WO3-TiO2 electrochromic device can be a liquid electrochromic device, which is assembled with a WO3 film as an electrochromic layer, a TiO2 film as an ion storage layer, and a LiClO4-PC liquid electrolyte as an electrolyte layer. Also, such an electrochromic device can be an all-solid electrochromic device when the electrolyte layer is PMMA-PC-LiClO4 system gel polymer electrolyte.
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Among them, the WO3 electrochromic film is the core layer of the entire electrochromic device as it is the layer where color change reaction occurs. The tungsten trioxide film has a good spectral transmittance in the bleached state and a color change in the colored state to produce a modulating absorption or reflection in the spectrum. The TiO2 film with a large ion storage capacity stores ions and balances the charge. It is reported that such an electrochromic device is expected to be applied to prepare smart windows.
