Graphene/metal oxide composite electrode materials for energy storage

► Advance in graphene/metal oxide composites for energy storage is reviewed. ► The importance of synergistic effects of graphene and metal oxides is highlighted. ► The beneficial roles of graphene in the composites is highlighted. ► Six basic structures of graphene/metal oxide composites are summarized. ► The future of graphene/metal oxide composites for energy storage is predicted.