Yellow tungsten oxide film, which is the focus of research on inorganic electrochromic materials currently, may be used for producing an electrochromic device for applying in energy-saving building. That is because WO3 film has the advantages of simple preparation process, strong radiation resistance, good chemical stability and strong adhesion to the substrate. Also, it is easy to be made into an all-solid-state device. The tungsten oxide films play an extremely important role in electrochromic devices. Then, what method can be used to prepare a tungsten trioxide electrochromic film?
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Electrophoretic deposition method. Experts said that WO3 electrochromic film prepared by electrochemical deposition has the advantages of simple equipment, low cost, high response speed and large coloring efficiency. Also, there is no need for activation. However, there are also inevitable shortcomings. That is, the obtained film has weak adhesion to the substrate. And it is prone to failure. So, the film is easy to lose its electrochromic properties after it naturally dries in the air. Then, what is electrophoretic deposition? The electrophoretic deposition method is to electrolyze an electrolyte to produce a target film on the surface of the working electrode. In the electrochemical process, ions to be plated are deposited on the substrate of the corresponding electrode by the action of an electric field.
