▎ 摘　　要

Developing low-cost and high-efficiency photocatalysts for hydrogen production from solar water splitting is an intriguing and challenging objective. Co-P-based ternary alloy Co-M-P (M: Cu, Ni) cocatalysts decorated on graphene (GP) were prepared by doping Cu and Ni via an in situ synthesis strategy, and the photocatalytic performances for H-2 generation were systematically studied under visible light irradiation. The structure, morphology, chemical composition, and surface electronic state of the catalysts were studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques. The results indicated that the Co-Cu-P and Co-Ni-P alloys were active co-catalysts for photocatalytic H-2 evolution under visible light irradiation, and the partially oxidized Co species played an important role in enhancing efficient H-2 generation evidenced by XPS and XRD characterizations. For the Co-Cu-P/GP (15%) and Co-Ni-P/GP (15%) catalysts, the H-2 generation rates reached 44.5 and 36.1 mmol h(-1) gCo(-1), respectively. The apparent quantum efficiency (AQE) of Co-Cu-P/GP (15%) and Co-Ni-P/GP (10%) samples reached 23.6 and 14.8% at 430 nm, respectively. Multi-cycle experiments indicated that both Co-Cu-P/GP (15%) and Co-Ni-P/GP (10%) catalysts presented a good stability in photocatalytic H2 evolution reactions. The Co-Ni-P and Co-Cu-P alloy materials are promising catalysts for photocatalytic H-2 evolution.