Characterization of an All Solid-State Electrochromic Window,
SAO PAULO UNIV (BRAZIL)
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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 TiOPri4 and CeNO36 NH42 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 -2s at 2S9C. Characterizations of an all solid state electrochromic windowglassITO WO 3 POE-Li N SO 2 CF32 TiO2 - CeO2 ITO glass are also presented.