Violet Tungsten Oxide Applied for Cathode Electrochromic Material

Violet tungsten oxide can serve as a cathode electrochromic material - one of electrochromic materials. The other type is an anode electrochromic material. When the electrochromic material is at the cathode and is colored, it is called cathodic coloring, and its electrochemical reaction formula is:

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Moy + xA+ + xe- ⇌ AxMOy (0≤x≤1)

Where, MOy is a metal oxide (colorless), the metal has a higher oxidation state; A+ is an injected small positive ion such as H+, Li+, Na+, K+, Ag+, etc.; The oxidation state of M in the product AxMOy (colored) becomes low. Such materials are WO3, MoO3, V2O5, Nb2O5, TiO2 and the like. Wherein, tungsten trioxide is more and more popular with people, including scholars, researchers and suppliers.

When the electrochromic material is at the anode and is colored, it is anodically colored, and the reaction is:

Moy - xA+ - xe- ⇌ AxMOy(0≤x≤1)

Such materials are IrO2, NiOx, PrOx and the like.

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