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Electrochromism in Anodically Formed Tungsten Oxide Films

1978; Institute of Physics; Volume: 125; Issue: 8 Linguagem: Inglês

10.1149/1.2131675

1945-7111

Agatino Di Paola, F. Di Quarto, Carmelo Sunseri,

Anodic Oxide Films and Nanostructures

By anodization of tungsten in acid solutions, oxide films were obtained whose composition depended on the working temperature. In particular, the composition of the films was at 25° and 50°C, but at 70°C. Studies of electrochromism in these films seem to show that the electrocoloration occurs with different mechanisms according to the oxide chemical composition. For films the coloration is due to a simultaneous injection of electrons and H+ ions with formation of hydrogen tungsten bronzes . For films the coloration could occur as a result of the injection of electrons and oxygen ion vacancies with formation of blue oxide hydrate.