Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effects of Heat Treatment and Viologen Incorporation on Electrochromic Properties of TiO2 Nanotubes

열처리 및 바이올로젠 도입에 따른 TiO2 나노튜브의 전기변색 특성

  • Cha, Hyeongcheol (Interdisciplinary Program in Creative Engineering, School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education) ;
  • Nah, Yoon-Chae (Interdisciplinary Program in Creative Engineering, School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
  • 차형철 (한국기술교육대학교 에너지신소재화학공학부, 창의융합공학협동과정) ;
  • 나윤채 (한국기술교육대학교 에너지신소재화학공학부, 창의융합공학협동과정)
  • Received : 2016.04.10
  • Accepted : 2016.04.15
  • Published : 2016.04.28
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Abstract

We demonstrate the electrochromic properties of $TiO_2$ nanotubes prepared by an anodization process and investigate the effects of heat treatment and viologen incorporation on them. The morphology and crystal structure of anodized $TiO_2$ nanotubes are investigated by scanning electron microscopy and X-ray diffraction. As-formed $TiO_2$ nanotubes have straight tubular layers with an amorphous structure. As the annealing temperature increases, the anodized $TiO_2$ nanotubes are converted to the anatase and rutile phases with some cracks on the tube surface and irregular morphology. Electrochemical results reveal that amorphous $TiO_2$ nanotubes annealed at $150^{\circ}C$ have the largest oxidation/reduction current, which leads to the best electrochromic performance during the coloring/bleaching process. Viologen-anchored $TiO_2$ nanotubes show superior electrochromic properties compared to pristine $TiO_2$ nanotubes, which indicates that the incorporation of a viologen can be an effective way to enhance the electrochromic properties of $TiO_2$ nanotubes.

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