▎ 摘　　要

NOVELTY - Hybrid nanomaterial comprises Co9S8/Co3S4/copper(II) sulfide nanoparticles which are uniformly distributed on the surface of graphene. The Co9S8/Co3S4/Cu2S nanoparticles are nanoparticles composed of Co9S8, Co3S4 and copper(II) sulfide, and the molar ratio of cobolt and copper in the Co9S8/Co3S4/Cu2S nanoparticles is 6:1-10:1. USE - The nanomaterial is useful as the electrocatalyst in the oxygen evolution reaction. ADVANTAGE - The method is simple in process, high in operation feasibility, strong in repeatability and easy to realize. The obtained Co9S8/Co3S4/Cu2S hybrid nano material has advanced structure, excellent electro-catalytic oxygen evolution performance, is expected to be applied in the electrolytic water system, is green, clean and renewable energy production and application provides power, with wide application prospect in the renewable energy field. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of CoS/CoS/CuS hybrid nano material.