Electrochromic materials that are colorless in the high-valent oxidation state and colored in the low-valent reduction state are called cathodic electrochromic materials, mainly including WO3, MoO3 and their mixed materials of the B group, as well as V2O5, Nb2O5, TiO2, BiO3, etc.; The most typical one is tungsten trioxide (WO3), which was first discovered to have electrochromic properties, and is also the most widely and deeply researched electrochromic material. For tungsten trioxide (WO3), the position of tungsten is occupied by WⅥ, which is a transparent film; while in the redox state, WⅤ produces electrochromic effect. Although the detailed discoloration mechanism of WO3 is still controversial, the important role of the implantation and extraction of metal cations has been recognized. It is generally believed that the reaction equation is as follows: xM++xe－ +WO3→MxWO3 where M represents H+, Li+, etc. WO3 is colorless in the high-valence state and blue in the low-valence state. It is a kind of cathodic electrochromic material that is colorless in the high-valence oxidation state and colored in the low-valence reduction state. This type of material is mainly a group VIB metal. oxide.
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