Yellow Tungsten Oxide Applied for Inorganic Electrochromic Film

Yellow tungsten oxide is the most commonly used material for the preparation of an inorganic electrochromic film. And the obtained film can be used for producing an all-solid electrochromic glass, that is, the so-called smart glass, which is more and more widely applied in smart buildings to play the role of heat insulation in summer and heat preservation in winter. So, how to prepare WO3 electrochromic film?

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Specifically, the tungsten powder of a particle size of 200 mesh and a purity of higher than 99.8%, and H2O2 of a concentration of 30% are slowly dropped into a three-necked flask containing tungsten powder according to a ratio of tungsten powder 9g:H2O2 125mL. Stir vigorously for more than 7h under water bath conditions. After the reaction was sufficient, the residue was filtered off, and then an equal volume of absolute ethanol was poured into the solution for atmospheric distillation. The transparent yellow solution obtained by distillation was divided into three equal portions of 100mL. To thicken the solution, one portion was added with 3mL of polyethylene glycol-400, and one portion was added with 3mL of propylene carbonate. The three solutions were sealed and stirred vigorously for 4h, after which was aged for more than 3d. The film was pulled in these three solutions with conductive glass. To maintain a high light transmittance, the film was pulled only once on the conductive glass. The film was heat treated at 320°C for 1h to obtain a transparent doped WO3 electrochromic film.

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