▎ 摘　　要

NOVELTY - A nickel-iron phosphide/graphene/nickel composite material comprises graphene-wrapped nickel material as carrier, and nickel-iron phosphide array supported on the carrier. The graphene-wrapped nickel material comprises nickel and graphene material wrapped on the nickel surface. The graphene material has vertical scale array structure. The nickel-iron phosphide has a porous array structure. The loading amount of the nickel-iron phosphide array in the nickel-iron phosphide/graphene/nickel composite material is 0.3-0.5 mg. The loading amount of the graphene material in the nickel-iron phosphide/graphene/nickel composite material is 0.2-0.5 mg. USE - Nickel-iron phosphide/graphene/nickel composite material used in electrocatalytic oxygen evolution material for electrochemical oxygen evolution reaction as electrochemical catalyst (all claimed). ADVANTAGE - The nickel-iron phosphide/graphene/nickel composite material does not need any binder during preparation process. The nickel-iron phosphide/graphene/nickel composite material has high conductivity, high repeatability, and excellent stability under alkaline and saline-alkali conditions. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the nickel-iron phosphide/graphene/nickel composite material, which involves performing hydrothermal reaction of nickel and graphene oxide to obtain graphene-wrapped nickel material, using chemical bath deposition to react mixed system containing nickel salt, ferric salt, organic ligand and the graphene-wrapped nickel material, growing a nickel-iron metal organic framework structure on the surface of the graphene-wrapped nickel material to obtain a sandwich structure of nickel-iron metal organic framework/graphene/nickel composite material, calcining the nickel-iron metal organic framework structure/graphene/nickel composite material to obtain a nickel-iron oxide/graphene/nickel composite material, and subjecting the obtained nickel-iron oxide/graphene/nickel composite material to phosphating reduction in a phosphating atmosphere; and (2) use of the nickel-iron phosphide/graphene/nickel composite material in electrochemical oxygen evolution reaction as electrochemical catalyst. An electrolyte used in the electrochemical oxygen evolution reaction comprises 0.1-3.0 mol/L potassium hydroxide solution, 0.1-3.0 mol/L potassium hydroxide solution, 0.1-3.0 mol/L potassium hydroxide, 0.1-3.0 mol/L potassium hydroxide solution and 1-3.0 mol/L sodium chloride.