Alkaline hydrogen evolution catalyst for hydrogen production through water electrolysis and preparation method of alkaline hydrogen evolution catalyst

Abstract

The invention belongs to the technical field of hydrogen production through water electrolysis, and particularly relates to an alkaline hydrogen evolution catalyst for hydrogen production through water electrolysis and a preparation method of the alkaline hydrogen evolution catalyst. The alkaline hydrogen evolution catalyst is a MoPt2-Mo2C / NC nano composite material, a carrier is a nitrogen-doped carbon material, and a catalytic active component is MoPt2-Mo2C with a heterostructure; wherein the platinum-molybdenum intermetallic compound and the molybdenum carbide are uniformly distributed on the carrier nitrogen-doped carbon material; and a heterostructure is formed between the platinum-molybdenum intermetallic compound and the molybdenum carbide. The intermetallic compound and the molybdenum carbide are combined to form a heterostructure, the advantages of the intermetallic compound and the molybdenum carbide are combined, and the water dissociation kinetics is accelerated by utilizing the coordination of the ordered crystal lattice of the intermetallic compound and the electron coupling effect of the heterointerface of the intermetallic compound and the molybdenum carbide, so that the alkaline hydrogen evolution performance is further improved.

Description

Technical Field

[0001] This invention belongs to the technical field of hydrogen production by water electrolysis, specifically relating to an alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis and its preparation method. Background Technology

[0002] While traditional hydrogen production processes that extract hydrogen from fossil fuels through chemical reactions are mature, fossil fuel reserves are limited and pose carbon emission problems. In the long run, water electrolysis, which uses electricity to split water, is more easily integrated with renewable energy sources, is cleaner and more sustainable, and represents the most promising green hydrogen supply method. Common water electrolysis hydrogen production technologies include proton exchange membrane electrolysis, solid oxide electrolysis, and alkaline environment hydrogen production. Alkaline environment hydrogen production is mainly achieved through the electrolysis of alkaline aqueous solutions (such as KOH or NaOH solutions). Alkaline hydrogen production technology is highly mature, has stable processes, long equipment lifespan, and compared to other technologies, it is lower in cost, simpler to maintain, and suitable for large-scale continuous production.

[0003] However, hydrogen production under alkaline conditions involves multiple steps, including water dissociation and hydrogen adsorption / desorption, resulting in high energy barriers. For example, the water dissociation energy barrier needs to be overcome to provide protons, leading to slow reaction kinetics. Therefore, in alkaline water electrolysis for hydrogen production, highly efficient catalysts are required to reduce overpotential and increase the hydrogen evolution reaction rate. Alkaline hydrogen evolution catalysts have thus become one of the core materials, directly affecting hydrogen production efficiency, energy consumption, and cost.

[0004] Currently, the commonly used hydrogen evolution catalyst for water electrolysis is the Pt / C catalyst. Although Pt is the benchmark catalyst in the hydrogen evolution reaction, due to the high cost and scarce reserves of precious metals, Pt-based catalysts are gradually being replaced by non-precious metals.

[0005] In the field of basic hydrogen evolution reaction (HER) catalysts, heterostructure catalysts have attracted much attention due to their ability to provide abundant active sites and generate significant synergistic effects at the heterostructure interface, thereby effectively improving the HER rate in alkaline environments. However, the performance improvement of heterostructure catalysts is often limited by interfacial stability issues (such as component dissolution) and the complexity of interfacial engineering, which may affect their efficiency in long-term operation. On the other hand, intermetallic compounds are known for their excellent conductivity and highly tunable electronic structure, which can significantly promote electron transfer in electrochemical reactions, making them one of the ideal candidate materials for high-performance HER catalysts. Currently, intermetallic compound catalysts used in basic HER still face challenges in large-scale applications, such as the high cost of precious metals, the tendency for particle sintering and growth under harsh synthesis conditions, and the potential dissolution of non-precious metal components. Therefore, it is crucial to develop novel basic HER catalyst systems that combine high activity, excellent stability, and cost-effectiveness.

[0006] CN119392295A discloses a platinum-nickel supported molybdenum carbide / molybdenum dioxide nanocomposite material, its preparation method, and its application. This patent first prepares a Mo2C / MoO2 substrate material with a heterostructure using molybdenum salt and a coordinating agent as raw materials. Then, PtNi is loaded onto the Mo2C / MoO2 substrate material to prepare the platinum-nickel supported molybdenum carbide / molybdenum dioxide nanocomposite material. The Mo2C / MoO2 nanomaterial carrier effectively anchors the PtNi alloy, further improving the catalytic stability of the material. Furthermore, the electronic coupling and interfacial synergistic effect provided by the heterogeneous interface can enhance the reactivity of active sites, maximizing the catalytic performance of the material and further reducing the cost of hydrogen production under acidic conditions. While Pt-based alloys are common catalytic materials and exhibit some activity in the hydrogen evolution reaction, compared to intermetallic compounds, their atomic arrangement is often disordered or short-range ordered. Over long-term catalytic cycling, aggregation or segregation may occur, leading to the loss of active sites and decreased stability. Moreover, the performance of this material in alkaline hydrogen evolution is currently unknown, limiting its application scope.

[0007] CN110227523A discloses a method for preparing a carbon-supported alpha-phase molybdenum carbide-molybdenum phosphide nanocomposite material. This patent provides a carbon-supported alpha-phase molybdenum carbide-molybdenum phosphide nanocomposite material. The molybdenum carbide-molybdenum phosphide heterojunction nanodots in this composite material are uniformly small in size, which is beneficial for exposing catalytic active sites. Furthermore, the preparation method can simultaneously achieve the phosphating-carbonization process, preparing the carbon-supported alpha-phase molybdenum carbide-molybdenum phosphide nanodot heterojunction in one step. However, the catalyst in this patent is entirely based on non-noble metals, resulting in an activity bottleneck. Although both MoC and MoP possess certain HER activity, they lack equivalent high-efficiency active sites, and their intrinsic activity is far lower than that of noble metal-based catalysts. Summary of the Invention

[0008] The purpose of this invention is to provide an alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis and its preparation method, which addresses the above-mentioned defects. The alkaline hydrogen evolution catalyst is a composite material of MoPt2-Mo2C with a heterostructure supported on nitrogen-doped carbon.

[0009] This invention combines an intermetallic compound with molybdenum carbide to form a heterostructure, which not only combines the advantages of both, but also utilizes the ordered lattice of the intermetallic compound and the electronic coupling effect of the heterostructure interface of molybdenum carbide to accelerate water dissociation kinetics and further improve the alkaline hydrogen evolution performance.

[0010] The technical solution of this invention is as follows: An alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis is disclosed. The catalyst is a MoPt2-Mo2C / NC nanocomposite material with nitrogen-doped carbon material as the support and MoPt2-Mo2C with a heterostructure as the catalytic active component.

[0011] In this material, platinum-molybdenum intermetallic compounds and molybdenum carbide are uniformly distributed on a nitrogen-doped carbon support; and a heterostructure is formed between the platinum-molybdenum intermetallic compounds and molybdenum carbide.

[0012] The nitrogen-doped carbon support used has N sites that can better anchor the heterostructured MoPt2-Mo2C loaded on it, preventing it from migrating and agglomerating during thermal annealing and resulting in excessive size.

[0013] Furthermore, in the MoPt2-Mo2C / NC nanocomposite material, the Pt content is 2%~10% by mass percentage, the Mo content is 3%~12%, and the content of the nitrogen-doped carbon support material is 78%~95%.

[0014] The Pt content in the catalyst described in this invention is controlled to be below 10%, which ensures catalytic effect while reducing the amount of precious metals used to lower costs. The Mo content is controlled to ensure that it can both combine with Pt and undergo carbonization to form molybdenum carbide.

[0015] Preferably, in the MoPt2-Mo2C / NC nanocomposite material, the Pt content is 5%~7% by mass percentage, the Mo content is 7%~10%, and the content of the nitrogen-doped carbon support material is 83%~88%.

[0016] The preparation method of the above-mentioned alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis includes the following steps: First, polyaniline was prepared using aniline and ammonium persulfate, and then the polyaniline was carbonized to obtain a nitrogen-doped carbon material as a support. Then, the nitrogen-doped carbon material prepared by impregnation with ammonium molybdate solution was calcined in nitrogen after the solvent was evaporated to form MoO2 / NC material. Finally, the MoO2 / NC material prepared by impregnation with chloroplatinic acid solution was annealed in an H2 / Ar atmosphere after the solvent was removed to obtain the MoPt2-Mo2C / NC composite material, which is the alkaline hydrogen evolution catalyst.

[0017] Furthermore, the preparation method of the alkaline hydrogen evolution catalyst for water electrolysis to produce hydrogen includes the following specific steps: (1) Preparation of polyaniline-derived nitrogen-doped carbon materials (NC carriers): A hydrochloric acid solution of aniline and a hydrochloric acid solution of ammonium persulfate were mixed and stirred to react. The mixture was then filtered, washed with deionized water until neutral, and dried in a vacuum oven to obtain polyaniline.

[0018] The dried polyaniline was placed into a ceramic boat, which was then placed in a tube furnace and carbonized under an inert gas atmosphere at 700-900°C to obtain the NC carrier.

[0019] (2) Preparation of MoO2 / NC materials: The NC carrier obtained in step (1) is mixed with deionized water, ultrasonicated to disperse it evenly, and then an ammonium molybdate aqueous solution with a concentration of 30-50 mmol / L is added dropwise and stirred evenly to obtain a mixed solution.

[0020] The mixed solution is placed in a water bath at 60-80°C and heated under stirring until the solvent evaporates completely to obtain a solid material.

[0021] The obtained solid material was placed in a tube furnace, inert gas was introduced, and annealing was performed at 400~550°C to obtain MoO2 / NC material.

[0022] (3) Preparation of MoPt2-Mo2C / NC composite material: The MoO2 / NC material obtained in step (2) was mixed with deionized water and ultrasonically dispersed evenly. A chloroplatinic acid solution with a concentration of 45-100 mmol / L was added dropwise, stirred evenly, and then freeze-dried to remove the solvent to obtain a solid material.

[0023] The obtained solid material was placed in a tube furnace and annealed in a reducing atmosphere at 800~1200°C to obtain the MoPt2-Mo2C / NC composite material.

[0024] Research has shown that by controlling the annealing temperature within the specified range, atoms can overcome energy barriers to achieve a disordered to ordered arrangement, resulting in MoPt2 with an atomic ratio of 1:2.

[0025] Furthermore, in step (1), the mass fraction of the aniline hydrochloric acid solution is 2-5%; the molar ratio of aniline to ammonium persulfate is 4:1. During synthesis, the molar ratio of aniline to ammonium persulfate is mainly controlled to be 4:1.

[0026] Furthermore, in step (1), the stirring speed is 200~1000 rpm / min; the drying temperature is 20~30°C; and the drying time is 8~20h; the inert gas in step (1) is argon or nitrogen.

[0027] Furthermore, in step (2), the stirring speed is 200~1000 rpm / min; the inert gas in step (2) is argon or nitrogen; the flow rate of the inert gas is 20~150 mL / min, and the heating rate of the tube furnace is 2~10°C / min.

[0028] Furthermore, in step (3), the stirring speed is 200~1000 rpm / min, and the freeze-drying temperature is -85~-75°C.

[0029] Furthermore, the reducing gas in step (3) is a hydrogen-argon mixture, wherein the proportion of hydrogen is 2-10%; the annealing temperature in step (3) is 800-1200°C; the flow rate of the reducing gas is 20-150 mL / min; and the heating rate of the tube furnace is 2-10°C / min.

[0030] The beneficial effects of this invention are as follows: The alkaline hydrogen evolution catalyst for water electrolysis described in this invention combines the advantages of intermetallic compounds and molybdenum carbide, significantly improving the alkaline hydrogen evolution performance of the catalyst through the electronic coupling effect of the heterogeneous interface. Furthermore, this composite electrode material reduces the amount of precious metals used, helping to lower costs and improve the material's economic viability and market competitiveness. Moreover, the preparation process of this composite material is relatively simple and convenient, facilitating large-scale production and promotion, and aligning with current societal demands for green and low-carbon energy and the concept of sustainable development.

[0031] The catalyst described in this invention has a platinum content of 2% to 10 wt%. When used in alkaline water electrolysis, it achieves an efficiency of 10 mA·cm⁻¹ in a 1 mol / L KOH electrolyte. -2 The current density requires only a 17mV overpotential, while currently commercial Pt / C (20wt% platinum content) requires 10mA·cm⁻¹. -2 The current density requires an overpotential of at least 28 mV, which demonstrates that the alkaline hydrogen evolution catalyst described in this invention is significantly superior to the hydrogen evolution performance of commercial Pt / C catalysts. Attached Figure Description

[0032] Figure 1 The image shows the XRD pattern of the MoPt2-Mo2C / NC nanocomposite material prepared in Example 1 of this invention.

[0033] Figure 2 This is a TEM image of the MoPt2-Mo2C / NC nanocomposite material prepared in Example 1 of the present invention.

[0034] Figure 3 This is a comparison of the polarization curves of the MoPt2-Mo2C / NC catalyst prepared in Example 1 of this invention and the commercial Pt / C catalyst in 1 mol / L KOH electrolyte.

[0035] Figure 4 This is a comparison of the stability of the MoPt2-Mo2C / NC catalyst prepared in Example 1 of this invention and the commercial Pt / C catalyst in 1 mol / L KOH electrolyte.

[0036] Figure 5 This is a comparison of the mass activity of the MoPt2-Mo2C / NC nanocomposite material prepared in Example 1 of the present invention and the commercial Pt / C catalyst in 1 mol / L KOH electrolyte.

[0037] Figure 6 This is a comparison of the mass activity of the MoPt2-Mo2C / NC nanocomposite material prepared in Example 2 of the present invention and the commercial Pt / C catalyst in 1 mol / L KOH electrolyte.

[0038] Figure 7 This is a comparison of the mass activity of the MoPt2-Mo2C / NC nanocomposite material prepared in Example 3 of the present invention and the commercial Pt / C catalyst in 1 mol / L KOH electrolyte.

[0039] Figure 8 The image shows the XRD pattern of the nanocomposite material prepared in Comparative Example 1. Detailed Implementation

[0040] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] 1. All electrochemical tests were performed on a Shanghai Chenhua CHI 760E electrochemical workstation at room temperature. Basic HER performance was tested in 1 mol / L KOH under a standard three-electrode system. A carbon rod (for HER linear sweep voltammetry) or platinum foil (for HER long-term stability testing) was used as the counter electrode, and an Hg / HgO electrode was used as the reference electrode. The potential was converted to reversible hydrogen electrode (RHE), with the following relationship: E RHE =E Hg / HgO +0.059×pH+0.098V. Linear sweep voltammetry (LSV) curves were tested at a scan rate of 5 mV / s.

[0042] Example 1 The alkaline hydrogen evolution catalyst for water electrolysis to produce hydrogen is a MoPt2-Mo2C / NC nanocomposite material, with nitrogen-doped carbon material as the support and MoPt2-Mo2C having a heterostructure as the catalytically active component.

[0043] In this MoPt2-Mo2C / NC nanocomposite material, the Pt content is 7% by mass percentage, the Mo content is 10%, and the content of the nitrogen-doped carbon support material is 83%.

[0044] The preparation method of the alkaline hydrogen evolution catalyst includes the following specific steps: (1) Preparation of polyaniline-derived nitrogen-doped carbon materials (NC carriers): 50 mL of hydrochloric acid solution (1M) containing 1458 μL aniline and 50 mL of hydrochloric acid solution (1M) containing 0.913 g ammonium persulfate were mixed and stirred at a stirring rate of 500 rpm / min. The mixture was then filtered, washed with deionized water until neutral, and dried in a vacuum oven at 25°C for 15 h to obtain polyaniline.

[0045] The dried polyaniline was placed in a ceramic boat, which was then placed in a tube furnace and carbonized at 800°C under nitrogen protection to obtain the NC carrier.

[0046] (2) Preparation of MoO2 / NC materials: Mix 60 mg of the NC carrier obtained in step (1) with 25 mL of deionized water, sonicate to disperse evenly, add 223 μL of ammonium molybdate aqueous solution with a concentration of 40 mmol / L, stir evenly to obtain a mixed solution.

[0047] The mixed solution was placed in a water bath at 70°C and heated under stirring at 600 rpm / min until the solvent was completely evaporated, thus obtaining a solid material.

[0048] The obtained solid material was placed in a tube furnace, nitrogen was introduced at a gas flow rate of 40 mL / min, and the temperature was increased to 500°C at a heating rate of 5°C / min for annealing to obtain MoO2 / NC material.

[0049] (3) Preparation of MoPt2-Mo2C / NC composite material: Mix 60 mg of the MoO2 / NC material obtained in step (2) with 30 mL of deionized water and ultrasonically disperse it evenly; add 215 μL of chloroplatinic acid solution with a concentration of 100 mmol / L, stir evenly at a speed of 600 rpm / min, and freeze dry at -80℃ to remove the solvent to obtain solid material.

[0050] The obtained solid material was placed in a tube furnace and annealed at 800°C in a reducing H2 / Ar mixed gas to obtain the MoPt2-Mo2C / NC composite material. The hydrogen content of the H2 / Ar mixed gas was 5%, the gas flow rate was 40 mL / min, and the heating rate was 5°C / min.

[0051] The alkaline hydrogen evolution catalyst obtained in this example was used for alkaline water electrolysis, achieving an efficiency of 10 mA·cm⁻¹ in a 1 mol / L KOH electrolyte. -2 The current density requires only a 17mV overpotential.

[0052] pass Figure 1 It can be seen that the peak around 23° is a characteristic peak of nitrogen-doped carbon, while the other peaks correspond to the peaks of MoPt2 and Mo2C.

[0053] Depend on Figure 2 It can be seen that by measuring the two adjacent lattice fringes, 0.224 nm corresponds to the (101) crystal plane of MoPt2, and 0.237 nm corresponds to the (111) crystal plane of Mo2C. The platinum-molybdenum intermetallic compound and molybdenum carbide constitute a heterostructure.

[0054] pass Figure 3 It can be seen that, under the same current density conditions, the MoPt2-Mo2C / NC material exhibits a significantly lower overpotential compared to commercial Pt / C catalysts.

[0055] pass Figure 4 It can be seen that the MoPt2-Mo2C / NC material at 10 mA·cm -2 After 20 hours of testing at current density, the voltage curve showed almost no change, indicating its excellent stability.

[0056] pass Figure 5 It can be seen that when the overpotential reaches 100mV, the mass activity of the obtained MoPt2-Mo2C / NC material is 5.64 A·mg. Pt -1 It is superior to the 0.74 A·mg of commercial Pt / C. Pt -1 .

[0057] Example 2 The difference from Example 1 is that the annealing temperature in step (3) is 900°C, while the rest is the same as in Example 1.

[0058] pass Figure 6 It can be seen that when the overpotential reaches 100mV, the mass activity of the obtained MoPt2-Mo2C / NC material is 1.6A·mg. Pt -1 It is superior to the 0.74 A·mg of commercial Pt / C. Pt -1 .

[0059] Example 3 The difference from Example 1 is that the annealing temperature in step (3) is 1000°C, while the rest is the same as in Example 1.

[0060] pass Figure 7 It can be seen that when the overpotential reaches 100mV, the mass activity of the obtained MoPt2-Mo2C / NC material is 1.54 A·mg. Pt -1 It is superior to the 0.74 A·mg of commercial Pt / C. Pt -1 .

[0061] Example 4 The difference from Example 1 is that the carbonization temperature of the tubular furnace in step (1) is 750°C, while the rest is the same as in Example 1.

[0062] Example 5 The difference from Example 1 is that the carbonization temperature of the tubular furnace in step (1) is 850°C, while the rest is the same as in Example 1.

[0063] Example 6 The difference from Example 1 is that the concentration of the ammonium molybdate aqueous solution in step (2) is 30 mmol / L, while the rest is the same as in Example 1.

[0064] Example 7 The difference from Example 1 is that the concentration of the ammonium molybdate aqueous solution in step (2) is 35 mmol / L, while the rest is the same as in Example 1.

[0065] Example 8 The difference from Example 1 is that the concentration of the ammonium molybdate aqueous solution in step (2) is 45 mmol / L, while the rest is the same as in Example 1.

[0066] Example 9 The difference from Example 1 is that the concentration of the ammonium molybdate aqueous solution in step (2) is 50 mmol / L, while the rest is the same as in Example 1.

[0067] Example 10 The difference from Example 1 is that the temperature of the water bath in step (2) is 65°C, while the rest is the same as in Example 1.

[0068] Example 11 The difference from Example 1 is that the temperature of the water bath in step (2) is 75°C, while the rest is the same as in Example 1.

[0069] Example 12 The difference from Example 1 is that the concentration of chloroplatinic acid solution in step (3) is 90 mmol / L, while the rest is the same as in Example 1.

[0070] Example 13 The difference from Example 1 is that the concentration of chloroplatinic acid solution in step (3) is 95 mmol / L, while the rest is the same as in Example 1.

[0071] Example 14 The difference from Example 1 is that the concentration of chloroplatinic acid solution in step (3) is 45 mmol / L, while the rest is the same as in Example 1.

[0072] Example 15 The difference from Example 1 is that the concentration of chloroplatinic acid solution in step (3) is 50 mmol / L, while the rest is the same as in Example 1.

[0073] Comparative Example 1 The difference from Example 1 is that the annealing temperature in step (3) is 600°C, while the rest is the same as in Example 1.

[0074] pass Figure 8 It is known that molybdenum carbide cannot be formed at 600°C, which means that the target material MoPt2-Mo2C / NC nanocomposite material described in this invention cannot be obtained.

Claims

1. An alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis, characterized in that, The catalyst is a MoPt2-Mo2C / NC nanocomposite material, with nitrogen-doped carbon material as the support and MoPt2-Mo2C having a heterostructure as the catalytically active component. In this material, platinum-molybdenum intermetallic compounds and molybdenum carbide are uniformly distributed on a nitrogen-doped carbon support; and a heterostructure is formed between the platinum-molybdenum intermetallic compounds and molybdenum carbide.

2. The alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 1, characterized in that, In the MoPt2-Mo2C / NC nanocomposite material, the Pt content is 2%~10%, the Mo content is 3%~12% by mass percentage, and the content of the nitrogen-doped carbon support material is 78%~95%.

3. The alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 2, characterized in that, In the MoPt2-Mo2C / NC nanocomposite material, the Pt content is 5%~7%, the Mo content is 7%~10%, and the content of the nitrogen-doped carbon support material is 83%~88% by mass percentage.

4. A method for preparing an alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis as described in any one of claims 1-3, characterized in that, Includes the following steps: First, polyaniline was prepared using aniline and ammonium persulfate, and then the polyaniline was carbonized to obtain a nitrogen-doped carbon material as a support. Then, the nitrogen-doped carbon material prepared by impregnation with ammonium molybdate solution was calcined in nitrogen after the solvent was evaporated to form MoO2 / NC material. Finally, the MoO2 / NC material prepared by impregnation with chloroplatinic acid solution was annealed in an H2 / Ar atmosphere after the solvent was removed to obtain the MoPt2-Mo2C / NC composite material, which is the alkaline hydrogen evolution catalyst.

5. The method for preparing the alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 4, characterized in that, The specific steps are as follows: (1) Preparation of nitrogen-doped carbon materials derived from polyaniline: A hydrochloric acid solution of aniline and a hydrochloric acid solution of ammonium persulfate were mixed, stirred, reacted, filtered, washed, and dried to obtain polyaniline. The dried polyaniline was placed into a ceramic boat, which was then placed in a tube furnace and carbonized under an inert gas atmosphere at 700-900°C to obtain the NC carrier. (2) Preparation of MoO2 / NC materials: The NC carrier obtained in step (1) was mixed with deionized water and ultrasonically dispersed evenly; an ammonium molybdate aqueous solution with a concentration of 30-50 mmol / L was added dropwise and stirred evenly to obtain a mixed solution; The mixed solution was placed in a water bath at 60-80°C and heated under stirring until the solvent was completely evaporated to obtain a solid material. The obtained solid material was placed in a tube furnace, inert gas was introduced, and annealing was performed at 400~550°C to obtain MoO2 / NC material. (3) Preparation of MoPt2-Mo2C / NC composite material: The MoO2 / NC material obtained in step (2) was mixed with deionized water and ultrasonically dispersed evenly; a chloroplatinic acid solution with a concentration of 45-100 mmol / L was added dropwise, stirred evenly, and then freeze-dried to remove the solvent to obtain a solid material; The obtained solid material was placed in a tube furnace and annealed in a reducing gas atmosphere at 800~1200°C to obtain the MoPt2-Mo2C / NC composite material.

6. The method for preparing the alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 5, characterized in that, The mass fraction of the aniline hydrochloric acid solution in step (1) is 2-5%; the molar ratio of aniline to ammonium persulfate is 4:

1.

7. The method for preparing the alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 5, characterized in that, In step (1), the stirring speed is 200~1000 rpm / min; the drying temperature is 20~30°C; and the drying time is 8~20h. The inert gas in step (1) is argon or nitrogen.

8. The method for preparing the alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 5, characterized in that, The stirring speed in step (2) is 200~1000 rpm / min; The inert gas in step (2) is argon or nitrogen; the flow rate of the inert gas is 20~150mL / min, and the heating rate of the tube furnace is 2~10°C / min.

9. The method for preparing the alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 5, characterized in that, The stirring speed in step (3) is 200~1000 rpm / min, and the freeze-drying temperature is -85~-75°C.

10. The method for preparing the alkaline hydrogen evolution catalyst for hydrogen production by water electrolysis according to claim 5, characterized in that, The reducing gas in step (3) is a hydrogen-argon mixture, wherein the proportion of hydrogen is 2-10%. The annealing temperature in step (3) is 800~1200°C; the flow rate of the reducing gas is 20~150mL / min; and the heating rate of the tube furnace is 2~10°C / min.

Images