WO3 is an important electrochromic material. As you may have known, electrochromic materials include transition metal oxides, Prussian blue, organic compounds and high molecular polymers, among which WO3 is a transition metal oxide. Certainly, MoO3 and NiOx are also belonging to transition metal oxides. And they are electrochromic materials as well. However, despite there are many inorganic electrochromic materials, tungsten trioxide is the most widely studied and used inorganic electrochromic material.
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According to experts, the driving force of electrochromic materials is 1-5V DC power supply. The representative materials are WO3, NiOx, Prussian blue and polyaniline. The effective spectrum of transmittance change includes visible light and infrared light. Taking tungsten trioxide electrochromic thin film as an example. A liquid electrochromic device assembled by using WO3 film as an electrochromic layer, TiO2 film as an ion storage layer, and LiClO4-PC liquid electrolyte has a visible light transmittance ranging from 35% to 50%.
