| As one of the clean energy sources,hydrogen energy is a new type of energy that is expected to replace fossil energy.Watter splitting is a clean and efficient hydrogen production technology.In the hydrogen evolution reaction,efficient catalysts can reduce the hydrogen evolution overpotential and save costs.Transition metal sulfdes（TMSs）have unique structural features,abundant active sites,and electronically tunable properties,and have attracted much attention in the field of electrocatalysis.Limited by problems such as slow reaction kinetics.The construction of heterointerfaces can better tune the adsorption/desorption energies and improve the kinetics of hydrogen evolution,which is a general method to optimize non-layered TMSs.In this paper,with the goal of preparing efficient hydrogen evolution catalysts,heterostructured Cu2S/Ni3S2 and Co S/Ni3S2 composite catalysts were prepared by a two-step hydrothermal method.The number of electrode active sites and its electrochemical performance of the law and mechanism.The main conclusions reached are as follows:（1）Cu2S/Ni3S2 and Co S/Ni3S2 composite electrodes with multiple active sites and large active specific surface area were constructed by a two-step hydrothermal method.Compared with Ni3S2,the number of active sites of the Cu2S/Ni3S2 complex increased by 1.94×10-4mol,the active specific surface area increased by 118%,the number of active sites of the Co S/Ni3S2complex increased by 2.08×10-4mol,and the active site was increased by2.08×10-4mol.The specific surface area is increased by 172%.（2）Compared with Ni3S2,the hydrogen evolution overpotential of Cu2S/Ni3S2 composite electrode decreased by 130m V at a current density of 10 m A·cm-2,and the gap with Pt/C electrode was 19m V.The hydrogen evolution overpotential of the Co S/Ni3S2 composite electrode is 113m V lower than that of the Ni3S2 catalyst,and the decrease rate of the hydrogen evolution activity is less than 1%after 2000 cycles.37 Figures,14 Tables,118 References... |
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