In situ synthesis of heterogeneous NiSe₂/MoSe₂ nanocomposite for high‐efficiency electrocatalytic hydrogen evolution reaction

Abstract Developing high‐efficiency electrocatalysts for hydrogen evolution reaction (HER) has been considered as a crucial way to reduce energy loss in water‐splitting. Herein, heterogeneous NiSe 2 /MoSe (H‐NiSe ) nanocomposite constructed by metallic nanocrystallites embedded few‐layer MoSe nanosheets situ synthesized simple hydrothermal reaction. As an HER electrocatalyst, it delivers superior performance with ultra‐small onset overpotential of 103 mV, small 147 mV at 10 mA cm −2 , low Tafel slope 43.5 dec −1 and long‐term stability up 18 h 0.5 M H SO 4 . The can be ascribed the unique nanostructure, which not only improve overall conductivity but also greatly increase exposed active sites. Furthermore, synergistic effect hybrid facilitates rapid electrons transfer from electrode edges take part reaction, thus promotes performance. This study provides route fabricating bi‐metallic selenides‐based efficient stable electrocatalyst HER.