▎ 摘　　要

NOVELTY - Composite electrode material is an alpha -ferric oxide (Fe2O3)@ nitrogen-doped graphene composite materia, and is prepare by solvothermal reaction of graphene oxide, iron salt precursor and hexamethylenetetramine as raw materials. The alpha -Fe2O3 crystalline nanoparticles generated on the surface of graphene, in the structure of the composite electrode material, alpha -Fe2O3 nanoparticles are tightly combined on the three-dimensional graphene to form a particle-coated sheet structure. USE - Composite electrode material used in supercapacitor energy storage devices. ADVANTAGE - The composite electrode material has excellent electrochemical performance and especially high specific capacitance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing composite electrode material, which involves preparing a mixed solvent of deionized water and absolute ethanol; adding graphene oxide to the mixed solvent, and placing into an ultrasonic bath for ultrasonic treatment after mixing; dispersing graphene oxide uniformly in the solvent to form a mixed solution; adding the iron salt precursor and hexamethylenetetramine to the mixed solution; stirring to make the mixture uniform; performing a solvothermal reaction, specifically pouring the mixed solution into a hydrothermal kettle, after reaction at 100-200 degrees C, obtaining alpha -Fe2O3@nitrogen-doped graphene composite material; cleaning and drying the alpha -Fe2O3@nitrogen-doped graphene composite material; obtaining alpha -Fe2O3@nitrogen-doped graphene composite electrode material is obtained; (2) an electrode of a super capacitor, which is made of the composite electrode material, and conductive carbon black and polytetrafluoroethylene coated on foamed nickel; and (3) a method for preparing electrodes of supercapacitors, which involves preparing composite electrode material; coating the alpha -Fe2O3@nitrogen-doped graphene composite material, conductive carbon black and polytetrafluoroethylene on the nickel foam to make an electrode and flattening with a tablet press.