▎ 摘　　要

NOVELTY - Preparation of graphene nanofiber involves preparing graphene nanofiber precursor fiber by processing carbon-containing polymer using electrostatic spinning method, performing stabilizing process of graphene nanofiber precursor fiber at appropriate temperature and under atmosphere, and performing carbonization thermal process of obtained fiber at appropriate temperature under reaction atmosphere. USE - Preparation of graphene nanofiber (claimed). ADVANTAGE - The graphene nanofiber has high surface activity. The supercapacitor containing the graphene nanofiber has working voltage of 1.8-2.2 volts, energy density of 41.3 watt hour/kilogram and specific capacitance in acid of 300 F/g. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) graphene nanofiber; (2) supercapacitor; and (3) assembling method of supercapacitor.