Fabrication of MoS 2 ‐Decorated Nickel‐Cobalt Bimetal Phosphide Nanocubes as Efficient Electrocatalysts for Hydrogen Evolution

Abstract Nickel‐cobalt bimetal phosphides were prepared via the phosphidation treatment of NiCo‐based Prussian blue analogue (PBA). Subsequently, the core‐shell structures of NiCoP@MoS 2 were successfully assembled through a solvothermal reaction, where the NiCoP substrates were uniformly and randomly covered by MoS 2 nanosheets. The resulting hybrids exhibited significantly superior catalytic activities towards hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 to bare MoS 2 . The optimal catalyst afforded the best HER performance with a low overpotential of 138 mV at 10 mA cm −2 and Tafel slope of 78.1 mV dec −1 , together with high stability and durability. The excellent HER properties of hybrids mainly originated from the unique core‐shell architecture and the intrinsic natures of MoS 2 and PBA‐derived bimetal phosphides.