CuS@defect-rich MoS2 core-shell structure for enhanced hydrogen evolution

The catalytic activity of MoS 2 for hydrogen evolution reaction (HER) is closely-related to its active edge sites and electrical conductivity . In this work, a novel strategy to enhance HER by introducing defects into interface to take advantage of synergistic effect between them was reported. Specifically, in the first step, molybdenum disulfide (MoS 2 ) with additional active edge sites was prepared through defect engineering, and then copper sulphide(CuS)@defect-rich MoS 2 core-shell structure with better electron transport capability was constructed, thus achieving high-efficiency HER by synergistic effect. Benefiting from the additional active edge sites of the defect-rich MoS 2 and the improved charge transport facilitated by the intimate interface, CuS@defect-rich MoS 2 could afford a current density of 10 mA·cm −2 at a low overpotential of 135 mV and a Tafel slope of 50 mV·dec −1 , as well as relatively long-term stability.