Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

  • Kim, Hong-Il (Department of Industrial Engineering Chemistry, Chungbuk National University) ;
  • Kim, Han-Joo (Pureechem Co., Ltd.) ;
  • Morita, Masayuki (Department of Applied Chemistry, Graduate School of Science and Engineering, Yamaguchi-University) ;
  • Park, Soo-Gil (Department of Industrial Engineering Chemistry, Chungbuk National University)
  • Published : 2010.02.20
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Abstract

To reduce polarization of electrochemical capacitor based on carbon nanotube, titanium oxide nanoparticles were deposited by ultrasound. The pore distribution of $TiO_2$/CNT nanoparticle exhibited surface area of $341\;m^2g^{-1}$ when $TiO_2$ content was 4 wt %, which was better than that of pristine CNT with surface area of $188\;m^2g^{-1}$. The analyses indicated that titanium oxide (particle diameter < 20 nm) was deposited on the CNT surface. The electrochemical performance was evaluated by using cyclic voltammetry (CV), impedance measurement, and constant-current charge/discharge cycling techniques. The $TiO_2$/CNT composite electrode showed relatively better electrochemical behaviors than CNT electrode by increasing the specific capacitance from $22\;Fg^{-1}$ to $37\;Fg^{-1}$ in 1 M $H_2SO_4$ solution. A symmetric cell assembled with the composite electrodes showed the specific capacitance value of $11\;Fg^{-1}$ at a current loading of $0.5\;mAcm^{-2}$ during initial cycling.

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