Redox additive based rGO-Dy2WO6-ZnO nanocomposite for enhanced electrochemical supercapacitor applications

• Published in: Synthetic metals 2021-06, Vol.276, p.116753, Article 116753
• Main Authors: Raja, A., Selvakumar, K., Swaminathan, M., Kang, Misook
• Format: Article
• Language: English
• Subjects: Aqueous electrolytes; Capacitance; Electrode materials; Electrodes; Electrolytes; Electron microscopes; Energy storage; Graphene; Morphology; Nanocomposites; Nanostructure; Photoelectric emission; Redox electrolyte; Reduced graphene oxide; RGO-Dy2WO6-ZnO; Scanning electron microscopy; Supercapacitors; Synergistic effect; Ternary nanocomposite; X ray photoelectron spectroscopy; Zinc oxide
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2021.116753

The specific capacitance of redox additive based electrolytes in supercapacitors is becoming increasingly important. The reduced Graphene Oxide (rGO)-Dy2WO6-ZnO, obtained by a simple hydrothermal route was analyzed by high resolution-transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), scanning electron microscope (SEM), BET analysis, and cyclic voltagram (CV), to understand its structural morphology, chemical constitution and electrochemical efficiency of the nanocomposite. SEM images depict porous nanosheet like the structure of rGO-Dy2WO6-ZnO having a wave-type pattern. This research examines the capacitive performance of rGO-Dy2WO6-ZnO using redox additive electrolyte 0.2 M of K4[Fe(CN)6] in 3 M of KOH. The composite electrode with redox additive based electrolyte gives synergistic effects and enhances the capacitance performance up to 752 Fg−1 at the current density of 1 Ag−1. The energy storage of rGO-Dy2WO6-ZnO electrode material in 0.2 M of K4[Fe(CN)6] in 3 M of KOH is greater than that in the bare aqueous electrolyte of 3 M of KOH. Moreover, the rGO-Dy2WO6-ZnO nanosheet electrode material exhibits excellent cycling stability of 89.6% up to 2000 cycles. [Display omitted] •The reduced graphene oxide-Dy2WO6-ZnO nanocomposite was prepared by hydrothermal method.•The different electrolyte 3 M of KOH and 0.2 M of K4[Fe(CN)6] with 3 M of KOH was used.•The specific capacitance was achieved 752 Fg−1 using 0.2 M of K4[Fe(CN)6] with 3 M of KOH.•The rGO-Dy2WO6-ZnO electrode material that exhibits excellent cycling stability.