Cobalt-doped nickel-molybdenum-aluminum alloy electrode and preparation method thereof

Abstract

The invention relates to the technical field of electrode material preparation, and discloses a cobalt-doped nickel-molybdenum-aluminum alloy electrode and a preparation method thereof.The preparation method comprises the following steps that metal powder is mixed and then subjected to ball-milling mixing, and metal mixed powder is obtained; fully mixing the metal mixed powder with ethanolamine to obtain a mixed material, coating a nickel net with the mixed material, and then carrying out vacuum drying; carrying out laser treatment on the nickel net subjected to vacuum drying; and carrying out dealloying treatment on the nickel net subjected to laser treatment to obtain the cobalt-doped nickel-molybdenum-aluminum alloy electrode. The cobalt-doped nickel-molybdenum-aluminum alloy electrode is an alkaline water electrolysis catalyst electrode, can efficiently catalyze the hydrogen precipitation reaction of a cathode, and has excellent working condition stability.

Description

Technical Field

[0001] The present application relates to the technical field of electrode material preparation, and mainly to a cobalt-doped nickel-molybdenum-aluminum alloy electrode and a preparation method thereof. Background Art

[0002] With the continuous growth of population and rapid social development, energy consumption is increasing exponentially, and it is crucial to shift the energy supply from traditional fossil fuels to other renewable and environmentally friendly energy sources. Hydrogen is generally considered to be one of the zero-carbon energy candidates to replace fossil fuels due to its advantages of being renewable, pollution-free and energy-efficient. At present, the production of hydrogen is mainly carried out through steam reforming of natural gas (such as methane) or other fossil fuels. However, a large amount of greenhouse gases are inevitably produced in this process. As a means of hydrogen production, water electrolysis has attracted great interest because it uses electricity from renewable energy to produce high-purity hydrogen in an environmentally friendly way.

[0003] Water electrolysis can be carried out in acidic or alkaline electrolytes. Under acidic conditions, proton exchange membrane electrolyzers (PEMWE) show various advantages, such as high efficiency and hydrogen purity and low ohmic loss. However, the use of precious metal catalysts makes PEMWE costly, limiting its commercial application. In contrast, traditional alkaline water electrolyzers (AWE) can use transition metal-based catalysts that are abundant on the earth, such as nickel, cobalt, iron, copper, etc., which can greatly reduce the cost of electrodes and are also the most mature technology for hydrogen production by electrolysis of water. At present, most of the catalysts used in AWE electrodes in industry are nickel-based catalysts. Although most nickel-based catalysts have good catalytic activity, under high current density and high temperature and concentrated alkali working conditions, most electrodes using these nickel-based catalysts will have the problem of reduced hydrogen evolution performance due to the detachment of the catalyst layer or the dissolution of metal elements. Therefore, improving the bonding strength between the catalyst layer and the electrode substrate, inhibiting the dissolution of the catalyst in the electrochemical process, and exposing the active sites of the catalyst as much as possible are the directions for achieving efficient and stable hydrogen production under working conditions of alkaline water electrolysis.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a cobalt-doped nickel-molybdenum-aluminum alloy electrode and a preparation method thereof. The cobalt-doped nickel-molybdenum-aluminum alloy electrode of the present application is used for alkaline water electrolysis to produce hydrogen, and can produce hydrogen efficiently and stably under working conditions, aiming to solve the problem of insufficient stability of existing electrodes used for alkaline water electrolysis to produce hydrogen under working conditions.

[0006] The technical solution of this application is as follows: A method for preparing a cobalt-doped nickel-molybdenum-aluminum alloy electrode, comprising the following steps: S1, mixing metal powders, and then ball milling to obtain metal mixed powder; S2, fully mixing the metal mixed powder and ethanolamine to obtain a mixed material, coating the mixed material on a nickel mesh, and then vacuum drying; S3, performing laser treatment on the nickel mesh after the vacuum drying; S4, performing dealloying treatment on the nickel mesh after the laser treatment to obtain a cobalt-doped nickel-molybdenum-aluminum alloy electrode; The metal powder includes nickel powder, cobalt powder, molybdenum powder and aluminum powder.

[0007] In the preparation method of the cobalt-doped nickel-molybdenum-aluminum alloy electrode of the present application, through the process combination of laser treatment + dealloying treatment, combined with a specific alloy component ratio, the prepared cobalt-doped nickel-molybdenum-aluminum alloy electrode is an alkaline water electrolysis catalyst electrode, which can efficiently catalyze the hydrogen evolution reaction (HER) at the cathode and has excellent operating stability.

[0008] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, wherein the mass ratio of the nickel powder, the cobalt powder, the molybdenum powder and the aluminum powder is 60:5:15:20. The prepared cobalt-doped nickel-molybdenum-aluminum alloy electrode is Ni 60 Co 5 Mo 15 Al 20 Alloy electrode, Ni 60 Co 5 Mo 15 Al 20 The alloy is a catalyst.

[0009] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, wherein, during the laser treatment process in step S3, the power of the laser beam is 50-150w, and the scanning speed is 10-100mm / s. In the present application, through specific laser treatment, the metal powder on the surface of the nickel mesh is uniformly formed into an alloy phase and strongly combined with the nickel mesh, thereby reducing the shedding and dissolution of the catalyst.

[0010] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, wherein in step S4, the dealloying process is a dealloying treatment at 50-100° C. for 12-48 hours in an aqueous solution containing 10-40wt% KOH and 5-20wt% potassium sodium tartrate.

[0011] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, wherein stearic acid is added during the ball milling mixing process in step S1, and the amount of stearic acid added is 1-5wt% of the metal powder; The ball milling mixing time in step S1 is 5-24 hours, the rotation speed of the ball mill is 200-500 r / min, and the ball-to-powder weight ratio is 5-20:1.

[0012] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, wherein in step S2, the amount of ethanolamine used is 2-8wt% of the metal mixed powder.

[0013] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, wherein in step S2, the coating amount of the mixed material on the nickel mesh is 0.5-3 mg / cm 2 ; In step S2, the temperature of the vacuum drying is controlled at 50°C, and the processing time of the vacuum drying is 0.5 to 3 hours.

[0014] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, before step S1, further comprises the following steps: Treating the nickel mesh with a flattening machine; Ultrasonic treatment of the nickel mesh in an organic solvent to remove grease and impurities on the surface of the nickel mesh; The cleaned nickel mesh is treated with a hydrochloric acid solution to remove the oxide layer on the surface of the nickel mesh.

[0015] The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode, wherein the ball milling mixing time in step S1 is 12 hours, the speed of the ball mill is 300 r / min, and the ball powder weight ratio is 10:1; In step S2, the amount of ethanolamine used is 5wt% of the metal mixed powder; In step S2, the coating amount of the mixed material on the nickel mesh is 2 mg / cm 2 ; In the laser processing process of step S3, the power of the laser beam is 70w and the scanning speed is 50mm / s; In step S4, the dealloying treatment is carried out in an aqueous solution containing 30 wt % KOH and 10 wt % potassium sodium tartrate at 90° C. for 24 hours.

[0016] A cobalt-doped nickel-molybdenum-aluminum alloy electrode is prepared by the method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode as described above.

[0017] Beneficial effect: The cobalt-doped nickel-molybdenum-aluminum alloy electrode prepared by the preparation method of the cobalt-doped nickel-molybdenum-aluminum alloy electrode of the present application is an alkaline water electrolysis catalyst electrode, which can efficiently catalyze the hydrogen evolution reaction (HER) at the cathode and has excellent operating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1a-1b The Ni prepared in Example 3 of this application 65 Mo 15 Al 20 SEM analysis of alloy electrodes at different magnifications.

[0019] Figure 1c-1d The Ni prepared in Example 2 of this application 60 Co 5 Mo 15 Al 20 SEM analysis of alloy electrodes at different magnifications.

[0020] Figure 2 For the commercial Pt electrode and Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 Hydrogen evolution test curve of alloy electrode in 30wt% KOH electrolyte at room temperature.

[0021] Figure 3 For the commercial Pt electrode and Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 Complete water splitting test curve of alloy electrode in 30wt% KOH electrolyte at 90℃.

[0022] Figure 4 In the embodiment of this application, Ni 65 Mo 15 Al 20 ||Pt and Ni 60 Co 5 Mo 15 Al 20 ||Pt complete water splitting test curve in 30wt% KOH electrolyte at 90℃.

[0023] Figure 5 Raney nickel||Pt and Ni in the embodiment of this application 60 Co 5 Mo 15 Al 20 ||Pt complete water splitting test curve in 30wt% KOH electrolyte at 90℃. DETAILED DESCRIPTION

[0024] The present application provides a cobalt-doped nickel-molybdenum-aluminum alloy electrode and a preparation method thereof. To make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] The present application provides a method for preparing a cobalt-doped nickel-molybdenum-aluminum alloy electrode, comprising the following steps: S1, mixing metal powders, and then ball milling to obtain metal mixed powder; S2, fully mixing the metal mixed powder and ethanolamine to obtain a mixed material, coating the mixed material on a nickel mesh, and then vacuum drying; S3, laser processing the vacuum-dried nickel mesh; S4. Dealloying the laser-treated nickel mesh to obtain a cobalt-doped nickel-molybdenum-aluminum alloy electrode.

[0026] Preferably, before step S1, the following steps may also be included: S0. Pre-treat the nickel mesh.

[0027] The preprocessing process of step S0 may include the following steps: Process the nickel mesh through a flattening machine; The nickel mesh is ultrasonically treated in an organic solvent to clean the surface of the nickel mesh; The cleaned nickel mesh is treated with a hydrochloric acid solution to remove the oxide layer on the surface of the nickel mesh.

[0028] Specifically, the process of ultrasonically treating the nickel mesh in an organic solvent can be to immerse the nickel mesh in acetone and isopropanol in sequence, and ultrasonicate each for 15 minutes at 40 KHz to remove grease and impurities on the surface of the nickel mesh.

[0029] Specifically, the cleaned nickel mesh is treated with a hydrochloric acid solution by soaking it in a 5-10wt% hydrochloric acid aqueous solution for 0.5h to remove the oxide layer on the surface of the substrate. After being treated with the hydrochloric acid solution, the nickel mesh can be washed with deionized water and dried for standby use.

[0030] In step S1, the metal powder includes nickel powder, cobalt powder, molybdenum powder and aluminum powder; wherein the mass ratio of nickel powder, cobalt powder, molybdenum powder and aluminum powder is 60:5:15:20, and the prepared cobalt-doped nickel-molybdenum-aluminum alloy electrode is Ni 60 Co 5 Mo 15 Al 20 Alloy electrode, Ni 60 Co 5 Mo 15 Al 20 The alloy is a catalyst.

[0031] In step S1, stearic acid (CH 3 (CH 2 ) 16 CO 2 H) process control agent, wherein the amount of stearic acid added is 1-5wt% of the metal powder.

[0032] In step S1, the ball milling mixing time can be 5-24 hours, the rotation speed of the ball mill can be 200-500 r / min, and the ball-to-powder weight ratio can be 5-20:1.

[0033] Preferably, the ball milling mixing time can be 12 hours, the ball mill speed can be 300 r / min, and the ball-to-powder weight ratio can be 10: 1. The use of this preferred grinding parameter can make the metal powder be mixed evenly, and form a uniform alloy phase in the later laser treatment, thereby improving its catalytic performance and stability.

[0034] In step S2, the amount of ethanolamine used is 2-8wt% of the metal mixed powder, preferably 5wt%. Ethanolamine has a certain alkalinity and is corrosive to metals. Using a specific ratio can reduce its corrosion to the metal mixed powder and exert its antioxidant function. In addition, ethanolamine mixed with the metal mixed powder can form a protective film on the metal surface to prevent the metal from being oxidized.

[0035] In step S2, the coating amount of the mixed material on the nickel mesh is 0.5-3 mg / cm 2 , preferably 2 mg / cm 2 .

[0036] In step S2, the temperature of vacuum drying can be controlled at 50°C, and the processing time of vacuum drying can be 0.5 to 3 hours.

[0037] During the laser treatment process of step S3, the power of the laser beam can be 50~150w, and the scanning speed can be 10~100mm / s. Preferably, the power of the laser beam is preferably 70w, and the scanning speed is preferably 50mm / s. The preferred laser beam power can make the metal powder form an alloy phase and strongly combine with the nickel mesh substrate, and the appropriate scanning speed can make the alloy phase uniform. In the present application scheme, by laser treatment, the metal powder on the surface of the nickel mesh is uniformly formed into an alloy phase and strongly combined with the nickel mesh, thereby reducing the shedding and dissolution of the catalyst. In addition, since the catalyst is directly loaded on the nickel mesh substrate by coating, the active sites of the catalyst can be directly exposed, thereby realizing efficient and stable hydrogen production in alkaline water electrolysis under working conditions. In addition, laser treatment can also remove the stearic acid used during ball milling.

[0038] In step S4, the dealloying treatment process is specifically a dealloying treatment at 50-100° C. for 12-48 hours in an aqueous solution containing 10-40wt% KOH and 5-20wt% potassium sodium tartrate. Preferably, the dealloying treatment process is specifically a dealloying treatment at 90° C. for 24 hours in an aqueous solution containing 30wt% KOH and 10wt% potassium sodium tartrate.

[0039] During the dealloying treatment, the treatment is carried out at 90°C, which is close to the actual temperature of industrial electrolyzed water. It can increase the dealloying rate of the Al phase and also help improve the thermal stability of the alloy. In the present application scheme, the laser treatment is first performed and then the dealloying treatment is performed because there will be Al in the alloy phase obtained by the laser treatment. The dealloying treatment can remove the Al in the alloy phase and reduce the dissolution of the catalyst in the electrochemical process. If the dealloying treatment is not performed, the alkaline electrolyte will dissolve the Al in the alloy phase under actual working conditions, which will affect the alkaline electrolyte and may also affect the performance of the electrode.

[0040] Furthermore, after step S4, the following steps may also be included: S5. The decobalt-doped nickel-molybdenum-aluminum alloy electrode is repeatedly washed with deionized water and ethanol in turn to remove residual chemicals.

[0041] Furthermore, the present application also provides a cobalt-doped nickel-molybdenum-aluminum alloy electrode, which is prepared by the above-mentioned preparation method of the cobalt-doped nickel-molybdenum-aluminum alloy electrode. The cobalt-doped nickel-molybdenum-aluminum alloy electrode of the present application is an alkaline water electrolysis catalyst electrode, which can efficiently catalyze the hydrogen evolution reaction (HER) at the cathode.

[0042] On the other hand, the present application significantly improves the stability of the catalyst electrode by doping cobalt in the catalyst, providing a strategy for improving the working stability of the electrocatalyst. Moreover, compared with the existing research, the advantage of the present application is that the preparation process of the catalyst electrode is easy to realize industrial production, and the prepared electrode has excellent working stability.

[0043] The present application is further described below through specific examples.

[0044] Example 1: Nickel mesh substrate pretreatment After the nickel mesh was treated with a flattening machine, it was immersed in acetone and isopropanol in turn, and ultrasonicated at 40KHz for 15min each to remove grease and impurities on the surface of the nickel mesh, and then transferred to a 10wt% hydrochloric acid aqueous solution for 0.5h to remove the oxide layer on the surface of the nickel mesh, and finally washed with deionized water and dried for standby use; Example 2: Preparation of Co-doped Nickel-Molybdenum-Aluminum Alloy (Co-NiMoAl) Electrode 60g nickel powder (Ni), 5g cobalt powder (Co), 15g molybdenum powder (Mo) and 20g aluminum powder (Al) were physically mixed, and then 2wt% stearic acid (CH 3 (CH 2 ) 16 CO 2 H), placed in a ball mill for 12 hours, the ball mill speed is 300 r / min, the ball powder weight ratio is 10:1; the metal mixed powder after ball milling is fully mixed with 5wt% of ethanolamine and then evenly coated on the nickel mesh pre-treated in Example 1, and the coating amount is 2mg / cm 2 , and then placed it in a vacuum drying oven at 50°C for 1h; the dried coated nickel mesh was subjected to laser beam scanning treatment, the laser beam power was 70w, the scanning speed was 50mm / s, and Ni 60 Co 5 Mo 15 Al 20 Alloy electrode; Ni 60 Co 5 Mo 15 Al 20 The alloy electrode was dealloyed in an aqueous solution containing 30 wt% KOH and 10 wt% potassium sodium tartrate at 90 °C for 24 h to obtain an activated Ni 60 Co 5 Mo 15 Al 20 Alloy electrode.

[0045] Example 3: Preparation of nickel-molybdenum-aluminum alloy (NiMoAl) electrode The preparation method of the nickel-molybdenum-aluminum alloy (NiMoAl) electrode of Example 3 is basically the same as that of Example 2, except that the composition of the metal powder is different. In Example 3, 65g of nickel powder, 15g of molybdenum powder and 20g of aluminum powder are physically mixed to finally obtain NiMoAl. 65 Mo 15 Al 20 Alloy electrode.

[0046] Through energy spectrometer analysis, Ni before activation 65 Mo 15 Al 20 The ratio of each element in the alloy electrode is Ni: Mo: Al = 60: 15: 25; Ni before activation 60 Co 5 Mo 15 Al 20 The ratio of each element in the alloy electrode is Ni:Co:Mo:Al = 52:5:13:30, which is basically consistent with the feed ratio.

[0047] like Figure 1a-1d As shown, Figure 1a-1b For you 65 Mo 15 Al 20 SEM analysis of alloy electrode. Figure 1c-1d For you 60 Co 5 Mo 15 Al 20 SEM analysis of alloy electrodes. Figure 1a-1d You can see, 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 The thickness of the sprayed layer of the alloy electrode is approximately 180 and 210 μm, respectively. The surface morphologies of the two are similar, and the catalyst layer is tightly connected to the substrate.

[0048] Commercial Pt electrode, Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 The electrocatalytic HER performance of the alloy electrode was tested in 30wt% KOH electrolyte at room temperature. 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 The alloy electrode was used as the working electrode, the Pt sheet was used as the counter electrode, and the Hg / HgO was used as the reference electrode. The test method was linear sweep voltammetry with a scan range of -0.9 to -1.75 V and a scan rate of 10 mV / s. The results are shown in Figure 2 As shown, Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 The performance of the alloy electrodes is similar, at 500mA / cm 2 The overpotential at both sites is 456 mV, which is very close to the performance of the Pt electrode, showing excellent electrocatalytic activity.

[0049] Commercial Pt electrode, Ni 65 Mo 15 Al 20Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 The total water splitting voltage of the alloy electrode in 30wt% KOH electrolyte at 90℃ was tested. The counter electrode was a 1*1cm Pt sheet, which was also used as the reference electrode. The working electrodes were Pt electrode, Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 Alloy electrode, the test method is linear sweep voltammetry, the scan range is -1.2~-2.3V, the scan rate is 10mV / s. The results are as follows Figure 3 As shown, using Ni 65 Mo 15 Al 20 and Ni 60 Co 5 Mo 15 Al 20 When the alloy electrode is used as the cathode electrode for hydrogen evolution, the complete water splitting voltage of both is slightly lower than the complete water splitting voltage when Pt is used as the cathode electrode.

[0050] Commercial Pt electrode, Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 The working stability of the alloy electrode in 30wt% KOH electrolyte at 90℃ was tested using Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20 The alloy electrode was used as the working electrode, the Pt sheet was used as the counter electrode and the reference electrode, and the test method was chronopotentiometry at -500 mA / cm 2 The electrolysis was carried out for 200 hours at a current density of Figure 4 As shown, Ni 65 Mo 15 Al 20 Alloy electrode and Ni 60 Co 5 Mo 15 Al 20The initial voltages of the alloy electrodes were -1.817 V and -1.876 V, respectively; the voltages after 200 h were -2.116 V and -2.016 V, respectively; the performance attenuation rates were 16.5% and 7.5%, respectively. It can be seen that doping with 5 wt% cobalt can greatly improve the working stability of the electrode.

[0051] The Raney nickel electrode was obtained by depositing NiCoMo on the nickel mesh by electrodeposition. 60 Co 5 Mo 15 Al 20 The alloy electrode was used as the working electrode, and the Pt sheet was used as the counter electrode and reference electrode. The chronopotentiometry was used to perform water splitting in a 30wt% KOH electrolyte at 90°C for 200h to compare the stability of the two. Figure 5 As shown, compared with the Raney nickel electrode with good stability prepared by conventional electrodeposition, the Ni 60 Co 5 Mo 15 Al 20 The alloy electrode not only has higher catalytic activity, but also has better stability under working conditions.

[0052] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the scope of protection of the present application.

Claims

1. A method for preparing a cobalt-doped nickel-molybdenum-aluminum alloy electrode, It is characterized in that The following steps are involved: S1, mixing metal powders, and then ball milling to obtain metal mixed powder; S2, fully mixing the metal mixed powder and ethanolamine to obtain a mixed material, coating the mixed material on a nickel mesh, and then vacuum drying; S3, performing laser treatment on the nickel mesh after the vacuum drying; S4, performing dealloying treatment on the nickel mesh after the laser treatment to obtain a cobalt-doped nickel-molybdenum-aluminum alloy electrode; The metal powder includes nickel powder, cobalt powder, molybdenum powder and aluminum powder.

2. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that The mass ratio of the nickel powder, the cobalt powder, the molybdenum powder and the aluminum powder is 60:5:15:

20.

3. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that In the laser processing process of step S3, the power of the laser beam is 50-150w, and the scanning speed is 10-100mm / s.

4. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that In step S4, the dealloying process is to carry out dealloying in an aqueous solution containing 10-40 wt% KOH and 5-20 wt% potassium sodium tartrate at 50-100° C. for 12-48 hours.

5. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that Stearic acid is added during the ball milling process of step S1, and the amount of stearic acid added is 1-5wt% of the metal powder; The ball milling mixing time in step S1 is 5-24 hours, the rotation speed of the ball mill is 200-500 r / min, and the ball-to-powder weight ratio is 5-20:

1.

6. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that In step S2, the amount of ethanolamine used is 2-8 wt % of the metal mixed powder.

7. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that In step S2, the coating amount of the mixed material on the nickel mesh is 0.5-3 mg / cm 2 ; In step S2, the temperature of the vacuum drying is controlled at 50°C, and the processing time of the vacuum drying is 0.5 to 3 hours.

8. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that Before step S1, the method further includes the following steps: Treating the nickel mesh with a flattening machine; Ultrasonic treatment of the nickel mesh in an organic solvent to remove grease and impurities on the surface of the nickel mesh; The cleaned nickel mesh is treated with a hydrochloric acid solution to remove the oxide layer on the surface of the nickel mesh.

9. The method for preparing the cobalt-doped nickel-molybdenum-aluminum alloy electrode according to claim 1, It is characterized in that The ball milling mixing time in step S1 is 12 hours, the speed of the ball mill is 300 r / min, and the ball-to-powder weight ratio is 10:1; In step S2, the amount of ethanolamine used is 5wt% of the metal mixed powder; In step S2, the coating amount of the mixed material on the nickel mesh is 2 mg / cm 2 ; In the laser processing process of step S3, the power of the laser beam is 70w and the scanning speed is 50mm / s; In step S4, the dealloying treatment is carried out in an aqueous solution containing 30 wt % KOH and 10 wt % potassium sodium tartrate at 90° C. for 24 hours.

10. A cobalt-doped nickel-molybdenum-aluminum alloy electrode, It is characterized in that The cobalt-doped nickel-molybdenum-aluminum alloy electrode is prepared by the preparation method of any one of claims 1 to 9.

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