Electrochromism of colloidal tungsten oxide

Acidification of tungstate solutions leads to the formation of tungstic acids that polymerize, through a polycondensation process, giving rise to colloidal tungsten oxide. Reversible display devices can be obtained by electrochemichromism. The colloidal solution is then deposited onto a conductive t...

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Bibliographic Details
Published in:Solid state ionics 1983-01, Vol.9, p.357-361
Main Authors: Chemseddine, A., Morineau, R., Livage, J.
Format: Article
Language:English
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Summary:Acidification of tungstate solutions leads to the formation of tungstic acids that polymerize, through a polycondensation process, giving rise to colloidal tungsten oxide. Reversible display devices can be obtained by electrochemichromism. The colloidal solution is then deposited onto a conductive transparent electrode and placed into an electrochemical cell containing a liquid electrolyte such as LiClO 4 in propylene carbonate. With such a device, an optical densitydo = 0.3 is obtained within 0.3s by applying a negative voltage (-4V). The blue coloration remains after the voltage has been removed. Optical spectroscopy and ESR indicate that the blue layer contains reduced W(V) ions.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(83)90260-6