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차형철,나윤채 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
TiO<sub>2</sub> shows an electrochromic properties when they are electrochemically reduced. However, a color contrast is not strong in the moderate voltage range so that they are limited to the practical device application such as smart windows and rear-view mirrors. Furthermore, a response speed of TiO<sub>2</sub> during electrochromic process is required to be highly enhanced for fast switching optical devices. On the other hand, viologen molecules show a strong electrochromic coloration when they are reduced during the electrochemical reaction. Therefore, viologen anchored TiO<sub>2</sub> nanoparticles are often used as an electrode for a fast switching electrochromic display. Instead of nanoparticles, incorporation of nanotube structure can enhance the electron transfer in the redox reaction and induce more favorable electrochromic properties. In this study, we fabricated the viologen modified TiO<sub>2</sub> nanotube layers Modified TiO<sub>2</sub> layers showed stronger electrochromic coloration and faster response speed.
열처리 및 바이올로젠 도입에 따른 TiO<sub>2</sub> 나노튜브의 전기변색 특성
차형철,나윤채,Cha, Hyeongcheol,Nah, Yoon-Chae 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.2
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.
양극산화된 TiO<sub>2</sub> 및 WO<sub>3</sub> 나노구조체로 구성된 광전기변색 소자 제작
이상훈,차형철,나윤채,Lee, Sanghoon,Cha, Hyeongcheol,Nah, Yoon-Chae 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.5
In this study, we demonstrate the photoelectrochromic devices composed of $TiO_2$ and $WO_3$ nanostructures prepared by anodization method. The morphology and the crystal structure of anodized $TiO_2$ nanotubes and $WO_3$ nanoporous layers are investigated by SEM and XRD. To fabricate a transparent photoelectrode on FTO substrate, a $TiO_2$ nanotube membrane, which has been detached from Ti substrate, is transferred to FTO substrate and annealed at $450^{\circ}C$ for 1 hr. The photoelectrode of $TiO_2$ nanotube and the counter electrode of $WO_3$ nanoporous layer are assembled and the inner space is filled with a liquid electrolyte containing 0.5 M LiI and 5 mM $I_2$ as a redox mediator. The properties of the photoelectrochromic devices is investigated and Pt-$WO_3$ electrode system shows better electrochromic performance compared to $WO_3$ electrode.