Graphene oxide with improved electrical conductivity for supercapacitor electrodes

► Few-layer graphene oxide (FLG) has been synthesized with a high electrical conductivity. ► The specific capacitance of 180 F g−1 is obtained for the FLG in a 1 M Na2SO4 aqueous. ► The FLG sheets have a great potential as high-performance electrochemical supercapacitors.