Nanosheet array of Cu,Co and S /Mo foil composite material, preparation method and application thereof
Over the years, the massive use of fossil fuels has brought serious environmental problems to people. For example, haze, acid rain, and the warming global climate are all related to the long-term and heavy use of fossil fuels. In addition, coal, natural gas and oil and other fossil fuels are not renewable energy because they are difficult to be regenerated in a short period of time. Therefore, in the near future, human beings will inevitably face the problem of fossil fuel depletion. Therefore, the development of efficient, clean and renewable energy has become a scientific imperative in the 21st century.
Hydrogen is one of the most promising candidates for replacing traditional fossil fuels in the future. Hydrogen has a high calorific value of combustion, high energy density, only water is generated after combustion, and hydrogen is abundant on earth. So hydrogen is an excellent renewable and clean energy source. However, there are still many limitations and bottlenecks in the large-scale application of hydrogen as energy, among which how to effectively produce hydrogen is an important problem to be solved.
At present, pure hydrogen can be produced by hydrogen evolution reaction based on electrolytic water cathode. Due to the advantages of simple preparation conditions, mild and easy availability of raw materials, electrolysis of water hydrogen production has attracted great attention. However, because of the existence of overpotential of hydrogen evolution reaction, the energy consumption in the process of hydrogen production from electrolytic water is too high, which makes its actual use efficiency is low and limits the practical application of the process of hydrogen production from electrolytic water, which requires efficient electrocatalyst to reduce the overpotential of hydrogen evolution reaction.
At present, there are known high efficient catalysts for hydrogen evolution, such as Pt, Pd and other precious metals, but their high price and limited reserves restrict their large-scale application in industrial production. Therefore, it is necessary to develop materials with high catalytic capacity and low price to catalyze hydrogen evolution reaction, so as to realize the large-scale application of electrolysis water hydrogen production process.
In recent years, scientists have found through research that the binding energy of transition metal sulfide with hydrogen is similar to that of precious metal, which theoretically has catalytic performance of hydrogen evolution reaction. Moreover, due to its low price and abundant reserves, transition metal sulfide is an ideal material to replace precious metal as catalyst for electrocatalytic hydrogen evolution reaction. However, the transition metal sulfide in the block has a small specific surface area, few catalytic active sites, and low electron transport performance, so the catalytic activity is not high.
A sulfur nanometer copper and cobalt slice of array/molybdenum foil composite material, the excellent electrical conductivity of molybdenum foil surface made by sulfur particles of copper and cobalt nano array, effectively increase the materials of the catalytic sites, the electrode materials and electrolyte, the contact area and the electrical conductivity of the material, so that the preparation of molybdenum strip composite material has good catalytic performance water electrolysis hydrogen evolution reaction.
The preparation method of molybdenum foil composite material, the preparation process is simple, the required material is easy to obtain, the price is low, the experimental equipment and operating conditions are simple, the reaction is controllable and easy to large-scale production.
Application of Cu, Co and S nanosheet array/Mo strip composite as catalyst for electrolysis of water for hydrogen evolution.
1) Place the molybdenum foil in a solution containing Cu2+, Co2+ and urea, heat the reaction, after the reaction, remove the molybdenum foil and clean it;
2) Calcining the cleaned molybdenum foil in muffle furnace to obtain CuCo2O4 nanosheet array/molybdenum foil composite material;
3) Place the CuCo2O4 nanosheet array/molybdenum foil/ molybdenum strip composite prepared in Step 2 in thioacetamide solution, heat the reaction, cool to room temperature after the reaction, remove the molybdenum foil, wash and dry, and obtain the copper, cobalt and sulfur nanosheet array/molybdenum foil composite.
We can customize molybdenum foil/molybdenum strip according to customer requirements.
