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

Abstract

(2013). Manganosite-microwave exfoliated graphene oxide composites for asymmetric supercapacitor device applications. Electrochimica Acta, 101 99-108.Manganosite-microwave exfoliated graphene oxide composites for asymmetric supercapacitor device applications AbstractGraphene 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. Keywords exfoliated, applications, microwave, device, graphene, supercapacitor, asymmetric, composites, oxide, manganosite Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsAntiohos, D., Pingmuang, K., Romano, M. S., Beirne, S., Romeo, T., Aitchison, P., Minett, A., Wallace, G., Phanichphant, S. & Chen, J. (2013 AbstractGraphene 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) was used to explore the process occurring at the electrode / electrolyte interface. Long term cyclability and stability was investigated using galvanostatic 2 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/cm 2 (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.

Graphene oxide: A promising nanomaterial for energy and environmental applications

“…This can break some restrictions of TMOs electrode, such as low working voltage, poor stability and unsatisfactory high-rate capabilities [168,169], therefore improving the overall performance of SCs [170][171][172]. For example, GO induced better electrochemical stability (84.1% retention of supercapacitance) in the needle-like MnO 2 /GO composite electrode compared to the pure nano-MnO 2 (69% retention) even with a slightly smaller supercapacitance compensation of 197 F g À ( (211 F g À ( for the pure nano-MnO 2 ) [170].…”

“…Compared to the TMOs, conducting polymers [196] exhibit superior conductivity, higher supercapacitance, lower cost; but the relatively poor cycling performance hinders their practical applications. To overcome this shortcoming, GO/RGO are uniformly dispersed in the conducting polymers, e.g., polyaniline (PANI) [166][167][168][169][170][171][197][198][199][200][201][202][203][204] and polypyrrole (PPy) [172][173][174][175][176][205][206][207][208][209], and thus form stable hybrid composites for SC electrodes. The compositing mechanisms between [190].…”

Chemically converted graphene: scalable chemistries to enable processing and fabrication

“…70 The development of a stacked electrode supercapacitor cell using single-walled nanotubes/ microwave exfoliated GO composites as electrode material has been reported. 71 A composite material consisting of GO exfoliated under microwave radiation and manganosite (MnO) was synthesized to explore their potential as electrode material. 72 LIQUID CRYSTALLINE DISPERSIONS OF GRAPHENE OXIDE Natural graphite is the source of choice for LCGO production.…”

Application of GO in Energy Conversion and Storage

“…However, in practical situations, overall supercapacitor performance varies with the specific composition. For example, the GO/manganese oxide based SCs show great electrochemical performance [174][175][176]. The composite of GO supported by needle-like MnO 2 nanocrystals (see Fig.…”