Tungsten trioxide for preparing a WO3-TiO2 electrochromic film is the first and the most typical cathode electrochromic material. In the decades since the discovery of electrochromism, experts have conducted in-depth research on the preparation of WO3 electrochromic materials and devices.
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Wherein, the methods of preparing WO3 film which has been reported includes a sputtering method, an electrodeposition method, a vacuum evaporation method, an anodization method, a chemical vapor deposition method, and the like. However, these methods have disadvantages such as expensive equipment and complicated technology, so correspondingly, their applications are limited. In this regard, experts say that the WO3 film can also be prepared by the sol-gel method, and the preparation process has the advantages of simple equipment and low cost. Also, sol-gel method is suitable for preparing a large-area film. While the obtained WO3 electrochromic film also has disadvantages such as a low service life, poor film adhesion, and unstable sol, resulting in poor electrochromic performance.
