Manganosite-microwave exfoliated graphene oxide composites for asymmetric supercapacitor device applications

Dennis Antiohos, Kanlaya Pingmuang, Mark S. Romano, Stephen Beirne, Tony Romeo, Phil Aitchison, Andrew Minett, Gordon Wallace, Sukon Phanichphant, Jun Chen

Research output: Contribution to journalArticleResearchpeer-review

70 Citations (Scopus)

Abstract

Graphene based materials coupled with transition metal oxides are promising electrode materials in asymmetric supercapacitors owing to their unique properties which include high surface area, good chemical stability, electrical conductivity, abundance, and lower cost profile over time. In this paper a composite material consisting of graphene oxide exfoliated with microwave radiation (mw rGO), and manganosite (MnO) is synthesised in order to explore their potential as an electrode material. The composite material was characterised by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to explore the process occurring at the electrode/electrolyte interface. Long term cyclability and stability were investigated using galvanostatic charge/discharge testing. From the resulting analysis, an asymmetric supercapacitor was constructed with the best composite containing 90% MnO-10% mw rGO (w/w). The device exhibited a capacitance of 0.11 F/cm2 (51.5 F/g by mass) and excellent capacity retention of 82% after 15,000 cycles at a current density of 0.5 A/g.

Original languageEnglish
Pages (from-to)99-108
Number of pages10
JournalElectrochimica Acta
Volume101
DOIs
Publication statusPublished - 1 Jan 2013
Externally publishedYes

Keywords

  • Asymmetric supercapacitor
  • Manganosite
  • Microwave exfoliated graphene oxide

Cite this