T. Maruyama, S. Arai
Apr 1, 1996
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Journal
Journal of The Electrochemical Society
Abstract
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.