▎ 摘　　要

NOVELTY - The preparation method of three-dimensional porous graphene/transitional metal oxide composite material involves ultrasonically dispersing graphite oxide in water, then adding transition metal salt and sodium bicarbonate, stirring and dissolving to obtain mixed solution, transferring the mixed solution to hydrothermal reaction kettle and carrying out hydrothermal reaction, drying and calcining under the protection atmosphere. USE - The method is useful for preparing three-dimensional porous graphene/transitional metal oxide composite material, which is useful as electrode material for supercapacitor and cathode material for lithium ion battery. ADVANTAGE - The method enables simple and economical preparation of three-dimensional porous graphene/transitional metal oxide composite material with excellent electrochemical performance in an environmentally-friendly manner, and is suitable for industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for three-dimensional porous graphene/transitional metal oxide composite material prepared by the method.