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Title: Manganosite-microwave exfoliated graphene oxide composites for asymmetric supercapacitor device applications
Authors: Dennis Antiohos
Kanlaya Pingmuang
Mark S. Romano
Stephen Beirne
Tony Romeo
Phil Aitchison
Andrew Minett
Gordon Wallace
Sukon Phanichphant
Jun Chen
Keywords: Chemical Engineering
Issue Date: 1-Jan-2013
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. © 2012 Elsevier Ltd.
ISSN: 00134686
Appears in Collections:CMUL: Journal Articles

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