▎ 摘　　要

NOVELTY - Preparation of graphene/manganese oxide electrode involves (S1) forming mixed solution comprising manganese dioxide nanoneedles and graphene oxide in mass ratio is 1:(0.5-12), (S2) forming mixed solution film, and (S3) flash reducing the film. USE - Preparation of graphene/manganese oxide electrode for super capacitor (all claimed). ADVANTAGE - The method is simple and economical and one-step method flash reduction prepares high-performance graphene/manganese oxide electrode, manufacture porous graphene network with high quality, and synthesize embedded pseudo-capacitance active (MnOx) nano-material. The electrode has ultra-high capacitance (up to 1706F.g-1) beyond the theoretical limit of pure graphene and manganese oxide. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for supercapacitor with high energy density.