Yellow Tungsten Oxide Powder Applied for New Electrochromic Device

Yellow tungsten oxide powder can be made into an electrochromic film and then be used to produce a new electrochromic device. Experts say that so far, the discoloration mechanism of WO3 film is still not clear, so it is usually explained by one of these models including Deb model, Schirmer model and inter-valence charge transfer model. Among them, the Schirmer model is also called the small polaron model, and the inter-valence charge transfer model is also called the Fanghnan model or the double injection/extraction model.

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Experts also introduced that the dual injection/extraction model and the small polaron model are based on the dual injection and extraction of ions and electrons. Their physical nature is the same. In fact, the dual injection/extraction model can be seen as a semi-classical form of the polarization model. For a long time, these two models have been widely accepted by researchers. However, at the same time, from this, we can also find some contradictions with experimental facts.

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