▎ 摘　　要

NOVELTY - Preparation of cobalt oxide-nitrogen-doped graphene composite electrode involves ultrasonically dispersing nitrogen-doped graphene, polyacrylamide and cobalt sulfate heptahydrate in deionized water, dripping soluble alkali, adjusting pH of resultant mixture to 8.5-10, adding resultant mixture to reactor, heating, filtering, washing and drying. USE - Preparation of cobalt oxide-nitrogen-doped graphene composite electrode (claimed). ADVANTAGE - The method enables preparation of cobalt oxide-nitrogen-doped graphene composite electrode having excellent stability, by simple, economical and environmentally-friendly process, under mild reaction conditions.