COMPARATIVE ANALYSIS OF ELECTROCHROMIC PROPERTIES OF CuWO4•WO3, Bi2WO6•WO3 AND WO3 THIN FILMS

A comparative analysis of electrochromic properties of composites CuWO4•WO3, Bi2WO6•WO3 and WO3 films obtained by electrochemical and chemical methods was carried out. The study into the kinetics of light transmission and spectral characteristics of electrochromic coloration revealed some differences in electrochromic processes. It found that in the WO3, Bi2WO6•WO3, CuWO4•WO3 series, lithium intercalation in the film is slowed down, which is due to diffusion limitations in the process of coloring of the Bi and Cu oxides. Spectral characteristics of light transmission Bi2WO6•WO3 and CuWO4•WO3 also differ from WO3 in that the contribution to light absorption is also made by Bi and Cu oxides, which are partially reduced by lithium in the process of their coloring. It is shown that the metal tungstates can be effective electrochromic materials with an additional absorption band in the visible region