▎ 摘　　要

NOVELTY - Preparing porous nitrogen-doped graphene nanosheet network involves mixing nitrogen-containing organic substance with water-soluble salt template, and then placing the mixture into an atmosphere furnace for gradient calcination to obtain black block, where heating is first performed to a temperature of 300-500 degrees C for 0.5-2 hours at a heating rate of 1-10 degrees C/minute, and then heating is continued to a temperature of 600-1500 degrees C for 1-3 hours at a heating rate of 1-10 degrees C/minute. USE - Method for preparing porous nitrogen-doped graphene nanosheet network (claimed). ADVANTAGE - The method enables to prepare porous nitrogen-doped graphene nanosheet network in a simple and cost-effective manner with excellent performance. DETAILED DESCRIPTION - Preparing porous nitrogen-doped graphene nanosheet network involves mixing nitrogen-containing organic substance with water-soluble salt template, and then placing the mixture into an atmosphere furnace for gradient calcination to obtain black block, where heating is first performed to a temperature of 300-500 degrees C for 0.5-2 hours at a heating rate of 1-10 degrees C/minute, and then heating is continued to a temperature of 600-1500 degrees C for 1-3 hours at a heating rate of 1-10 degrees C/minute. The obtained black block is cooled to room temperature. The obtained black block is calcined, crushed, added with 2-5 times of distilled water at 30-100 degrees C for washing after filtration. The obtained residues are dried in thermostat at 60-120 degrees C for 12-24 hours to obtain porous nitrogen-doped graphene nanosheet network. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic transmission electron microscopic image of the prepared porous nitrogen-doped graphene nanosheets network.