Novel NiCo2S4@reduced graphene oxide@carbon nanotube nanocomposites for high performance supercapacitors

Abstract

We present a simple one-step solvothermal method for in situ growth of nickel cobalt sulfide (NiCo₂S₄) nanoparticles on the reduced graphene oxide (rGO) sheets and carbon nanotube (CNT) without adding any surfactant. The NiCo₂S₄@rGO@CNT structure was fabricated successfully with the hydrothermal method. When serving as an electrochemical supercapacitor electrode material, the NiCo₂S₄@rGO@CNT delivers a highly improved specific capacitance of 1242.51 F g⁻¹ at the current density of 2.0 A g⁻¹, as compared with that of pure NiCo₂S₄ (519.51 F g⁻¹) counterpart. Its durability is mainly owing to the synergistic effects of NiCo₂S₄, rGO and CNT, further presenting potential applications in energy storage.