Cabbage-Like NiCo2O4/rGO Nanocomposites: Boosting Capacitance and Power Density for Next-Generation Supercapacitors

Abstract

In the present work, NiCo₂O₄ and NiCo₂O₄/rGO nanocomposites were synthesized by using hydrothermal method. Thermogravimetric analysis (TGA) reveals that NiCo₂O₄/rGO was more stable as compared to NiCo₂O₄. Electrochemical studies reveal that the NiCo₂O₄/rGO exhibits high specific capacitance of 1960 F/g in comparison with NiCo₂O₄ of 870 F/g. NiCo₂O₄/rGO has energy density of 300 W h/kg at low power density and ultra high power density of 18.74 kW/kg at low energy density. Incorporation of reduced graphene oxide increases the specific capacitance, energy density and power density of the electrode material. The SEM micrographs reveal the formation of cabbage-like structure of the nanocomposite. These results of NiCo₂O₄/rGO have drawn increasing attention as the latter is a promising electrode material for high performance supercapacitors.