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13 November 2000 Electrochemical and optical properties of WO3:X sol-gel coatings (X=Li, Ti, Nb, Ta)
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Electrochromic behavior of amorphous tungsten oxide (formula available in paper)doped films was investigated. The addition of titanium (5 %mol), noibium (5 %mol), tantalum (5 %mol) and lithium salt (15 %mol) to the precursor solutions leads to films with different electrochemical performance. The electrochormic properties of these films were investigated by in situ spectroelectrochemical method exhibiting a blue coloration under Li+ insertion with a reversible variation of the transmittance in the visible and near infrared range between 10% and 90%. The electrochemical and optical responses of the films were obtained from the cyclic voltammetry measurements using propylene carbonate with 0.1M LiC1O4 as electrolyte. The bleaching process in the lithium doped films occurs in a few seconds and faster response for the bleaching was obtained for WO3:Li:Ti film.
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Cesar O. Avellaneda and Luis O. Bulhoes "Electrochemical and optical properties of WO3:X sol-gel coatings (X=Li, Ti, Nb, Ta)", Proc. SPIE 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites, (13 November 2000);

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