Tungsten trioxide is a representative inorganic electrochromic material, which has also become the most researched inorganic electrochromic material. WO3 realized commercialization due to its high coloring efficiency, large light modulation range, good electrochemical reversibility and high chemical stability.

Mo doped WO3 nanowires film can be prepared by nanowire spraying. Experts amplified the preparation technology of this porous electrochromic film under laboratory conditions to prepare an electrochromic device of size of 10×10cm2. Experts also said that such spraying technology is expected to replace the vacuum coating process in the future, reducing the production cost of large-area electrochromic devices.

Nest-like WO3•0.33H2O film can be prepared by self-seeded hydrothermal method on an FTO conductive substrate. So, what are the advantages of using the self-seeded hydrothermal method to prepare tungsten trioxide electrochromic film?

WO3•0.33H2O nanosheet film can be prepared by seed-assisted hydrothermal method on FTO (SnO2: F) conductive glass. Expert found that: