In situ growth of NiCo2S4 nanosheets on graphene for high-performance supercapacitorsElectronic supplementary information (ESI) available: XPS of the NiCo2S4-RGO hybrid, XRD patterns of NiCo2S4 HSs, XRD patterns and the SEM image of products in the absence of En, Raman spectra and the SEM image of GO, CV curves of the NiCo2S4-RGO hybrid and nickel foam electrodes and EIS data of the NiCo2S4-RGO hybrid and bare NiCo2S4 electrodes. See DOI: 10.1039/c3cc46034g

We demonstrate a facile hydrothermal method for growth of ultrathin NiCo 2 S 4 nanosheets on reduced graphene oxide (RGO), which exhibit remarkable electrochemical performance with higher capacitance and longer cycle life than the bare NiCo 2 S 4 hollow spheres (HSs). Ultrathin NiCo 2 S 4 nanosheets were grown on RGO sheets, which exhibited remarkable electrochemical performance with higher capacitance and longer cycle life than the bare NiCo 2 S 4 hollow spheres.