Accession Number : ADP006442

Title :   Characterization of an All Solid-State Electrochromic Window,

Corporate Author : SAO PAULO UNIV (BRAZIL)

Personal Author(s) : Tonazzi, Juan C. ; Valla, Bruno ; Macedo, Marcelo A. ; Baudry, Paul ; Aegerter, Michel A.

Report Date : MAR 1992

Pagination or Media Count : 16

Abstract : Sol-gel cerium - titanium oxide layers present potential application as transparent counter-electrode (ion storage layer) in electrochromic windows and mirrors using lithium conducting electrolyte and WO3 electrochromic coating. The precursor sol, prepared by mixing Ti(OPri)4 and Ce(NO3)6 (NH4)2 in ethanol, is initially dark red and becomes transparent after a few days aging indicating the presence of Ce3+ complexes. The layers have been obtained by dip coating technique and heat treated at 4509C during 15 minutes. They have been characterized by XRD, SIMS, optical absorption and electrochemical techniques; it is shown that the electrochemical reaction corresponds to a reversible insertion-extraction of lithium ions within a Ti02 amorphous film containing small CeO2 crystallites. At low sweep frequencies the process is controlled by a diffusion mechanism 6.4 10-12 cm -2/s at 2S9C). Characterizations of an all solid state electrochromic window/glass/ITO/ WO 3 / POE-Li N (SO 2 CF3)2 / 'TiO2 - CeO2 / ITO / glass / are also presented.

Descriptors :   *DIP COATING, *ELECTROLYTES, *OPTICS, ABSORPTION, CERIUM, COATINGS, COUNTERS, DIFFUSION, ETHANOLS, EXTRACTION, FILMS, GELS, GLASS, HEAT, IONS, LAYERS, LITHIUM, MIRRORS, MIXING, OXIDES, PRECURSORS, REVERSIBLE, SOLIDS, STORAGE, TITANIUM, TITANIUM OXIDES, WINDOWS.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE