CN-122013232-A - Nickel-molybdenum-based electrolyzed water catalytic electrode material, preparation method and application thereof

Abstract

The invention provides a preparation method and application of a nickel-molybdenum-sulfur/nickel-molybdenum catalytic electrode prepared by an in-situ etching method, and belongs to the technical direction of new material preparation in the field of hydrogen energy. The method comprises the key steps of immersing a nickel-molybdenum alloy substrate in a mixed solution containing sodium persulfate and ammonium sulfate for reaction, standing for a certain period of time, taking out, cleaning with deionized water, self-drying in air and the like. The preparation method has the advantages that the preparation of the electrode can be realized through one-step reaction, the operation is simple, the sodium persulfate and the ammonium sulfate which are safe and environment-friendly and have low cost are used as the etchant in the process, the preparation method has mild conditions, the high-temperature and high-pressure environment is not needed, the substrate can be soaked into the reaction solution, and the large-area production is facilitated. The obtained nickel-molybdenum-sulfur self-supporting electrode has higher electrochemical activity and stability, can obviously reduce the overpotential of the catalytic reaction, further reduces the working voltage and the overall energy consumption of the electrolytic tank, and has good industrialized application potential.

Inventors

• XU CHAOQUAN
• KONG FANXU
• WU DI

Assignees

• 四川能源发展集团有限责任公司
• 天府新能源研究院

Dates

Publication Date

20260512

Application Date

20251224

Claims (9)

1. 1. The nickel-molybdenum-based electrolyzed water catalytic electrode material is characterized by comprising nickel-molybdenum alloy serving as a substrate, wherein the surface of the nickel-molybdenum alloy is covered with a two-dimensional layered nickel-molybdenum-sulfur nano sheet structure.
2. 2. A preparation method of the nickel-molybdenum-based electrolytic water catalytic electrode material is characterized by comprising the following steps of firstly cleaning and preprocessing a nickel-molybdenum alloy substrate, then immersing the nickel-molybdenum alloy substrate in an etching aqueous solution containing sodium persulfate and ammonium sulfate for chemical etching reaction, cleaning a product by deionized water after etching, and naturally drying the product in a normal-temperature environment to finally obtain the composite electrode material grown on the surface of the nickel-molybdenum alloy by nickel-molybdenum-sulfur nano sheets.
3. 3. A process according to claim 2, wherein the concentration of the aqueous sodium persulfate solution is from 0.01 to 1mol/L.
4. 4. The method of claim 2, wherein the aqueous sodium persulfate solution is prepared by adding sodium sulfide and sulfur powder in the same mole into deionized water, performing ultrasonic dispersion, and stirring.
5. 5. A process according to claim 2, wherein the concentration of the aqueous ammonium sulfate solution is 0.01 to 1mol/L.
6. 6. A process according to claim 2, wherein the aqueous solution of ammonium sulfate is replaced by an aqueous solution of sodium sulfate or potassium sulfate.
7. 7. A process according to claim 2, wherein the nickel-molybdenum alloy used as the substrate is one or more of nickel-molybdenum alloy powder, nickel-molybdenum alloy sheet, nickel-molybdenum alloy foil, and foamed nickel-molybdenum alloy, preferably foamed nickel-molybdenum alloy. The nickel-molybdenum alloy is immersed in the aqueous solution of sodium persulfate and ammonium sulfate for 1-48 hours.
8. 8. A preparation method according to claim 2, wherein the specific steps are as follows: Firstly, immersing nickel-molybdenum alloy with the nickel-molybdenum ratio of 1:1 into hydrochloric acid solution for ultrasonic cleaning, removing residual acid liquor on the surface by using deionized water, then placing the nickel-molybdenum alloy into acetone for continuous ultrasonic treatment, and cleaning residual acetone by using deionized water after the treatment is finished. After the alloy sheet is naturally dried, immersing the alloy sheet into an aqueous solution containing sodium persulfate and ammonium sulfate for reacting for a specified period of time, taking out the alloy sheet, washing the alloy sheet by deionized water, and naturally drying the alloy sheet at room temperature.
9. 9. The application is characterized in that the nickel-molybdenum-sulfur nano sheet/nickel-molybdenum alloy composite electrode material prepared by the preparation method of claim 2 can form different composite materials with different surface components and structures by adjusting the ion proportion and the soaking time of etching aqueous solution, and the different composite materials are respectively used as positive electrode materials and negative electrode materials to be applied to electrolyzed water.

Description

Nickel-molybdenum-based electrolyzed water catalytic electrode material, preparation method and application thereof Technical Field The invention belongs to the technical field of electrolytic water hydrogen production electrode materials, and particularly relates to a nickel-molybdenum-based electrolytic water catalytic electrode material, a preparation method and application thereof. Background Currently, global energy supply is still highly dependent on fossil fuels, which account for over 80%. The development of renewable energy sources is quickened, the energy source system is promoted to transform towards green and sustainable directions, and the renewable energy source system has become a national important strategy. However, renewable energy sources such as solar energy and wind energy have intermittence and volatility, and are difficult to directly stabilize grid connection, so that the actual utilization rate of the renewable energy sources is low. In various electrochemical energy storage technologies, the hydrogen production by water electrolysis can realize the large-scale consumption of renewable energy sources, and becomes an important path for improving the utilization rate of the renewable energy sources. Along with the progress of technologies such as wind power, photovoltaic power generation and the like and the continuous decline of electric power cost, the water electrolysis hydrogen production technology is continuously optimized, the energy consumption is gradually reduced, and the water electrolysis hydrogen production cost driven by renewable energy is expected to approach the level of the traditional fossil fuel reforming hydrogen production, so that the water electrolysis hydrogen production technology has market competition potential. Electrocatalytic full water splitting hydrogen production is regarded as one of key technologies for coping with global energy challenges and reducing carbon emission as an efficient and clean hydrogen production mode. The development of large-scale, high-efficiency and long-life water electrolysis hydrogen production equipment has important strategic significance for promoting the progress of the hydrogen energy industry. The current technology for producing hydrogen by water electrolysis is limited in large-scale industrialized application due to high energy consumption and high cost. One of the key paths for improving the water electrolysis efficiency is to develop a high-activity hydrogen evolution and oxygen evolution catalyst. In the aspect of catalytic oxygen evolution reaction, iridium dioxide and ruthenium dioxide show excellent catalytic activity, but the corresponding metal elements have low crust abundance and high price, and are difficult to be widely used in commercial electrolyzed water systems. Therefore, the development of the electrolytic water electrode material which is low in cost, easy to prepare and high in catalytic activity has important practical significance. At present, when a powder catalyst is coated on the surface of a conductive substrate, the powder catalyst generally has two problems that on one hand, the interfacial resistance of the coating layer can be increased to restrict the improvement of the electrocatalytic performance, on the other hand, the adhesion between the catalyst and the substrate is insufficient to cause limited exposure of active sites, and meanwhile, the binder can be degraded due to environmental factors to cause difficult-to-predict side reactions. In contrast, the self-supported electrocatalyst is effective in avoiding the inherent drawbacks of the powder catalysts described above. When the self-supported catalyst is prepared by the traditional solvothermal method, various chemical reagents are often involved, the process steps are complicated, the reliability is low, and the preparation is usually carried out in a closed environment with high temperature and high pressure. The nickel-molybdenum-based water electrolysis catalyst has high-efficiency hydrogen evolution and oxygen evolution catalysis performance in alkaline electrolyte, and is one of industrial non-noble metal alkaline water electrolysis catalysts with great potential. Conventional water splitting technology generally needs to prepare two single-function catalysts of anodic oxygen evolution and cathodic hydrogen evolution respectively, which results in significant increase of development cost. Therefore, the development of the catalytic material with the dual-function activities of hydrogen evolution and oxygen evolution realizes the full/composite water decomposition driven by a single catalyst, and has remarkable advantages. The design can simplify the electrode preparation process, avoid mutual interference among different catalysts in operation, effectively reduce reaction potential and improve hydrogen production efficiency and device operation stability. Disclosure of Invention In order to overcome the defects in the prior