The Preparation Of Transition Metal Compound Grown On Ni Foam And Its Application Of Electrocatalytic Hydrogen Evolution

Hydrogen is considered as the cleanest renewable resource and the main substitute for fossil fuels in future energy supply.Sustainable hydrogen production is the main prerequisite for realizing the future hydrogen economy.The traditionally used Pt-based catalysts also have the advantages of low overpotential and fast reaction kinetics.However,the disadvantages such as high price and insufficient output have severely restricted the development of water splitting technology and its large-scale application.Therefore,the development of high-activity,low-cost non-noble metal electrocatalysts to break through this bottleneck has become an important research field at present.Based on the above discussion,this article uses nickel foam as a substrate to synthesize a vanadium-based compound and its composite catalyst with transition metal sulfide by a one-step hydrothermal method.The study also shows that the catalyst has good electrocatalytic hydrogen evolution performance.The main research contents are as follows:（1）The MoS2/V5S4/Ni3S2 composite with pom-like structure was successfully prepared by one-step hydrothermal method as a high-efficiency HER catalyst.By adjusting the ratio of Mo and V and increasing the amount of V,the morphology surface exposes more active sites,thereby accelerating the hydrogen evolution reaction kinetics.Studies have shown that this catalyst has excellent catalytic activity(the overpotential for hydrogen evolution is 88 m V at a current density of 10 m A cm^-2,and the Tafel slope is 66 m V dec^-1).（2）Using nickel foam as the substrate,ammonium persulfate as the initiator,and ammonium metavanadate as the source of vanadium,V2O5 nanoparticles were successfully synthesized on the foamed nickel by a one-step hydrothermal method with the introduction of phosphate,and named V:Pi/Ni（OH）2@NF.This nanoparticle structure has more catalytically active sites,thus It can effectively contact the electrolyte in the solution to make the catalytic material have excellent hydrogen evolution performance.Studies have shown that the hydrogen evolution overpotential of the catalyst at a current density of 10 m A cm^-2 is 75 m V,and the Tafel slope is 135m V dec^-1.（3）In order to further develop the practical application value of the catalyst material,we designed a hydrogen production device by electrolysis of water so that the existing materials in the laboratory or the materials prepared in the future can be applied to this device.Starting from the overall structure of the device,the device is comprehensively designed and optimized to achieve the purpose of hydrogen-oxygen separation and realize gas collection.In addition,the generated hydrogen can be passed into water to produce hydrogen-rich water,so that the catalyst has certain practical application value.