Tungsten Oxide Powder Applied for New Electrochromic Device

Tungsten oxide powder can be first prepared into a film and then used to prepare a new electrochromic device. Wherein, the tungsten oxide film can be an amorphous tungsten oxide film and a crystalline tungsten oxide film. Some experts believed that the tungsten oxide film with a crystalline structure has a better discoloration effect as it is more advantageous to transport ions at the edge of the grain relaxation.

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While it is generally believed that the porous amorphous tungsten oxide film is more likely to have the injection Li+, Na+ and other similar cations than the crystalline tungsten oxide film. The amorphous film obtained at a lower heat treatment temperature has very small particles, which is very likely forming a cluster structure of hexagonal atoms. This structure has a certain deviation from the standard stoichiometry, which is easy to cause ion injection. And there is a similar octahedral structure, and the gaps between the clusters of these structures form channels for the rapid transport of injected ions.

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