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Proceedings Paper

Transparent storage layers for H+ and Li+ ions prepared by sol-gel technique
Author(s): Bruno Valla; Juan Carlos Lop Tonazzi; Marcelo A. Macedo; L. H. Dall'Antonia; Michel Andre Aegerter; M. A.B. Gomes; Luis O. Bulhoes
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Paper Abstract

Thin layers of mixed oxides CeO2 - TiO2 and CeO2 - ZrO2 with molar ratio 1:1 have been prepared by sol-gel process using the dip-coating technique. The precursor sols consist of a mixture of nitrate ammonium cerium salt [Ce(NH4)2 (NO3)6], zirconium propoxide or tetraisopropyl orthotitanate, and ethanol. The thickness of the multilayer films is typically 300 nm after densification at 450 degree(s)C. Their use as transparent H+ and Li+ ions storage electrode (counter electrode) for electrochromic devices is studied by electrochemical voltammetry, impedance, and optical spectroscopies. They typically have an optical transmission of 80% in the visible range, do not color after ions insertion, and show good electrochemical stability. These layers also have been tested in complete, all solid state cell having the configuration glass/ITO/EC/electrolyte/CeO2 - TiO2/ITO/glass. The electrochromic layer (EC) was either WO3 or polytoluidine. The protonic electrolyte was a cellulose-polyacetate polymer and the lithium electrolyte was PEO-LiN(SO2CF3)2. Their electrochemical, optical, and lifetime performances are reported.

Paper Details

Date Published: 1 December 1991
PDF: 15 pages
Proc. SPIE 1536, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion X, (1 December 1991); doi: 10.1117/12.49213
Show Author Affiliations
Bruno Valla, Univ. of Sao Paulo (Brazil)
Juan Carlos Lop Tonazzi, Univ. of Sao Paulo (Brunei)
Marcelo A. Macedo, Univ. of Sao Paulo (Brazil)
L. H. Dall'Antonia, Univ. of Sao Paulo (Brazil)
Michel Andre Aegerter, Univ. of Sao Paulo (Brazil)
M. A.B. Gomes, Federal Univ. of Sao Carlos (Brazil)
Luis O. Bulhoes, Federal Univ. of Sao Carlos (Brazil)


Published in SPIE Proceedings Vol. 1536:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion X
Carl M. Lampert; Claes G. Granqvist, Editor(s)

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