Development of high-performance supercapacitors based on MnO2/functionalized graphene nanocomposites

초록

In this report, MnO<inf>2</inf> nanoparticle-deposited functionalized graphene sheets were prepared and their superior electrochemical performances were demonstrated by cyclic voltammetry, galvanostatic charge-discharge, and impedance analysis. Ionic liquids were employed to functionalize the surface of reduced graphene oxides (RGOs), leading to prevention of the aggregation of RGO sheets and abundant growth sites for deposition of MnO<inf>2</inf> nanoparticles. As-prepared MnO<inf>2</inf>/RGO nanocomposites were characterized using scanning electron microscope, transition electron microscope, X-ray photoelectron spectroscopy, and X-ray diffraction. Electrochemical properties of MnO<inf>2</inf>/RGO electrode were evaluated using Na<inf>2</inf>SO<inf>4</inf> electrolyte under a three-elec-trode system. The MnO<inf>2</inf>/RGO electrode showed a high specific capacitance (251 F/g), a high rate capability (80.5% retention), and long-term stability (93.6% retention). © 2016 The Korean Society of Industrial and Engineering Chemistry. All rights reserved.

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