Effect of TiO₂ substrate on electrochromic properties of MoO₃/TiO₂ composite films

Abstract

TiO2 nanowires were prepared on fluorine-doped tin oxide(FTO) glass by hydrothermal synthesis, and then the MoO3/TiO2 composite films were prepared by electrodepositing MoO3 films onto TiO2 nanowire arrays. The parameters such as diffusion coefficient(D), the responding time of colored and bleached, optical density(ΔOD), electrochromic reversibility and coloration efficiency of MoO3/TiO2 composite film were obtained by electrochromical measurement technologies and spectrum tests. The effect of TiO2 nanowire substrates with different hydrothermal growth time on the electrochromic properties of MoO3/TiO2 composite films was studied. The results show that the MoO3/TiO2 composite films with 6 hours of hydrothermal growth TiO2 nanowires have the best electrochromic properties. The diffusion coefficient is 2.86×10-12 cm2·s-1, the cyclic reversibility is 60.88%, the optical density is 0.41, the coloring efficiency reaches 124.49 cm2·C-1, and its responding time of colored and bleached is 13.53 s and 12.65 s.

Keywords

• thin film
• electrochromism
• electrochromic measurement
• tio₂
• moo₃