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http://dx.doi.org/10.4313/JKEM.2018.31.2.102

Electrical Properties of Supercapacitor Based on Dispersion Controlled Graphene Oxide According to the Change of Solution State by Washing Process  

Sul, Ji-Hwan (ICT Materials & Components Research Laboratory, Electronics and Telecommunications Research Institute)
You, In-kyu (ICT Materials & Components Research Laboratory, Electronics and Telecommunications Research Institute)
Kang, Seok Hun (ICT Materials & Components Research Laboratory, Electronics and Telecommunications Research Institute)
Kim, Bit-Na (ICT Materials & Components Research Laboratory, Electronics and Telecommunications Research Institute)
Kim, In Gyoo (ICT Materials & Components Research Laboratory, Electronics and Telecommunications Research Institute)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.31, no.2, 2018 , pp. 102-106 More about this Journal
Abstract
Recently, there has been an increasing interest in the use of graphene as electrode materials for supercapacitors. In this regard, graphene oxide (GO) films were prepared using GO slurry obtained by dispersing GO powder in deionized (DI) water. The degree of dispersion of GO powder in DI water depends on the concentration of GO slurry, pH, impurity content, GO particle size, types of functional groups contained in GO, and manufacturing method of GO powder. In this study, the dispersivity of the GO powder was improved by adjusting the pH using only DI water (without additives), and a uniform GO film was obtained. The GO film was reduced by exposure to xenon intense pulsed light for a few milliseconds, and the reduced GO film was used as electrodes of a supercapacitor. The supercapacitor was characterized using cyclic voltammetry (CV), charge-discharge cycle, and electrochemical impedance spectroscopy measurements, and the specific capacitance of the supercapacitor was found to be ~140 F/g from the CV data.
Keywords
Supercapacitor; Graphene oxide; Washing; Dispersion; Photo reduction;
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