Transition metal dichalcogenides(TMDs)recently attracted widespread attention due to their potential application to the electrocatalysis of the hydrogen evolution reaction(HER).However,their HER performance is far inf...Transition metal dichalcogenides(TMDs)recently attracted widespread attention due to their potential application to the electrocatalysis of the hydrogen evolution reaction(HER).However,their HER performance is far inferior to that of platinum(Pt)metal.Preparation of multi-elemental alloy and construction of heterostructure are considered as highly effective methods to enhance hydrogen production activity.Herein,a novel quaternary CoMoSSe alloy with heterostructure was synthesized on the surface of carbon black(CB)particles(CoMoSSe@CB)by a simple Sol-Gel process and thereafter served as HER catalyst.Compared to CoSe@CB and MoS2@CB electrocatalysts,CoMoSSe@CB exhibits superior HER activity with a low overpotential of 190 mV at-10 mA·cm^(-2) and a Tafel slope of 62 mV·dec^(-1).This improvement is attributed to the alloying effects among Co,Mo,S and Se,as well as the heterogeneous structure in the composite material,which regulate the electronic structure and intermediate free energy,thereby increasing the number of active sites and enhancing charge-transfer ability.This work can provide new ideas and concepts for designing novel and efficient TMD electrocatalysts.展开更多
基金Scientific Research and Innovation Team Program of Sichuan University of Science and Engineering(SUSE652B004,2024RC13)Special Basic Cooperative Research Programs of Yunnan Provincial Undergraduate Universities Association(202101BA070001-085)。
文摘Transition metal dichalcogenides(TMDs)recently attracted widespread attention due to their potential application to the electrocatalysis of the hydrogen evolution reaction(HER).However,their HER performance is far inferior to that of platinum(Pt)metal.Preparation of multi-elemental alloy and construction of heterostructure are considered as highly effective methods to enhance hydrogen production activity.Herein,a novel quaternary CoMoSSe alloy with heterostructure was synthesized on the surface of carbon black(CB)particles(CoMoSSe@CB)by a simple Sol-Gel process and thereafter served as HER catalyst.Compared to CoSe@CB and MoS2@CB electrocatalysts,CoMoSSe@CB exhibits superior HER activity with a low overpotential of 190 mV at-10 mA·cm^(-2) and a Tafel slope of 62 mV·dec^(-1).This improvement is attributed to the alloying effects among Co,Mo,S and Se,as well as the heterogeneous structure in the composite material,which regulate the electronic structure and intermediate free energy,thereby increasing the number of active sites and enhancing charge-transfer ability.This work can provide new ideas and concepts for designing novel and efficient TMD electrocatalysts.
