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IJC-A Vol.46A(01) [January 2007] >


Title: Influence of amorphicity on properties of Ce-Ti mixed oxide films for electrochromic devices
Authors: Verma, Amita
Shukla, S K
Bakhshi, A K
Agnihotry, S A
Issue Date: Jan-2007
Publisher: CSIR
IPC CodeInt. Cl. ⁸ C01F17/00; C01G23/02; H01M4/88
Abstract: Alcohol based sols of cerium chloride and titanium propoxide mixed in 1:1 and 1:3 mole ratios have yielded mixed oxide films with excellent chemical as well as mechanical stability on densification at 500ºC. The 1:1 films are more transparent due to their highly porous structure. Electrochemical studies have revealed the significant role of TiO₂ in controlling the ion storage capacity of the films, as it induces amorphicity in them. Although both the films are found to be amorphous to X-rays, the 1:1 composition however, is characterized by the presence of CeO₂ nanocrystallites of about 5 nm dimension. XPS studies have shown the presence of both Ce³⁺ and Ce⁴⁺ states in the films. Scanning electron microscopic study has shown the presence of CeO₂ and TiO₂ agglomerates respectively in the 1:1 and 1:3 films. The faster coloration-bleaching kinetics for the primary electrochromic electrode working in combination with Ce/Ti (1:1) electrode indicates the better utility of the latter in electrochromic windows. Appreciable optical modulation of the electrochromic devices comprising both the Ce/Ti compositions of the counter electrodes over the visible spectral region displays their potential as the ion storage layer for the electrochromic windows.
Page(s): 16-23
ISSN: 0376-4710
Source:IJC-A Vol.46A(01) [January 2007]

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