Fabrication of Photoelectrochromic Devices Composed of Anodized TiO2 and WO3 Nanostructures

Abstract

Abstract In this study, we demonstrate the photoelectrochromic devices composed of TiO 2 and WO 3 nanostructuresprepared by anodization method. The morphology and the crystal structure of anodized TiO 2 nanotubes and WO 3 nan-oporous layers are investigated by SEM and XRD. To fabricate a transparent photoelectrode on FTO substrate, a TiO 2 nanotube membrane, which has been detached from Ti substrate, is transferred to FTO substrate and annealed at 450°Cfor 1 hr. The photoelectrode of TiO 2 nanotube and the counter electrode of WO 3 nanoporous layer are assembled andthe inner space is filled with a liquid electrolyte containing 0.5 M LiI and 5 mM I 2 as a redox mediator. The propertiesof the photoelectrochromic devices is investigated and Pt-WO 3 electrode system shows better electrochromic perform-ance compared toWO 3 electrode. Keywords: Electrochromism, Photoelectrochromic Devices, TiO 2 nanotubes, WO 3 nanoporous layers, Anodization ······························································································································· ·································································································