Energy Efficient Electrochromic Windows Prepared with Dual WO3-layered Electrodes

An energy efficient dual-WO
3
electrode was fabricated for electrochromic window application. A vapor-coated WO
3
was prepared using the sputtering deposition method, and a wet-coated WO
3
film was prepared with the wet chemical reaction process. The WO
3
was amorphous crystalline. The intercalated charge of the electrode with a dual-WO
3
layer was 0.0265 C/cm
²
. High contrast ratio of 55.8% and fast responses of 6 s for charge intercalation and 1.8 s for deintercalation were achieved.