▎ 摘　　要

Fabrication of efficient electrocatalysts for hydrogen evolution reaction (HER) is important to produce hydrogen fuel on a large scale via electrocatalytic water splitting. In this research, a novel electrocatalyst based on star-like molybdenum phosphide structure vertically grown on highly conductive graphene supported by a three-dimensional nickel foam (MoP/GR/NF) was synthesized via a facile hydrothermal method followed by a phosphidization strategy at 300 degrees C. The exclusive hierarchical nanostructure with abundant porosity was beneficial for enhancing active site numbers and electrical conductivity. In particular, the formation of Mo-P impressively changed electronic structure of the resulting material, thereby accelerating electrocatalytic activity for HER in 1.0 M KOH medium. The MoP/GR/NF required small overpotentials of 95 and 189 mV to deliver current densities of 10 and 50 mA cm(-2), respectively. In addition, it also demonstrated a Tafel slope of 54 mV dec(-1), which was significantly smaller than that of the GR/NF, Mo-O/GR/NF, and Mo-P/NF. Furthermore, there was negligible decrease of current response and overpotential for a continuous HER during long-term operation, implying its excellent stability. The prospective catalytic activity and good stability of the MoP/GR/NF material could prospectively open a new aspect for developing effective electrocatalyst for hydrogen production in water splitting application.