WO3 electrochromic film may be used to produce a smart window, in which the tungsten trioxide film is prepared from WO3 nanopowder. Specifically, experts say that the WO3 film can be combined with a counter electrode material such as a V2O5 film to form a smart window with better optical properties, and the reaction formula is:
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LixWO3 + V2O5 ? WO3 + LixV2O5
Wherein, LixWO3 and V2O5 have absorption properties in the red light and blue light, respectively, while WO3 and LixWO3 are transparent. Experts also introduced that V2O5 film is a counter electrode material that is a weak cathode electrochromic material with good reversibility of Li ion injection/extraction, and is chemically stable in the polymer electrolyte ion conductor with a large charge storage density (0.5c/cm2). The absorption peak of the V2O5 film is located in the blue region, and its absorption moves in the short-wave direction as the Li ion is injected. When x in LixV2O5 increases from 0 to 0.86, the absorption edge increases from 2.3eV to 2.62eV.
