▎ 摘　　要

Efficient bifunctional electrocatalysts for both the cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) are crucial for water splitting in a sustainable energy system. A strategy for fabricating strongly coupled cobalt phosphide (CoP)/graphene (G) architectures composed of CoP nanoparticles and G is described. Benefiting from synergetic effects of a dual support system of CoP for electroactive sites and G to enhance charge transfer, low overpotentials of 120 mV for the HER (0.5 M H2SO4) and 292 mV for the OER (1 M KOH) are required to achieve current densities of 10 mAcm(-2). The as-prepared CoP/G composites, which serve as bifunctional catalysts for both HER and OER in complete water splitting, can generate a current density of 10 mAcm(-2) at 1.626 V. The present strategy provides a novel and efficient method for configuring high-efficiency electrocatalysts for energy-related storage and conversion devices.