A novel synthesis strategy is demonstrated to prepare Mo P/Mo nanobelts with porous structure for the first time. The growth and formation mechanism of the porous Mo P/Mo nanobelt structure was disclosed by varying the contents of H /PH and the reaction temperature. During the hydrogen evolution reaction (HER) catalysis, the optimized porous Mo P/Mo nanobelts exhibited a small overpotential of 78 mV at a current density of 10 mA cm and a low Tafel slope of 43 mV dec , as well as long-term stability in alkaline media, surpassing Pt wire. Density functional theory (DFT) calculations reveal that the H O dissociation on the surface of Mo P is favorable during the HER.
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