Self-assembled Co9S8/RGO-CNT interconnected architecture as composite electrode for supercapacitors

Co9S8 nanoparticles are dispersed homogeneously on the backbone of self-assembled RGO-CNT by using hydrothermal and vacuum filtration method. The interconnected structure of Co9S8/RGO-CNT generates a profound impact on the electrode, resulting from the addition of CNTs into RGO/Co9S8, forming a 3D intertwined structure. The composite electrode shows a high specific capacitance of 1376.78 F g(-1), which is much higher than that of graphene or Co9S8 as electrode material, and excellent cycling stability at the scan rate of 5 mV s(-1). In addition, the composite electrode exhibits brilliant long-term stability with the specific capacitance of 894.9 F g(-1) after 500 charge/discharge cycles. The Co9S8/RGOCNT composite with interconnected architecture is a promising electrode candidate for supercapacitors.