▎ 摘　　要

NOVELTY - The preparation method of graphene and manganese dioxide nanocomposite material involves reacting hydrophilic graphene with manganese acetate and potassium permanganate in the presence of aniline monomer and ammonium persulfate and then mixing, performing co-precipitation reaction and roasting using muffle furnace. USE - The method is useful for preparation of graphene and manganese dioxide nanocomposite material, which is useful in supercapacitor and battery. ADVANTAGE - The method enables simple and economical preparation of graphene and manganese dioxide nanocomposite material with high specific surface area and excellent hydrophilicity in environmentally-friendly manner.