▎ 摘　　要

NOVELTY - Preparing three-dimensional porous nitrogen-doped graphene comprises (i) mixing of amino acid, transition metal salt and water to obtain mixed solution, (ii) removing water by heating and stirring mixed solution to obtained solid mixture, (iii) roasting and grinding solid mixture obtained in step (ii) to obtain nitrogen-doped carbon powder, (iv) grinding nitrogen-doped carbon powder, pickling, washing using de-ionized water and absolute ethyl alcohol, and drying to obtain three-dimensional porous nitrogen-doped graphene. USE - The graphene is used as fuel cell catalyst or catalyst carrier (claimed), and in fuel battery, lithium ion battery and super capacitor. ADVANTAGE - The method is simple and convenient, economical and suitable for large-scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for three-dimensional porous nitrogen-doped graphene with porous three-dimensional crosslinked network, carbon six-membered ring structure of carbon atoms substituted with pyridine nitrogen, pyrrole nitrogen, graphitized nitrogen and nitric oxide.