▎ 摘　　要

NOVELTY - Graphene/manganese dioxide based asymmetric coaxial fiber supercapacitor comprises three-layer structure, the inner electrode located at the center is graphene/manganese dioxide hybrid fiber which is wrapped on the outermost layer is pure graphene and the two layers are separated by phosphoric acid/polyvinyl alcohol as an electrolyte. USE - The supercapacitor is useful for in flexible energy storage and wear-resistant devices. ADVANTAGE - The supercapacitor has higher volumetric energy density and better flexibility. The method is simple and has low cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene/manganese dioxide based asymmetric coaxial fiber supercapacitor comprising (a) dissolving the graphite oxide in a solvent and ultrasonically dispersing to obtain a graphite oxide dispersion having a concentration of 10-25 mg/ml, (b) ultrasonically dispersing the manganese chloride in a solvent, then adding potassium permanganate and deionized water to obtain manganese dioxide nanorods, then adding to the graphite oxide dispersion obtained in the step (a) and stirring to obtain spinning liquid, where the ratio of manganese chloride and solvent is 0.1-0.3 g: 20-50 ml, the mass ratio of manganese chloride, potassium permanganate and deionized water is 0.1-0.3:0.07-0.2:2-5, and the mass ratio of manganese dioxide nanorods and graphite oxide is 1:10-1:20, (c) wet spinning the spinning solution obtained in the step (b) to obtain a graphite oxide/manganese dioxide hybrid fiber, which is reduced in a reducing agent solution to obtain a graphene/manganese dioxide hybrid fiber, where the mass fraction of the reducing agent solution is 45-55%, and (d) moistening the graphene/manganese dioxide hybrid fiber obtained in the step (c), then dip coating phosphoric acid/polyvinyl alcohol as an electrolyte, drying, then immersing in the graphite oxide dispersion, drying again and then reducing; and #graphene/manganese dioxide based asymmetric coaxial fiber supercapacitor prepared by the above method.