▎ 摘　　要

NOVELTY - Preparation of Prussian blue nanocrystalline graphene composite material comprises mixing 0.1-1 mol hydrochloric acid (HCl) and 0.1-1 mol aniline into 50 ml aqueous solution; ultrasonically dispersing graphene oxide in solution obtained in first step to obtain solution-A; mixing 0.001-0.1 mol ferric nitrate, potassium ferricyanide, and HCl into 50 ml aqueous solution to obtain solution-B; slowly adding solution-A to solution-B, and magnetically stirring; standing for 2 hours, filtering, washing and drying. USE - Method for preparing Prussian blue nanocrystalline graphene composite material used for preparing supercapacitor (claimed). ADVANTAGE - The product has good conductivity. The method is simple, and has low manufacturing cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of supercapacitor comprising ultrasonically dispersing 5-20 mg composite material in 1-2 ml N,N-dimethylformamide solution, adding 50 mu L 5% Nafion (RTM: perfluoro-sulfonic acid polymer) solution, dropping 10-20 mu L nanocomposite suspension on surface of glass carbon electrode, and drying under infrared lamp; preparing into supercapacitor electrode, electrochemically testing charge-discharge performance using 0.1 mol/L potassium chloride solution having a pH of 5.