WO3 has good electrochromic property, that is, good heat insulation performance, so it is often used for the preparation of ITO/PET flexible electrochromic electrode, mainly by electrodeposition method. Since electrodeposition technology can be performed on any conductive substrate, experts have used the same electrodeposition technique to deposit hydrated tungsten trioxide nanosheets onto a copper foil, an aluminum foil, and an ITO/PET. The photograph of the flexible WO3·2H2O electrode prepared by electrodeposition method is shown as below.

Hydrated tungsten trioxide can be applied to smart window with good heat insulating property. So, smart glass using nano particle size tungsten trioxide as cathode electrochromic material has a very wide application prospect in the field of smart home, which can be seen from the photos in the figure below.

Hydrated tungsten trioxide nanosheet film is an ideal electrochromic electrode, which can be prepared by seed-assisted hydrothermal method. And the prepared electrochromic film has the advantages of large light modulation range, high coloring efficiency, short electrochromic response time and good cycle stability, which means that such film has good heat insulation performance.

Porous tungsten trioxide electrochromic film can be prepared on the surface of ITO conductive glass by electrophoretic deposition method. And the obtained heat insulating film is a porous WO3 film crossing with nanorods.

Polycrystalline WO3 film can be prepared by electrophoretic deposition method. And the obtained thin film exhibited better cycle stability.

Nest-like WO3•0.33H2O film can be prepared on a FTO conductive glass substrate by self-seeding hydrothermal method. Such hydrothermal method eliminates the blocking of electrons by the dense seed layer and improves the electron transport speed and electron transport efficiency.

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).