Indium Oxide/Carbon Nanotube/Reduced Graphene Oxide Ternary Nanocomposite with Enhanced Electrochemical Supercapacitance

Abstract

Electrochemical supercapacitance performance of a ternary nanocomposite composed of mesoporous Indium oxide (In₂O₃) nanocube crystals (size ~ 50 nm) embedded in carbon nanotubes (CNT) and reduced graphene oxide (RGO) prepared by hydrothermal method is reported. Glassy carbon electrode modified with the In₂O₃/CNT/RGO nanocomposite material exhibited excellent electrochemical performance with a large specific capacitance of 1273 F g^–1 at 5 mV s^–1 and 948 F g^–1 at 1 A g^–1. The composite electrode showed excellent cyclic stability without any capacity loss after 5000 charge/discharge cycles. Furthermore, ∼75% capacitance retention was observed at high scan rate of 200 mV s^–1. These results indicate that the novel mesoporous In₂O₃ cubes composited with π-electron rich conductive nanocarbons CNT and RGO would be useful as electrode material for advanced supercapacitors.