Nanostructured TiO{sub 2} semiconductor electrodes modified with surface attached viologens: Applications for displays and smart windows
- Ecole Polytechnique Federale de Lausanne (Switzerland). Inst. de Chimie Physique
Viologen derivatives adsorbed on TiO{sub 2} surfaces in nanocrystalline-nanoporous electrodes have been studied with respect to electrochromic phenomena. The transparent nature and the high internal surface area of these electrodes are very beneficial for this purpose. Two different viologens were studied giving rise to blue, green and violet coloration. For one of the viologens the authors showed the possibility to vary the color for the same viologen/TiO{sub 2} electrode from transparent to green or violet depending on the applied potential. Depending on the applied potential different optical densities were obtained. Optical density changes from 0.1 up to 1 and coloration efficiencies above 100 cm{sup 2}C{sup {minus}1} with a maximum value of 440 cm{sup 2}C{sup {minus}1}, were obtained. The switching times for these electrodes for both coloration and bleaching were faster than 1s for a transmittance change larger than 60%, using 0.5M LiClO{sub 4} in acetonitrile as electrolyte. Preliminary stability tests were performed. One electrode has been cycled 654 times without substantial decline in coloration efficiency.
- OSTI ID:
- 197605
- Report Number(s):
- CONF-950793-; ISBN 0-8194-1890-0; TRN: IM9612%%379
- Resource Relation:
- Conference: 40. annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 9-14 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Optical materials technology for energy efficiency and solar energy conversion XIV; Lampert, C.M. [ed.] [Lawrence Berkeley Lab., CA (United States). Energy and Environment Div.]; Deb, S.K. [ed.] [National Renewable Energy Lab., Golden, CO (United States)]; Grandqvist, C.G. [ed.] [Uppsala Univ. (Sweden). Dept. of Technology]; PB: 379 p.; Proceedings/SPIE, Volume 2531
- Country of Publication:
- United States
- Language:
- English
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