WO3 can be applied in electrochromic device. And it is mainly used as an inorganic electrochromic material or a cathode electrochromic material. According to experts, electrochromic devices have many of the same qualities as batteries so that they can be considered as thin film batteries that can be charged and discharged.
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Experts also said that the tungsten trioxide cathode electrochromic material is the core material for the preparation of solid-state all-inorganic electrochromic devices. The electrochromic device has the characteristics of large discoloration range and good reversibility of cyclic discoloration. Also, it can be used prepared by a reactive magnetron sputtering coating method, which is suitable for large-area production. However, both durability and cycle life of tungsten trioxide need to be improved. Considering that the electrochromic device used as a building smart window needs to have the same life as the building, improving WO3 cycle life and durability is one of the core research issues in the large-scale manufacturing and application of electrochromic devices under the premise of ensuring the core performance such as discoloration amplitude and discoloration rate.
