▎ 摘　　要

Searching for active, durable, and economical electrocatalysts for the oxygen evolution reaction (OER) is crucial for developing future sustainable energy technologies. Herein, we present our recent endeavor in the engineering of a high-efficiency OER electrocatalyst based on nanoscale nickel phosphide particles compositing with reduced graphene oxide (rGO/Ni2P), derived from a supported metal-organic complex, through self-assembly, followed by low-temperature phosphidation. The desirable architectural and physicochemical properties, featuring a sandwich-like nanosheet morphology, nanoscale Ni2P subunit building blocks, and conductive substrate incorporation, endow the as-synthesized rGO/Ni2P with abundant active sites, facile mass/charge transfer, and good stability against agglomeration. As a result, the rGO/Ni2P nanocomposite manifests advanced OER performance with low overpotential, fast reaction kinetics, and strong durability. Additionally, detailed structural and compositional analysis further reveals that an overlayer of NiOOH is in situ generated on the surface of Ni2P nanoparticles upon anodic polarization, and the derived rGO/Ni2P/NiOOH performs as an actual catalyst to boost the OER process. This work elucidates that fine control over structural architecture and chemistry of the material promises high-performance electrocatalysis and would inspire to develop efficient noble-metal-free OER electrocatalysts derived from transition-metal phosphides.