▎ 摘　　要

NOVELTY - Preparation of palladium/nitrogen graphene composite electrode catalyst involves preparing the graphite oxide in ultrasonic dispersing graphite oxide in water dispersion, adding melamine in reaction system, obtaining the powder by freezing and drying in nitrogen atmosphere, preparing nitrogen-doped graphene, adding palladium nitrate solution to system and mixing ultrasonically, adding hydrazine hydrate and stirring the mixture, and separating the solid product by centrifuging, and drying after washing with deionized water. USE - Preparation of palladium/nitrogen graphene composite electrode catalyst used as anode material of direct methanol/formic acid fuel cell. ADVANTAGE - High temperature and high pressure are not required for palladium nanoparticles in-situ deposition. The preparation process is simple and controllable with high reproducibility. The electrode catalyst improves the electrochemical performance of fuel cell. DETAILED DESCRIPTION - Preparation of palladium/nitrogen graphene composite electrode catalyst involves preparing the graphite oxide dispersion liquid by ultrasonically dispersing graphite oxide in water, adding the melamine in reaction system and heating to reflux at 60-100 degrees C, freezing and drying the reaction system, obtaining the powder by freezing and drying in nitrogen atmosphere, heat treating at 500-600 degrees C for 1-2 hours by raising the temperature to 700-900 degrees C for 1-2 hours under heat treatment to prepare nitrogen-doped graphene, ultrasonically dispersing nitrogen-doped graphene in glycol solution, adding palladium nitrate solution to reaction system and mixing ultrasonically, adding hydrazine hydrate, stirring, and separating the solid product by centrifuging, and drying after washing with deionized water.