Synthesis Of V Doped Mo S₂ Nanosheets For Electrochemical Hydrogen Evolution Application

As a typical two-dimensional layered transition metal sulfide,Mo S₂ nanosheets areconsidered to be a promising electrocatalytic hydrogen evolution catalyst,but they have limitations of catalytic inert base surface and poor conductivity of intrinsic semiconductors.In this paper,Mo S₂ nanosheets with wide interlayer spacing were prepared,and V-Mo S₂ nanosheets with different doping ratios of 1T and 2H were prepared by doping vanadium?V?element as a catalytic material for electrochemical hydrogen evolution.The performance of hydrogen production is studied.In this thesis,Mo S₂ and V-Mo S₂ nanosheets were prepared by a simple hydrothermal synthesis method.The freshly prepared sample has the characteristics of mixing 1T and 2H phases.Through the doping of V,and the content of the 1T phase of the metal is increased,thereby achieving an efficient hydrogen evolution reaction?HER?.The structural characteristics of V?IV?&V?II?co-doping,mixed 1T&2H phases and wide interlayer expansion endow the nanosheets with plentiful disorders and rich defects,thereby resulting in abundant active sites.Furthermore,the V?IV?&V?II?co-doping brings in electronic benefits of narrowed bandgap,improved intrinsic conductivity and optimized hydrogen adsorption free energy of basal planes.By tuning the V dopant content,the 10%V-Mo S₂ catalyst shows an optimized HER performance with a low overpotential of 146 m V at 10 m A cm^-2,and a small Tafel slope of 48 m V dec^-1,long operation stability of 80 h.Our work opens up new opportunities for improving electrochemical HER performance of layered transition metal dichalcogenides?TMDs?by synergistic structural and compositional modulations.