WO3 nanorod array film is an important electrochromic material. Some experts have prepared such an electrochromic film by replacing the conventional WO3 seed layer with a TiO2 seed layer that is matched with the FTO lattice. The prepared tungsten trioxide electrochromic film has a large light modulation range, high coloring efficiency, and significantly improved cycle stability.

WO3 electrochromic nano film, mainly hydrated tungsten trioxide nano-disc electrochromic film, can be prepared by hydrothermal method on the FTO conductive substrate. Some experts have discussed various influencing factors of the WO3 electrochromic film during the preparation process.

The electrochromic phenomenon of the tungsten trioxide hydrate nano film can be measured in a three-electrode system. The WO3 film is a working electrode, the platinum wire with a diameter of 0.5mm is a counter electrode, the Ag/AgCl (3mol/L KCl) is a reference electrode, and the electrolyte is a 1mol/L lithium perchlorate/propylene carbonate solution.

If you know electrochromism, and you may know WO3∙0.33H2O film - an extremely important electrochromic film. Such film can be produced by a seed-assisted method using urea as a structure directing agent. The high-resolution transmission electron micrograph of the prepared hydrated WO3 nanodisk shows that it has clear lattice fringes, which proves that it has good crystallinity. The interplanar spacing is 0.367nm, which is the same as the the interplanar spacing of the orthogonal phase WO3∙0.33H2O (002).