Vol. 30, Issue 4, pp. 663-670
Abstract
Thin polycrystalline electrochromic tungsten trioxide as well as nickel, vanadium and titanium oxide films with and without lithium additive were prepared by spray pyrolysis on glass coated with SnO2:F, using acetylacetonates as precursor materials. The substrate temperature was held at 600 degrees C for WO3 and 680 degrees C for the other metal oxide films. Electrochromic colouration and bleaching characteristics were examined in the transmissive electrochromic cell arrangement, using LiClO4/-poly(ethylene oxide) polymer electrolyte and significant changes of optical transmission in the visible and solar range, up to 70%, were observed. The obtained films were electrochemically stable and colouration and bleaching cycles were reversible at a voltage of +or-(1-25) V. The start of the electrochemical reactions for most of the films obtained was observed in the range of +or-(0.3-4) V.