▎ 摘　　要

NOVELTY - Preparing (M1) nitrogen doped-graphene involves: reacting organic material having at least one amino group and at least one functional group selected from carboxylic acid group, amide group, sulfonic acid group, carbonylchloride group and carbonylbromide group with graphite in reaction medium containing polyphosphoric acid and phosphorus pentoxide-, thus graphite being exfoliated with the functional group of the organic material grafted to the graphite to prepare organic material-grafted graphene; and heat treating the prepared organic material-grafted graphene at 300-1200 degrees C. USE - For preparing nitrogen doped-graphene (claimed) in industry. ADVANTAGE - The method is more inexpensive and simpler method and prepares nitrogen-doped graphene with higher purity and higher yield. The nitrogen-doped graphene prepared by the method has very excellent physical and electric properties, and particularly has superior oxygen reduction capability, compared with the platinum catalyst used at cathode of H2/O2 fuel cell so that it will replace the platinum to lower more the cost of H2/O2 fuel cell or to increase its life and further to provide a new turning point for the commercialization of H2/O2 fuel cell. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a nitrogen-doped graphene prepared by the method (M1).