▎ 摘　　要

NOVELTY - Preparing a nitrogen-doped graphene/metal oxide nanocomposite, comprises: (1) weighing graphene and metal salt having calcium ion as trivalent or tetravalent metal and then adding to a dispersant, and performing ultrasonic dispersion to obtain mixed solution; (2) reacting the mixed solution with ammonia at a gas-liquid interface, cooling and centrifuging the obtained product, and cleaning and drying the precipitate to obtain powder; and (3) feeding ammonia or gas mixture of ammonia and inert gas, keeping the powder, and cooling the powder to room temperature. USE - The method is useful for preparing a nitrogen-doped graphene/metal oxide nanocomposite. ADVANTAGE - The method is capable of simply, rapidly and economically preparing the nitrogen-doped graphene/metal oxide nanocomposite with high electrical conductivity and yield in an environmentally friendly manner. DETAILED DESCRIPTION - Preparing a nitrogen-doped graphene/metal oxide nanocomposite, comprises: (1) weighing graphene and metal salt having calcium ion as trivalent or tetravalent metal and then adding to a dispersant, and performing ultrasonic dispersion to obtain mixed solution; (2) reacting the mixed solution with ammonia at a gas-liquid interface at 60-200 degrees C for 3-12 hours, cooling and centrifuging the obtained product, and cleaning and drying the precipitate to obtain powder; and (3) feeding ammonia or gas mixture of ammonia and inert gas, keeping the powder at 600-900 degrees C for 2-6 hours, and cooling the powder to room temperature to obtain the nitrogen-doped graphene/metal oxide nano-composite.