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- Title
Facile one-step hydrothermal synthesis of reduced graphene oxide/CoO composites for supercapacitors.
- Authors
Liu, Gui-Jing; Fan, Le-Qing; Yu, Fu-Da; Wu, Ji-Huai; Liu, Lu; Qiu, Zhao-Yuan; Liu, Qin
- Abstract
This paper reports a facile one-step hydrothermal treatment of graphene oxide (GO) and cobalt acetate (Co(Ac)) for preparing reduced GO (rGO)/CoO composites which were used as electrode materials for supercapacitors containing electrolytes of 2 M KOH aqueous solution. The morphologies and structures of rGO/CoO composites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectrum, and N adsorption-desorption isotherms. The electrochemical performances of two-electrode supercapacitors were evaluated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. During the hydrothermal reaction, GO was reduced and 10-30 nm-sized CoO nanoparticles were in situ grown onto the rGO sheets simultaneously. The effects of mass ratios of GO and Co(Ac) on the performances of supercapacitors were investigated. In comparison with pure CoO-based supercapacitor, supercapacitors based on rGO/CoO composites show better performances because both the specific surface areas and the electrical conductivities of electrode materials were increased by the introduction of rGO. When the mass ratio of GO and Co(Ac) is 1:2, rGO/CoO composite electrode exhibits the highest capacitance of 263.0 F/g at a constant current density of 0.2 A/g in a two-electrode supercapacitor. In addition, the supercapacitor shows high rate capability and long cyclic durability.
- Subjects
SUPERCAPACITOR electrodes; GRAPHENE oxide; COBALT acetate; COMPOSITE materials synthesis; ELECTRIC conductivity; ELECTRIC capacity; ELECTRIC properties of cobalt oxides
- Publication
Journal of Materials Science, 2013, Vol 48, Issue 24, p8463
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-013-7663-4