▎ 摘　　要

Herein, Ni/NiO nanoparticles were anchored on phosphorous oxide/graphene for electrocatalytic water splitting. The organophosphate units in graphene nanosheets may facilitate the preferred formation of a surface oxide-modified nickel species with stable reduced electron density at the Fermi level. Efficient catalytic activity and stability in a hydrogen evolution reaction (HER) were obtained. Ni/NiO@HGP(x)O(y) with a low nickel loading shows an overpotential of 205 mV at a current density of 10 mA cm(-2) and a Tafel slope of 80 mV dec(-1), whereas those of its undoped counterpart are 278 mV and 117 mV dec(-1), respectively. We proposed that the small particle size, uniform dispersion of Ni/NiO nanoparticles, and electronic effect arising from the interactions between HGP(x)O(y) and Ni/NiO nanohybrids contribute to the improved electrocatalytic performance.