Optical and electrochemical properties of sol-gel spin-coated CeO2-TiO2 films

Nilgun Ozer; Selmar De Souza; Carl M. Lampert

doi:10.1117/12.217327

23 August 1995 Optical and electrochemical properties of sol-gel spin-coated CeO₂-TiO₂ films

Nilgun Ozer, Selmar De Souza, Carl M. Lampert

Proceedings Volume 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV; (1995) https://doi.org/10.1117/12.217327
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The optical and electrochemical properties of sol-gel spin coated CeO₂-TiO₂ (50% CeO₂) films were investigated for electrochromic applications. The coating solutions were prepared by using mixed organic-inorganic [Ti(OC₂H₅)₄ and Ce(NH₄)₂ (NO₃)₆] precursors. X-ray diffraction studies showed the sol-gel spin- coated films were composed of an amorphous matrix of titanium oxide containing nanocrystallites of cerium oxide. The coating solar transmission value was T_s equals 0.8 (250 nm thick). The refractive index and the extinction coefficient were derived from transmittance measurements in the UV-VIS-NIR regions. These films had refractive index value of n equals 2.18 and extinction coefficient value of k equals 8 X 10^-4 at (lambda) equals 550 nm. Cyclic voltametric measurements showed reversible electrochemical insertion of lithium ions in a CeO₂-TiO₂/LiClO₄-propylene carbonate electrochemical cell. During cycling the films maintain high optical transmittance. Spectrophotometric and electrochemical investigations performed on CeO₂-TiO₂ films revealed that these films are suitable as an optically passive counter-electrode in lithium electrochromic devices.

Citation Download Citation

Nilgun Ozer, Selmar De Souza, and Carl M. Lampert "Optical and electrochemical properties of sol-gel spin-coated CeO₂-TiO₂ films", Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); https://doi.org/10.1117/12.217327

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