Electrochromic properties of cobalt oxide thin films prepared by chemical vapor deposition

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1836646· OSTI ID:251064

Maruyama, Toshiro; Arai, Susumu ^[1]

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1. Kyoto Univ. (Japan). Dept. of Chemical Engineering

Electrochromic cobalt oxide thin films were prepared by chemical vapor deposition. The source material was cobalt(II) acetylacetonate. Tricobalto tetraoxide (Co{sub 3}O{sub 4}) thin films were obtained at a substrate temperature 250 C. Oxidation and reduction of the films in a 0.1 M KOH solution resulted in changes in optical absorption. The transmittance of the reduced film was higher and that of the oxidized film was lower than that of the as-deposited Co{sub 3}O{sub 4} films. The infrared reflection-absorption spectra showed that the structural changes were attributable to the Co(III)/Co(II) redox process in a hydrated Co(II)Co(III){sub 2}O{sub 4}. Coulometry indicated that the coloration efficiency was 21.5 cm{sup 2}/C.

• Sponsoring Organization: USDOE
• OSTI ID: 251064
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 143; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL VAPOR DEPOSITION
COBALT OXIDES
ELECTROCHROMISM
INFRARED SPECTRA
POTASSIUM HYDROXIDES
REDOX REACTIONS