Co3S4 hollow nanospheres grown on graphene as advanced electrode materials for supercapacitors

A novel nanocomposite of Co3S4 hollow nanospheres grown on reduced graphene oxide (rGO) has been synthesized by a facile two-step method and used as an advanced electrode material for supercapacitors. The intriguing formation and attachment mechanism of these Co3S4 hollow nanospheres on graphene are investigated. More importantly, it is found that the electrochemical performance of the as-prepared nanocomposite could be effectively improved by the chemical interaction between rGO and Co3S4. Specifically, it exhibits a high specific discharge capacitance of 675.9 F g(-1) at 0.5 A g(-1) and 521.7 F g(-1) at 5 A g(-1). These results suggest the great promise of fabricating graphene-supported hybrid materials for high-performance energy applications.