Optical and electrochemical properties of sol-gel spin coated CeO{sub 2}-TiO{sub 2} films
Book
·
OSTI ID:197613
- Lawrence Berkeley Lab., CA (United States)
The optical and electrochemical properties of sol-gel spin coated CeO{sub 2}-TiO{sub 2} (50% CeO{sub 2}) films were investigated for electrochromic applications such as smart windows. The coating solutions were prepared by using mixed organic-inorganic [Ti(OC{sub 2}H{sub 5}){sub 4} and Ce(NH{sub 4}){sub 2} (NO{sub 3}){sub 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{sub s}=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=2.18 and extinction coefficient value of k=8{times}10{sup {minus}4} at {lambda}=550 nm. Cyclic voltammetric measurements showed reversible electrochemical insertion of lithium ions in a CeO{sub 2}-TiO{sub 2}/LiClO{sub 4}-propylene carbonate electrochemical cell. During cycling the films maintain high optical transmittance. Spectrophotometric and electrochemical investigations performed on CeO{sub 2}-TiO{sub 2} films revealed that these films are suitable as an optically passive counter-electrode in lithium electrochromic devices.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 197613
- Report Number(s):
- CONF-950793--; ISBN 0-8194-1890-0
- Country of Publication:
- United States
- Language:
- English
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