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Solid-state asymmetric supercapacitor based on manganese dioxide/reduced-graphene oxide and polypyrrole/reduced-graphene oxide in a gel electrolyte

Authors
Journal
Colloids and Surfaces A Physicochemical and Engineering Aspects
0927-7757
Publisher
Elsevier
Volume
456
Identifiers
DOI: 10.1016/j.colsurfa.2014.05.003
Keywords
  • Asymmetric Supercapacitor
  • Manganese Dioxide
  • Polypyrrole
  • Reduced-Graphene Oxide
  • Capacitive Performance

Abstract

Abstract Manganese dioxide/reduced graphene oxide/indium tin oxide (MRI) and polypyrrole/reduced graphene oxide/indium tin oxide (PRI) electrodes were prepared via the chronopotentiometric-deposition of either manganese oxide or polypyrrole, respectively, onto a RGO/ITO film at a constant current density. Solid-state asymmetric supercapacitors (ASC) were assembled using MRI as the positive electrode and PRI as the negative electrode in a PVA/LiCl gel electrolyte. These devices displayed a power density of 7.4kW/kg (for an energy density of 13Wh/kg), an energy density of 16Wh/kg (for a power density of 0.3kW/kg), and a capacitance retention of 75% over 2000 cycles. The MRI//PRI ASC exhibited a much improved capacitive performance compared to the symmetric PRI//PRI (3Wh/kg at 0.47kW/kg) and MRI//MRI (9Wh/kg at 0.12kW/kg) supercapacitors. The superior capacitive performance of the MRI//PRI ASC was ascribed the improved conductivities and mechanical stabilities of MRI and PRI electrodes, obtained by preparing the polypyrrole and manganese oxide films on a graphene-coated electrode.

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