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Coloration dynamics of tungsten oxide based all solid state electrochromic device

✍ Scribed by Yongming Li; Yoshihiro Aikawa; Akira Kishimoto; Tetsuichi Kudo

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
601 KB
Volume
39
Category
Article
ISSN
0013-4686

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✦ Synopsis

An electrochromic thin lilm of amorphous WO,nH,O was fabricated by spin-coating a peroxo-polytungstate solution. Coloration and bleaching kinetics of the tilm in contact with a solid polymer electrolyte were. investigated by a chrono-amperometric method using a cell, Li/polymer/WO,nH,O, ITO. The transition currents were analyzed on the basis of a newly proposed theory for the diKusion-controlled current generated by a voltage step in such a cell without a reference electrode. It was found that both kinetics were controlled by the diffusion process and the chemical diffusion coefficients of lithium were, in common, about 5 x lo-'* cm2 s-'.

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