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

Abstract

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/RGO-CNT composite with interconnected architecture is a promising electrode candidate for supercapacitors.