In2O3/MoS2/Reduced Graphene Oxide Nanostructure as Composite Electrodes for Supercapacitors

In this study, a novel reduced graphene oxide, indium (III) oxide, and molybdenum disulfide (rGO/In2O3/MoS2) ternary composite for supercapacitor electrode application was developed via green hydrothermal synthesis. The topography, surface morphology, crystalline structure, phase identification and molecular structure of the composites were examined by applying Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX), Transmission Electron Microscopy (TEM), X-ray Diffraction Spectroscopy (XRD), X-Ray Photoelectron Spectroscopy (XPS), and Raman Spectroscopy. SEM and TEM reveal the uniform dispersion of In2O3 nanoparticles on the rGO and MoS2 sheets. EDX, XRD, and XPS analysis confirm the coexistences of rGO, In2O3, and MoS2, and hence the composite formation. The electrochemical performances of rGO/In2O3/MoS2 ternary composite were evaluated by cyclic voltammetry (CV) in two-electrode configuration in 1 M sodium sulfite (Na2SO3) aqueous electrolyte. The electrochemical results show that the rGO/In2O3/MoS2 composite electrodes possess improved specific capacitance of 77 F/g at a scan rate of 25 mV/s, a modest 29% enhancement over pure In2O3 and In2O3/MoS2 binary composite.