▎ 摘　　要

NOVELTY - Preparing cobalt/nitrogen-doped graphene and nano-carbon fiber composite material comprises e.g. repeatedly washing bacterial cellulose film with deionized water, completely immersing bacterial cellulose film in urea solution, placing in refrigerator completely frozen into solid, freezing and drying sample, obtaining white gas gel of bacterial cellulose and white flocculent urea, placing obtained white gas gel in tubular furnace, heating, naturally cooling, obtaining black carbon aerogel, obtaining matrix composite material nitrogen-doped graphene and nano-carbon fiber composite material, ultrasonically dispersing prepared nitrogen-doped graphene and nano-carbon fiber composite material in deionized water. USE - The method is useful for preparing cobalt/nitrogen-doped graphene and nano carbon fiber composite material for hydrogen precipitation reaction. ADVANTAGE - The method enables preparation of cobalt/nitrogen-doped graphene and nano carbon fiber composite material having excellent electrocatalytic effect with respect to hydrogen precipitation reaction.