▎ 摘　　要

NOVELTY - Preparing porous nitrogen-doped graphene composite cobalt phosphide nanosheets involves mixing cobalt salts, phosphorus-containing organic compounds and nitrogen source compounds to form deep eutectic solvents. The deep eutectic solvents are coated on the electrode substrate and fired to obtain the porous nitrogen-doped graphene composite cobalt phosphide nanosheets. USE - Method for preparing porous nitrogen-doped graphene composite cobalt phosphide nanosheets used as hydrogen evolution catalyst (claimed). ADVANTAGE - The method enables to prepare porous nitrogen-doped graphene composite cobalt phosphide nanosheets, which provide a feasible solution for the preparation of full pH electrocatalytic hydrogen evolution catalyst.