▎ 摘　　要

NOVELTY - Three-dimensional porous nitrogen-doped graphene composite material preparation involves dissolving iron nitrate and polyvinylpyrrolidone in deionized water under ultrasonic stirring for 3-15 minutes to form a mixed solution. The ferric nitrate and the polyvinylpyrrolidone are provided in a mass ratio of 1.0-3.0:1. The mixed solution is placed in a forced air oven for drying completely, and then ground into a powder, which is transferred to a crucible in a tube furnace at 500-900 degrees C in an inert protective atmosphere for 1-3 hours. The tube furnace is cooled at room temperature to give black foamy product. The obtained black foamy product is collected to give the three-dimensional porous nitrogen-doped graphene composite material. USE - Method for preparing three-dimensional porous nitrogen-doped graphene composite material. ADVANTAGE - The method prepares the three-dimensional porous nitrogen-doped graphene composite material in a simple, precise, cost-effective and eco-friendly manner with strong repeatability, large-scale preparation and broad application prospects in energy storage and catalysis fields. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic X-ray diffraction pattern of the three-dimensional porous nitrogen-doped graphene composite material modified by an iron carbide nanoparticle.