One-step solvothermal synthesis of graphene/Mn3O4 nanocomposites and their electrochemical properties for supercapacitors

► A graphene/Mn3O4 nanocomposite is synthesized by one-step solvothermal method. ► The Mn3O4 nanoparticles are 3-5 nm in size and homogeneously anchor on graphene nanosheets. ► The nanocomposite shows a specific capacitance of 147 F g-1 and a good rate property.