Fabrication of poly(p-styrenesulfonate) grafted reduced graphene oxide/polyaniline/MnO2 hybrids with high capacitance performance

Reduced graphene oxide grafted with poly(p-styrenesulfonate) (rGO-g-PSS) was synthesized by i n-situ free radical polymerization . The rGO-g-PSS was used to induce formation of polyaniline (PANI) nanorod array and then assembled with MnO 2 to form rGO-g-PSS@PANI-MnO 2 hybrids. The rGO-g-PSS@PANI-MnO 2 hybrids were applied to modify electrodes and the specific capacitance (SC) of the rGO-g-PSS@PANI-MnO 2 hybrid reached 425 F/g at the scan rate of 20 mV/s, which was much higher than those of rGO-g-PSS (190 F/g), MnO 2 (203 F/g), rGO-g-PSS@PANI (305 F/g) and rGO-MnO 2 (295 F/g). In addition, the rGO-g-PSS@PANI-MnO 2 hybrid also showed good stability. These good electrochemical performances are due to that rGO-g-PSS@PANI-MnO 2 hybrid could make full use of the high SC of PANI and MnO 2 , high specific surface area and conductivity of rGO, and good interfacial properties of PSS linker.