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Synthesis of MnO2 Nanowires by Hydrothermal Method and their Electrochemical Characteristics

수열합성법을 이용한 망간 나노와이어 제조 및 이의 전기화학적 특성 연구

  • Hong, Seok Bok (Department of Chemical Engineering, Kangwon National University) ;
  • Kang, On Yu (Department of Chemical Engineering, Kangwon National University) ;
  • Hwang, Sung Yeon (Korea Research Institute of Chemical Technology) ;
  • Heo, Young Min (SKC Advanced Technology R&D Center) ;
  • Kim, Jung Won (Department of Chemical Engineering, Kangwon National University) ;
  • Choi, Bong Gill (Department of Chemical Engineering, Kangwon National University)
  • Received : 2016.11.14
  • Accepted : 2016.11.21
  • Published : 2016.12.10

Abstract

In this work, we developed a synthetic method for preparing one-dimensional $MnO_2$ nanowires through a hydrothermal method using a mixture of $KMnO_4$ and $MnSO_4$ precursors. As-prepared $MnO_2$ nanowires had a high surface area and porous structure, which are beneficial to the fast electron and ion transfer during electrochemical reaction. The microstructure and chemical structure of $MnO_2$ nanowires were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Brunauer-Emmett-Teller measurements. The electrochemical properties of $MnO_2$ nanowire electrodes were also investigated using cyclic voltammetry and galvanostatic charge-discharge with a three-electrode system. $MnO_2$ nanowire electrodes showed a high specific capacitance of 129 F/g, a high rate capability of 61% retention, and an excellent cycle life of 100% during 1000 cycles.

Keywords

supercapacitor;$MnO_2$;nanowire structure;electrochemical performance

Acknowledgement

Supported by : 한국연구재단

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