Preparation of WS2/C composite material and its electrocatalytic hydrogen evolution performance

With H2WO4 and EDA as precursors, WO3/C intermediate is obtained by mechanical stirring and in-situ solid-phase pyrolysis, then WS2/C composite material is obtained by high temperature vulcanization. The WS2/C composite is characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and other instrumental analysis methods. At the same time, the electrocatalytic performance of the catalyst was analyzed by the electrocatalytic steady-state polarization curve (LSV), Tafel slope (Tafel), cycle stability (CP), electrochemical impedance (PEIS) and Electrochemically Active Surface Area (ECSA) tests of the material. The results showed that when the current density of the WS2/C composite is 10 mA/cm2, overpotential is 179 mV, and Tafel slope is 98 mV/dec.