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.