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Counter electrodes for WO/sub 3/-based electrochromic coatings

Żelazowska E., Ziemba B., Lachman W.

Optica Applicata

2000

Vol. 30, nr 4

663-670

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 SnO/sub 2/:F, using acetylacetonates as precursor materials. The substrate temperature was held at 600 degrees C for WO/sub 3/ and 680 degrees C for the other metal oxide films. Electrochromic colouration and bleaching characteristics were examined in the transmissive electrochromic cell arrangement, using LiClO/sub 4/-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.