▎ 摘　　要

NOVELTY - Polydopamine is generated on the surface of a nickel foam substrate by using dopamine monomers, to obtain polydopamine-nickel product. Using the obtained product as solid precursor, nickel foam as catalyst, and a template, high-temperature annealing is carried out in a sealed inert gas atmosphere. The temperature is reduced to room temperature to obtain a nitrogen-doped graphene-coated nickel foam. The template is etched using hydrochloric acid to obtain a three-dimensional porous nitrogen-doped graphene material. USE - Preparation of nitrogen-doped graphene material (claimed). ADVANTAGE - The method enables simple and economical preparation of nitrogen-doped graphene material with easy process control, without any special device requirement.