Fabrication and characterization of Sb2O3-MoS2nanocomposites for high performance supercapacitor applications.

ABSTRACT

Binary nanocomposite-based electrodes have been studied extensively in recent times owing to their multiple oxidation states, excellent physico-chemical features, and combined morphology, which are suitable for increasing the electrochemical performance of supercapacitors. The present work deals with Sb2O3-MoS2nanocomposites electrode for supercapacitor applications. The x-ray diffraction (XRD), Raman, scanning electron microscope (SEM), energy dispersive x-ray (EDX), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and x-ray photoelectron spectroscopy (XPS) characterizations have been studied to analyze the phase formation, vibrational modes, morphology, elemental composition and binding energies of the prepared Sb2O3-MoS2nanocomposites electrode material, as well as their electrochemical measurements such as cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) have been analyzed. The developed Sb2O3-MoS2nanocomposites electrode provides a high specific capacitance of 454.3 F g-1at the current density of 1 A g-1. Further, the hybrid supercapacitor device has been constructed which shows 104.04 F g-1of specific capacitance at 2 A g-1and manifests a good energy density of 24.42 Wh kg-1at a power density of 1299.89 W kg-1. Additionally, the hybrid device Sb2O3-MoS2//AC exhibits a good capacitive retention of 90.6% and a coulombic efficiency of 100.45% at 10 A g-1over 8000 cycles.