▎ 摘　　要

NOVELTY - Preparing biomelanin/graphene nanocomposite material, comprises (i) mixing the biomelanin with N,N-dimethyl acetamide and heating to obtain biomelanin solution; (ii) mixing and heating the biomelanin solution, carboxylated graphene and acidic solution to obtain a first mixture; (iii) subjecting the first mixture to a microwave catalytic reaction to obtain a second mixture; (iv) performing ultrasonic treatment on the second mixture to obtain a third mixture; and (v) centrifuging, washing and drying the third mixture. USE - The biomelanin/graphene nanocomposite material is useful in electricity generation of microbial fuel cells (claimed) and as cathode. ADVANTAGE - The biomelanin/graphene nanocomposite material has high power generation efficiency, and long-term stable operation. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) biomelanin/graphene nanocomposite material, prepared as mentioned above; and (2) use of biomelanin/graphene nanocomposite material in the electricity generation of microbial fuel cells.