▎ 摘　　要

NOVELTY - Preparing nitrogen-doped graphene hydrogel comprises (1) adding graphite oxide in water to perform ultrasonic dispersion to obtain oxidized graphene water solution, (2) adding organic amine with the solution and then stirring to form the graphene oxide and organic amine compound of intermediate product and (3) performing hydro-thermal reaction on the intermediate product. USE - The method is useful for preparing nitrogen-doped graphene hydrogel, which is useful as an electrode material of a super capacitor (all claimed). ADVANTAGE - The method simply and economically prepares the nitrogen-doped graphene hydrogel with three-dimensional structure and without pollution in a controlled manner. The nitrogen-doped graphene hydrogel improves the current capacity and power density of the electrode material of the super capacitor.