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Development of High-performance Supercapacitors Based on MnO2/Functionalized Graphene Nanocomposites

망간산화물/기능화된 그래핀 나노복합체에 기반한 고성능 슈퍼커패시터 개발

  • Choi, Bong Gill (Department of Chemical Engineering, Kangwon National University)
  • 최봉길 (강원대학교 화학공학과)
  • Received : 2016.06.30
  • Accepted : 2016.07.12
  • Published : 2016.08.10

Abstract

In this report, $MnO_2$ 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 $MnO_2$ nanoparticles. As-prepared $MnO_2/RGO$ nanocomposites were characterized using scanning electron microscope, transition electron microscope, X-ray photoelectron spectroscopy, and X-ray diffraction. Electrochemical properties of $MnO_2/RGO$ electrode were evaluated using $Na_2SO_4$ electrolyte under a three-electrode system. The $MnO_2/RGO$ electrode showed a high specific capacitance (251 F/g), a high rate capability (80.5% retention), and long-term stability (93.6% retention).

Acknowledgement

Supported by : 한국연구재단

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