Composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis and preparation method thereof

Abstract

The present invention relates to a composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis and a preparation method thereof, belonging to the technical field of hydrogen production by alkaline water electrolysis. The composite electrocatalyst is a composite obtained by introducing Zn 0.7 into the Ni3ZnC 0.08 matrix and Ni 0.92 as the second phase, and the chemical formula is briefly denoted as Zn 0.08 Ni 0.92 / Ni3ZnC 0.7 . By introducing Zn 0.7 and Ni 0.08 into Ni3ZnC 0.92 , the present invention can realize the redistribution of valence electrons, improve the conductivity of the composite electrocatalyst and reduce |ΔG H* |, thereby improving the electron transfer and accelerating the hydrogen atom desorption, and increasing the hydrogen evolution reaction rate; moreover, the preparation process of the composite electrocatalyst is simple and easy to operate, the raw materials are easy to obtain, the cost is low, and it is easy to realize large-scale preparation, and it has good application prospects in hydrogen production by alkaline water electrolysis.

Description

Technical Field

[0001] The invention relates to a composite electrocatalyst of a nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis and a preparation method thereof, belonging to the technical field of producing hydrogen by alkaline water electrolysis. Background Art

[0002] The electrolysis of water to produce hydrogen technology has mild reaction conditions, green and environmentally friendly production process, and sustainable development, and has attracted widespread attention. The electrocatalytic hydrogen evolution reaction (HER) is the key to the electrolysis of water to produce hydrogen, but efficient hydrogen production requires durable and high-performance active catalysts to overcome kinetic barriers and promote reaction kinetics.

[0003] It is currently recognized that precious metal electrocatalysts, such as platinum (Pt), palladium (Pd), gold (Au), etc., have high catalytic activity, but the reserves of such catalysts are limited and the cost is high, which limits their industrial application in hydrogen production by electrolysis of water. Transition metal carbides (TMCs) are "interstitial alloys" formed by carbon atoms entering the transition metal lattice. Carbon atoms can increase the distance between transition metal atoms and expand the lattice, resulting in the contraction of the d-band of the transition metal and the increase of the Fermi level state density, making its surface properties and adsorption performance similar to those of precious metals (Pt). Studies have shown that transition metal carbides Ni 3 ZnC 0.7 It has excellent electrocatalytic hydrogen evolution activity, but due to the relatively negative hydrogen binding energy (ΔG H* ) limits the desorption of atomic hydrogen. During the hydrogen evolution reaction, such catalysts still require a large overpotential, resulting in poor hydrogen evolution performance when used as electrocatalysts in alkaline water electrolysis to produce hydrogen. Summary of the invention

[0004] For Ni 3 ZnC 0.7 The present invention provides a composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis and a preparation method thereof, wherein the composite electrocatalyst is provided by a nickel-zinc alloy and a nickel-zinc carbide for hydrogen production by alkaline water electrolysis. 3 ZnC 0.7 Zn 0.08 Ni 0.92 The interaction between the two can realize the redistribution of valence electrons, improve the conductivity of the material and reduce |ΔG H* |, thereby improving the transfer of electrons and accelerating the desorption of hydrogen atoms, and increasing the rate of hydrogen evolution reaction; the composite electrocatalyst is prepared by a one-step sintering method, the process is simple and easy to operate, the raw materials are easy to obtain, the cost is low, and it is easy to achieve large-scale preparation, and it has good application prospects in the production of hydrogen by alkaline water electrolysis.

[0005] The objectives of the present invention are achieved through the following technical solutions.

[0006] A composite electrocatalyst of a nickel-zinc alloy and a nickel-zinc carbide for hydrogen production by alkaline electrolysis of water, wherein the composite electrocatalyst is Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 .

[0007] Preferably, the preparation of Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 The molar ratio of Ni element to Zn element in the raw material used is 1:4.2~3:1, more preferably 1:2~2:1.

[0008] A method for preparing a composite electrocatalyst of a nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis comprises the following steps:

[0009] NiCl 2 6H 2 O (nickel chloride hexahydrate), Zn(CH 3 COO 2 ·2H 2 O (zinc acetate dihydrate), CH 4 N 2 O (urea) and NaBH 4 (Sodium borohydride) four powders are mixed evenly to obtain a mixed powder; the mixed powder is placed in a sintering furnace and heated to 500~900 in a nitrogen or inert gas protective atmosphere. o C is carbonized and reduced for 1 to 3 hours, and then cooled. After cooling, the sintered product is washed and dried to obtain the composite electrocatalyst.

[0010] Preferably, NiCl 2 6H 2 O and Zn(CH 3 COO 2 ·2H 2 The molar ratio of O is 1:4.2~3:1, NiCl 2 6H 2 O and Zn(CH 3 COO 2 ·2H 2 The sum of the masses of O and CH 4 N 2 The mass ratio of O is 1:1.6~1:6.3, NiCl 2 6H 2O and Zn(CH 3 COO 2 ·2H 2 The sum of the masses of O and NaBH 4 The mass ratio is 1:0.1~1:0.6.

[0011] Preferably, the heating rate of the sintering furnace is 5 to 10 o C / min.

[0012] Preferably, the sintered product is washed alternately with anhydrous ethanol and water until it becomes neutral.

[0013] Preferably, between 60 and 80 o C and vacuum dry for 6 to 10 hours.

[0014] Beneficial effects:

[0015] (1) The present invention provides Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase uses the interaction between the second phase of the transition metal alloy and the carbide matrix phase to adjust the electron spin density and charge distribution on the carbon, redistribute the valence electrons, and reduce |ΔG H* |, thereby accelerating the desorption of hydrogen atoms, relative to Ni 3 ZnC 0.7 , which can effectively increase the rate of hydrogen evolution reaction, that is, improve the electrocatalytic efficiency and reduce the cost of hydrogen production. 0.08 Ni 0.92 The introduction of alloys can improve the electrical conductivity of the surface of the composite electrocatalyst material, thereby further improving its hydrogen evolution catalytic activity.

[0016] (2) The process of preparing the composite electrocatalyst of the present invention by a one-step sintering method is simple and easy to operate, the raw materials are easily obtained, the cost is low, and it is easy to achieve large-scale preparation; and after carbonization sintering, the prepared composite electrocatalyst has excellent corrosion resistance and has good application prospects in alkaline water electrolysis to produce hydrogen.

[0017] (3) The present invention uses NaBH 4 As a reducing agent, Ni 2+ 、Zn 2+ Better reduction to generate Zn 0.08 Ni 0.92 In addition, by adjusting the ratio of raw materials, the Zn 0.08 Ni 0.92 The amount of alloy introduced can then be used to regulate the hydrogen evolution performance of the composite electrocatalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The Zn prepared in Example 1 0.08 Ni 0.92 / Ni 3 ZnC 0.7 X-ray diffraction (XRD) patterns of the composite electrocatalysts.

[0019] Figure 2 The Zn prepared in Example 1 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Transmission electron microscopy (TEM) images of the composite electrocatalyst at different magnifications.

[0020] Figure 3 The Zn prepared in Example 1 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Polarization curves of the composite electrocatalyst under alkaline conditions.

[0021] Figure 4 Ni prepared in Comparative Example 1 3 ZnC 0.7 Polarization curves of electrocatalysts under alkaline conditions. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, wherein the methods are conventional methods unless otherwise specified, and the raw materials can be obtained from public commercial channels unless otherwise specified.

[0023] Example 1

[0024] The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis is a kind of Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 , and its specific preparation steps are as follows:

[0025] 0.35 g NiCl 2 6H 2 O, 0.33 g Zn(CH 3 COO 2 ·2H 2 O, 2.7 g CH 4 N 2 O and 0.25 g NaBH 4The four kinds of powders were added into a mortar, ground and mixed evenly to obtain a mixed powder; the mixed powder was placed into a porcelain boat, and then the porcelain boat was placed in a sintering furnace under an argon protective atmosphere at 10 o C / min heating rate to 700 o C, at 700 o C for 2.5 h, then cool, take out the sintered product and grind it into powder with a mortar, then wash the ground powder with anhydrous ethanol and water alternately until it is neutral, and finally place it at 60 o C oven and dried in vacuum for 8 h to obtain Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Composite electrocatalysts.

[0026] Example 1 Preparation of Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 In the case of composite electrocatalyst, the molar ratio of Ni to Zn in the raw material is 1:1.

[0027] The Zn prepared in Example 1 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Phase characterization of composite electrocatalysts. Figure 1 The XRD spectrum test results show that at 44.2 o , 51.5 o , 75.8 o The diffraction peaks at 0.08 Ni 0.92 The (111), (200), and (220) crystal planes are at 42.7 o , 49.7 o , 73.1 o The diffraction peaks at correspond to Ni 3 ZnC 0.7 The (111), (200), and (220) crystal planes of Zn 0.08 Ni 0.92 Alloy and Ni 3 ZnC 0.7 Composite electrocatalysts of carbides.

[0028] The Zn prepared in Example 1 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Microscopic morphology of composite electrocatalysts. Figure 2The lower magnification TEM image shows that the composite catalyst has a morphology similar to carbon nanotubes, while the higher magnification TEM image shows that Zn 0.08 Ni 0.92 with Ni 3 ZnC 0.7 A heterogeneous structure is formed between them.

[0029] 5 mg of Zn prepared in Example 1 0.08 Ni 0.92 / Ni 3 ZnC 0.7 The composite electrocatalyst was dispersed in 100 μL of Nafion / isopropanol (volume ratio 1:50) mixed solution to prepare a suspension, and then 2 μL of the suspension was evenly dropped on a 0.0714 cm 2 The working electrode was made by drying the glassy carbon electrode. The working electrode was driven at 10 mA / cm in 1 mol / L KOH alkaline aqueous solution. 2 The overpotential required for cathode current density is 290mV. The test results are as follows Figure 3 shown.

[0030] Example 2

[0031] The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis is a kind of Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 , and its specific preparation steps are as follows:

[0032] 0.35 g NiCl 2 6H 2 O, 0.165 g Zn(CH 3 COO 2 ·2H 2 O, 2.7 g CH 4 N 2 O and 0.25 g NaBH 4 The four kinds of powders were added into a mortar, ground and mixed evenly to obtain a mixed powder; the mixed powder was placed into a porcelain boat, and then the porcelain boat was placed in a sintering furnace under an argon protective atmosphere at 10 o C / min heating rate to 700 o C, at 700 oC for 2.5 h, then cool, take out the sintered product and grind it into powder with a mortar, then wash the ground powder with anhydrous ethanol and water alternately until it is neutral, and finally place it at 60 o C oven and dried in vacuum for 8 h to obtain Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Composite electrocatalysts.

[0033] Example 2 Preparation of Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 In the case of composite electrocatalyst, the molar ratio of Ni to Zn in the raw material is 2:1.

[0034] 5 mg of Zn prepared in Example 2 0.08 Ni 0.92 / Ni 3 ZnC 0.7 The composite electrocatalyst was dispersed in 100 μL of Nafion / isopropanol (volume ratio 1:50) mixed solution to prepare a suspension, and then 2 μL of the suspension was evenly dropped on a 0.0714 cm 2 The working electrode was made by drying the glassy carbon electrode. The working electrode was driven at 10 mA / cm in 1 mol / L KOH alkaline aqueous solution. 2 The overpotential required for the cathodic current density is 303 mV.

[0035] Example 3

[0036] The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis is a kind of Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 , and its specific preparation steps are as follows:

[0037] 0.35 g NiCl 2 6H 2 O, 0.99 g Zn(CH 3 COO 2 ·2H 2 O, 2.7 g CH 4 N 2 O and 0.25 g NaBH 4The four kinds of powders were added into a mortar, ground and mixed evenly to obtain a mixed powder; the mixed powder was placed into a porcelain boat, and then the porcelain boat was placed in a sintering furnace under an argon protective atmosphere at 10 o C / min heating rate to 700 o C, at 700 o C for 2.5 h, then cool, take out the sintered product and grind it into powder with a mortar, then wash the ground powder with anhydrous ethanol and water alternately until it is neutral, and finally place it at 60 o C oven and dried in vacuum for 8 h to obtain Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Composite electrocatalysts.

[0038] Example 3 Preparation of Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 In the case of composite electrocatalyst, the molar ratio of Ni to Zn in the raw material is 1:3.

[0039] 5 mg of Zn prepared in Example 3 0.08 Ni 0.92 / Ni 3 ZnC 0.7 The composite electrocatalyst was dispersed in 100 μL of Nafion / isopropanol (volume ratio 1:50) mixed solution to prepare a suspension, and then 2 μL of the suspension was evenly dropped on a 0.0714 cm 2 The working electrode was made by drying the glassy carbon electrode. The working electrode was driven at 10 mA / cm in 1 mol / L KOH alkaline aqueous solution. 2 The overpotential required for the cathodic current density is 312 mV.

[0040] Example 4

[0041] The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis is a kind of Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 , and its specific preparation steps are as follows:

[0042] 0.35 g NiCl 2 6H 2 O, 0.66 g Zn(CH 3 COO2 ·2H 2 O, 2.7 g CH 4 N 2 O and 0.25 g NaBH 4 The four kinds of powders were added into a mortar, ground and mixed evenly to obtain a mixed powder; the mixed powder was placed into a porcelain boat, and then the porcelain boat was placed in a sintering furnace under an argon protective atmosphere at 10 o C / min heating rate to 700 o C, at 700 o C for 2.5 h, then cool, take out the sintered product and grind it into powder with a mortar, then wash the ground powder with anhydrous ethanol and water alternately until it is neutral, and finally place it at 60 o C oven and dried in vacuum for 8 h to obtain Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Composite electrocatalysts.

[0043] Example 4 Preparation of Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 In the case of composite electrocatalyst, the molar ratio of Ni to Zn in the raw material is 1:2.

[0044] 5 mg of Zn prepared in Example 4 was added 0.08 Ni 0.92 / Ni 3 ZnC 0.7 The composite electrocatalyst was dispersed in 100 μL of Nafion / isopropanol (volume ratio 1:50) mixed solution to prepare a suspension, and then 2 μL of the suspension was evenly dropped on a 0.0714 cm 2 The working electrode was made by drying the glassy carbon electrode. The working electrode was driven at 10 mA / cm in 1 mol / L KOH alkaline aqueous solution. 2 The overpotential required for the cathodic current density is 297 mV.

[0045] Example 5

[0046] The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis is a kind of Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 , and its specific preparation steps are as follows:

[0047] 0.35 g NiCl 2 6H 2 O, 1.32 g Zn(CH 3 COO 2 ·2H 2 O, 2.7 g CH 4 N 2 O and 0.25 g NaBH 4 The four kinds of powders were added into a mortar, ground and mixed evenly to obtain a mixed powder; the mixed powder was placed into a porcelain boat, and then the porcelain boat was placed in a sintering furnace under an argon protective atmosphere at 10 o C / min heating rate to 700 o C, at 700 o C for 2.5 h, then cool, take out the sintered product and grind it into powder with a mortar, then wash the ground powder with anhydrous ethanol and water alternately until it is neutral, and finally place it at 60 o C oven and dried in vacuum for 8 h to obtain Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Composite electrocatalysts.

[0048] Example 5 Preparation of Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 In the case of composite electrocatalyst, the molar ratio of Ni to Zn in the raw material is 1:4.

[0049] 5 mg of Zn prepared in Example 5 was added 0.08 Ni 0.92 / Ni 3 ZnC 0.7 The composite electrocatalyst was dispersed in 100 μL of Nafion / isopropanol (volume ratio 1:50) mixed solution to prepare a suspension, and then 2 μL of the suspension was evenly dropped on a 0.0714 cm 2 The working electrode was made by drying the glassy carbon electrode. The working electrode was driven at 10 mA / cm in 1 mol / L KOH alkaline aqueous solution. 2 The overpotential required for the cathodic current density is 317 mV.

[0050] Example 6

[0051] The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for hydrogen production by alkaline water electrolysis is a kind of Ni 3 ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn0.08 Ni 0.92 / Ni 3 ZnC 0.7 , and its specific preparation steps are as follows:

[0052] 0.35 g NiCl 2 6H 2 O, 0.11 g Zn(CH 3 COO 2 ·2H 2 O, 2.7 g CH 4 N 2 O and 0.25 g NaBH 4 The four kinds of powders were added into a mortar, ground and mixed evenly to obtain a mixed powder; the mixed powder was placed into a porcelain boat, and then the porcelain boat was placed in a sintering furnace under an argon protective atmosphere at 10 o C / min heating rate to 700 o C, at 700 o C for 2.5 h, then cool, take out the sintered product and grind it into powder with a mortar, then wash the ground powder with anhydrous ethanol and water alternately until it is neutral, and finally place it at 60 o C oven and dried in vacuum for 8 h to obtain Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 Composite electrocatalysts.

[0053] Example 6 Preparation of Zn 0.08 Ni 0.92 / Ni 3 ZnC 0.7 In the case of composite electrocatalyst, the molar ratio of Ni to Zn in the raw material is 3:1.

[0054] 5 mg of Zn prepared in Example 6 was added 0.08 Ni 0.92 / Ni 3 ZnC 0.7 The composite electrocatalyst was dispersed in 100 μL of Nafion / isopropanol (volume ratio 1:50) mixed solution to prepare a suspension, and then 2 μL of the suspension was evenly dropped on a 0.0714 cm 2 The working electrode was made by drying the glassy carbon electrode. The working electrode was driven at 10 mA / cm in 1 mol / L KOH alkaline aqueous solution. 2 The overpotential required for the cathodic current density is 306 mV.

[0055] Comparative Example 1

[0056] Ni for alkaline water electrolysis to produce hydrogen 3 ZnC0.7 The specific preparation steps of the electrocatalyst are as follows:

[0057] 0.33 g NiCl 2 6H 2 O, 0.07 g Zn(CH 3 COO 2 ·2H 2 O and 2.7 g CH 4 N 2 The three kinds of powders were added into a mortar, ground and mixed evenly to obtain a mixed powder; the mixed powder was placed into a porcelain boat, and then the porcelain boat was placed in a sintering furnace under an argon protective atmosphere at 10 o C / min heating rate to 700 o C, at 700 o C for 2.5 h, then cool, take out the sintered product and grind it into powder with a mortar, then wash the ground powder with anhydrous ethanol and water alternately until it is neutral, and finally place it at 60 o C oven and dried in vacuum for 8 h to obtain Ni 3 ZnC 0.7 Electrocatalyst.

[0058] 5 mg of Ni prepared in Comparative Example 1 was added 3 ZnC 0.7 The electrocatalyst was dispersed in 100 μL of Nafion / isopropanol (volume ratio 1:50) mixed solution to prepare a suspension, and then 2 μL of the suspension was evenly dropped on a 0.0714 cm 2 The working electrode was made by drying the glassy carbon electrode. The working electrode was driven at 10 mA / cm in 1 mol / L KOH alkaline aqueous solution. 2 The overpotential required for cathode current density is 330mV. The test results are as follows Figure 4 shown.

[0059] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis, characterized in that: The composite electrocatalyst is Ni3ZnC 0.7 Zn is introduced into the matrix 0.08 Ni 0.92 The second phase of the obtained complex has the chemical formula Zn 0.08 Ni 0.92 / Ni3ZnC 0.7 .

2. The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The molar ratio of Ni element to Zn element in the raw material used to prepare the composite electrocatalyst is 1:4.2-3:

1.

3. The composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The molar ratio of Ni element to Zn element in the raw material used to prepare the composite electrocatalyst is 1:2 to 2:

1.

4. The method for preparing the composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis according to claim 1 or 2, characterized in that: The following steps are included: The four powders of NiCl2·6H2O, Zn(CH3COO)2·2H2O, CH4N2O and NaBH4 are uniformly mixed to obtain a mixed powder; the mixed powder is placed in a sintering furnace, heated to 500-900°C for carbonization reduction for 1-3 hours under a nitrogen or inert gas protective atmosphere, and then cooled; after cooling, the sintered product is washed and dried to obtain the composite electrocatalyst.

5. The method for preparing the composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis according to claim 4, characterized in that: The molar ratio of NiCl2·6H2O to Zn(CH3 COO)2·2H2O is 1:4.2~3:1, the mass ratio of the sum of the masses of NiCl2·6H2O and Zn(CH3COO)2·2H2O to CH4N2O is 1:1.6~1:6.3, and the mass ratio of the sum of the masses of NiCl2·6H2O and Zn(CH3 COO)2·2H2O to NaBH4 is 1:0.1~1:0.

6.

6. The method for preparing the composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis according to claim 4, characterized in that: The heating rate of the sintering furnace is 5-10°C / min.

7. The method for preparing the composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis according to claim 4, characterized in that: The sintered product was washed alternately with anhydrous ethanol and water until it became neutral.

8. The method for preparing the composite electrocatalyst of nickel-zinc alloy and nickel-zinc carbide for producing hydrogen by alkaline water electrolysis according to claim 4, characterized in that: Vacuum dry at 60-80°C for 6-10 hours.

Images