All-solid-state electrochromic window of electrodeposited WO3 and prussian blue with poly(ethylene oxide) gel electrolyte

An all-solid-state electrochromic window (SEW) employing electrodeposited WO3 and prussian blue with polymer gel electrolyte has been fabricated. The conductivity of poly(ethylene oxide) (PEO)-based gel electrolyte was 4.6 x 10(-4) S/cm at room temperature. The W 4f core level spectra of WO3 film at different levels of coloration have been investigated using XPS. W 4f peaks become broader after coloration. The SEW has been found to have excellent electrochromism and memory characteristics. A reversible color change between blue and colorless was observed when an appropriate potential was applied repeatedly to the electrochromic window.