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

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...

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Bibliographic Details
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
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Summary: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.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2021.116753