▎ 摘　　要

NOVELTY - A nickel-iron sulfide-graphene composite material comprises nickel, iron and sulfur in a atomic ratio of 0.75:0.25:2. The iron element is doped into the nickel sulfide crystal lattice in a lattice doping manner. USE - Nickel-iron sulfide-graphene composite material used as oxygen evolution reaction electrocatalyst (claimed). ADVANTAGE - The composite material has excellent catalytic activity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite material, which involves dispersing graphene oxide in a solvent comprising dimethylformamide to obtain graphene oxide dispersion, mixing nickel salt solution, iron salt solution and graphene oxide dispersion to obtain reaction mixture, stirring at 50-90 degrees C for 2-8 hours, cooling, reacting the reaction mixture at 100-180 degrees C for 10-18 hours, separating, washing to obtain a composite precursor, calcining and vulcanizing the composite precursor and sulfur powder in an inert atmosphere at 300-600 degrees C at 3-8 degrees C/minute, and heat-preserving for 0.5-2 hours. The molar ratio of the nickel salt to the iron salt is greater than or equal to 3:1, preferably 5:1.