Electrochromic properties of spin-coated thin films from peroxo-polymolybdovanadate solutions
- Univ. of Tokyo (Japan). Inst. of Industrial Science
A now mixed metal peroxo-polyacid based on Mo and V is formed by the direct reaction of a mixture of metallic Mo and V with hydrogen peroxide solution. A homogeneous amorphous thin film about 0.4 {mu}m is fabricated on an indium tin oxide (ITO) glass substrate by a spin-coating technique using this peroxo-polymolybdovanadate solution. After heat-treatment from 80 to 120 C in air for 1 h, it shows reversible electrochromism in an organic LiClO{sub 4} electrolyte solution, and changes color from greenish yellow to grayish violet and violet, depending on the intercalation level of Li. Cyclic-voltammograms of the mixed Mo/V oxide film and those of the end members (MoO{sub 3} and V{sub 2}O{sub 5}) are quite different from one another, both in shape and peak-current potential, indicating that each film has distinctly different intercalation electrochemistry. The potential (E) vs. composition (x, Li content per mol Mo{sub 0.5}V{sub 0.5}O{sub 2.75}) diagram of the present film recorded in the intercalation process agrees with that of the deintercalation process in the range 0 < x < 1.5. The E-x relationship is approximated by two straight lines with different slopes, with a kink at x = 0.5. This suggests that in this film there are two kinds of sites with different site energies. The changes in electrochromic properties with heat-treatment are also discussed in relation to the microstructure of the film.
- OSTI ID:
- 64800
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 142; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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