Study On Preparation And Electrochemical Performance Of Mo-based Nanocomposites

Hydrogen energy is regarded as the cleanest renewable energy and has a pivotal position in the future energy supply.It is usually regarded as the main alternative to traditional fossil fuels.Efficient,stable,and environmentally friendly hydrogen production will become the key to the development of the hydrogen economy in the future.In the past few decades,the hydrogen evolution reaction（HER）,as a key step in the electrolysis of water to produce hydrogen,has restricted the rate of electrolysis of water to produce hydrogen,and has therefore become one of the research hotspots that domestic and foreign researchers have worked hard to overcome.Although Pt and other noble metal catalysts have good catalytic ability for HER,their own expensive price and scarce mineral reserves in the earth’s crust limit their large-scale development and utilization in modern industry.Mo-based composite catalysts have been extensively studied in recent years because of their similar electronic structure as the outermost layer of Pt elements and their ability to maintain high activity and stability in a wide p H range.The main content of this article is divided into two aspects:（1）The MoS₂/Mo P/C nanostructure composite materials were prepared by simple solution gel method and chemical vapor deposition method through using ammonium tetrathiomolybdate as the source of Mo and S,triethanolamine and citric acid as the complexing agent,and phosphoric acid as the source of P.The changes of HER properties of the materials prepared under different sulfur-phosphorus ratio conditions were investigated.The study found that when S:P=1:1,the prepared MoS₂/Mo P/C composite exhibits higher HER catalytic activity than other ratios.The overpotential when it reaches a current density of10 m A·cm^-2is 191 m V,and the Tafel slope is 112 m V·dec^-1.（2）The bulk NiMoP/C composite electrode materials were prepared by simple solution gel method and chemical vapor deposition method through using（NH₄）₆Mo₇O₂₄·4H₂O as the Mo source,Ni（NO₃）₂·6H₂O as the Ni source,and H₃PO₄as the P source.As the strong coupling between Ni-Mo produces a synergistic effect,the highly active NiMoP nanoparticles provide active sites in the HER reaction.In addition,the oxygen vacancies in the structure can also promote hydrogen adsorption;the combination with carbon conductive materials can be further optimized.The inherent electrical properties of the material.The NiMoP/C material exhibits excellent HER catalytic activity.It only needs an overpotential of 158 m V to reach a current density of 10 m A·cm^-2,and after1000 cycles,the overpotential is reduced to 149 m V,which shows the electrochemical activation process it can further improve the HER catalytic performance of the material,and the material also shows good stability in the40000 s chronopotentiometric test.