Edge‐Riched MoSe₂/MoO₂ Hybrid Electrocatalyst for Efficient Hydrogen Evolution Reaction

Molybdenum diselenide (MoSe 2 ) is widely considered as one of the most promising catalysts for the hydrogen evolution reaction (HER). However, the absence of active sites and poor conductivity of MoSe 2 severely restrict its HER performance. By introducing a layer of MoO 2 on Mo foil, MoSe 2 /MoO 2 hybrid nanosheets with an abundant edge and high electrical conductivity can be synthesized on the surface of Mo foil. Metallic MoO 2 can improve the charge transport efficiency of MoSe 2 /MoO 2 , thereby enhancing the overall HER performance. MoSe 2 /MoO 2 exhibits fast hydrogen evolution kinetics with a small overpotential of 142 mV versus RHE at a current density of 10 mA cm −2 and Tafel slope of 48.9 mV dec −1 .