▎ 摘　　要

NOVELTY - The method involves immersing a doped porous graphene fiber (1) in metal oxide precursor solution (2). Resistance heat is generated by flowing electricity to the graphene fiber impregnating with the metal oxide. A metal oxide precursor (3) is synthesized into metal oxide nanoparticles (5) by the resistance heat. Amount of electric power applied to the graphene fiber is controlled to generate the resistance heat. A doping element present on the surface and inside of the graphene fiber and a metal cation contained in the metal oxide are chemically bonded by a coordination bond. USE - Method for manufacturing a metal oxide-graphene hybrid fiber used in an electrode for an ultra-capacitor. ADVANTAGE - The method enables ensuring simple and economical process, saving energy and time, and manufacturing the graphene fiber with excellent electrochemical properties, low interfacial resistance and high capacitance. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the metal oxide-graphene hybrid fiber (Drawing includes non-English language text). 1Doped porous graphene fiber 2Metal oxide precursor solution 3Metal oxide precursor 5Metal oxide nanoparticles 6Metal oxide-graphene hybrid fiber