▎ 摘　　要

NOVELTY - A nanocomposite material comprises uniform sized cobaltosic oxide nanoparticles distributed uniformly on nitrogen-doped graphene surface to form a binary multilevel structure. USE - Nanocomposite material for use in supercapacitor electrode material (claimed). ADVANTAGE - The nanocomposite material utilizes complete active material and improves conductivity, and has uniform size of 80 nm, and enhances amount of nitrogen-doped graphene. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing the nanocomposite material, which involves preparing 4 mg/ml aqueous graphene solution, stirring aqueous graphene solution with ammonia at 80 degrees C, adding cobalt acetate solution to the mixture, reacting the mixture hydrothermally, washing the mixture with deionized water, and drying the mixture under vacuum at 60 degrees C.