mpa, the electrode moving rate is 16mm / s, the control cabinet voltage is 36V, and the sandblasting angle is 50°.

[0096] After sandblasting, use dry compressed air to blow away the sand and dust attached to the electrode surface. Observe the substrate surface from all angles to see that there are no reflective bright spots.

[0097] To prevent oxidation and contamination of the substrate surface, a plasma spray coating was applied to the surface within 2 hours after spraying. The alloy powder particle size was 50 mesh. When spraying the coating, the spray distance was 100 mm, the spray angle was 40°, hydrogen was used as the combustion gas, the gas supply pressure was 0.8 MPa, the main powder supply gas was argon, the auxiliary powder supply gas was nitrogen, the flow rate was 500 L / h, the spray current was 300 A, the spray voltage was 40 V, and the spray rate was 160 mm / sec.

[0098] After spraying, the sample was slowly placed at room temperature to cool naturally to reduce stress. The highly active binary alloy hydrogen evolution electrode plate prepared above was used as the working electrode, the nickel mesh was used as the counter electrode, and 6 mol / L KOH was used as the electrolyte to carry out the water electrolysis hydrogen evolution experiment.

[0099] It should be understood that the grit size of the white corundum sand in this embodiment can also be 110 mesh, 120 mesh or 160 mesh, etc., which have different effects on deoxidation and roughness increase of the metal nickel mesh substrate surface. The experimental data will not be listed here one by one.

[0100] from Figure 2 It can be clearly seen that the hydrogen evolution electrode plate prepared by the present application has excellent hydrogen evolution catalytic activity and long-term stability, and the decomposition voltage is significantly lower than the decomposition voltage of Comparative Example 1 and Comparative Example 2. The high-activity binary alloy hydrogen evolution electrode plate prepared by the preparation method of the present application not only has high catalytic activity and high stability but also can reduce the decomposition voltage and reduce energy consumption.

[0101] It should be understood that the specific embodiments described above are only used to explain the present invention and are not intended to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A process for preparing a high-activity binary alloy hydrogen evolution electrode plate, characterized in that: Includes the following: (1) obtaining a metal nickel electrode substrate and white corundum sand of different particle sizes; and cleaning the metal nickel initial electrode substrate; (2) using the pretreated nickel metal substrate as a working electrode, and performing sandblasting pretreatment on the nickel metal electrode substrate using the white corundum sand; (3) performing dust removal on the metal nickel electrode substrate after sandblasting pretreatment until an intermediate hydrogen evolution electrode plate with no reflective bright spots at all angles is obtained; (4) Using binary metal alloy powder as raw material, the binary metal alloy powder is sprayed onto the intermediate hydrogen evolution electrode plate through an atmospheric plasma spraying process, and is naturally cooled at room temperature to form a high-activity binary alloy hydrogen evolution electrode plate.

2. The process for preparing a high-activity binary alloy hydrogen evolution electrode plate according to claim 1, characterized in that: In step (1), the cleaning treatment of the metal nickel initial electrode substrate specifically includes: The surface of the obtained metal nickel electrode substrate is rinsed with pure water.

3. The process for preparing a high-activity binary alloy hydrogen evolution electrode plate according to claim 1, characterized in that: In step (3), the dust removal operation on the metal nickel electrode substrate after sandblasting pretreatment specifically includes: Dry compressed air is used to blow away the sand and dust attached to the surface of the pretreated metal nickel electrode substrate.

4. The process for preparing a high-activity binary alloy hydrogen evolution electrode plate according to claim 1, characterized in that: The binary alloy powder includes any one of nickel-cobalt alloy powder, nickel-copper alloy powder, nickel-iron alloy powder, nickel-tin alloy powder, nickel-molybdenum alloy powder, cobalt-iron alloy powder, cobalt-tin alloy powder, cobalt-copper alloy powder, and cobalt-molybdenum alloy powder; Or / and, the mass ratio of the two metals in the binary metal powder is 1:1-4:

1.

5. The process for preparing a high-activity binary alloy hydrogen evolution electrode plate according to claim 1, characterized in that: The particle size of the white corundum sand is 40 to 200 meshes.

6. The process for preparing a high-activity binary alloy hydrogen evolution electrode plate according to claim 1, characterized in that: The particle size of the binary alloy powder is 50-150 meshes.

7. The process for preparing a high-activity binary alloy hydrogen evolution electrode plate according to claim 1, characterized in that: In step (2), the sandblasting pretreatment includes the following parameter settings: The injection pressure is 0.6Mpa~0.8Mpa; and / or, the blasting angle is 45° to 90°; and / or, the electrode movement rate is 16 mm / s to 28 mm / s; And / or, the control cabinet voltage is 36V.

8. The process for preparing a high-activity binary alloy hydrogen evolution electrode plate according to claim 1, characterized in that: In step (4), the parameters of the atmospheric plasma spraying process are set as follows: Spraying distance is 60mm~100mm; and / or, the spraying angle is 30° to 45°; and / or, the air pressure intensity is 0.8 MPa to 1.0 MPa; And / or, the powder flow rate is 300 L / h to 500 L / h.

9. A high-activity binary alloy hydrogen evolution electrode plate, characterized in that: The high-activity binary alloy hydrogen evolution electrode plate is prepared according to the process for preparing the high-activity binary alloy hydrogen evolution electrode plate according to any one of claims 1 to 7.

10. The high-activity binary alloy hydrogen evolution electrode plate according to claim 8, characterized in that: The high-activity binary alloy hydrogen evolution electrode plate is used for performing an electrocatalytic hydrogen evolution reaction in an alkaline electrolyte.

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