▎ 摘　　要

NOVELTY - Preparation of graphene film electrode having tubular structure, involves preparing an aqueous solution of graphene oxide having concentration of 8-12 mg/mL by improved Hummers method, mixing aqueous graphene oxide solution with equal volume of aqueous solution of oxalic acid having concentration of 100-200 mg/mL, pouring it into a container of polytetrafluoroethylene, evaporating the solvent at 20-35 degrees C until oxalic acid is saturated in the mixed solution, immediately transferring to -20 degrees C for overnight freezing, drying at room temperature, obtaining graphene oxide film coated with oxalic acid crystallites, and subjecting to low-temperature heating reduction method. USE - Preparation of tubular structure-having graphene film (claimed) for symmetrical or asymmetric supercapacitor electrode material. ADVANTAGE - The method efficiently and economically provides tubular structure-having graphene film electrode by simple method.