Preparation and characterisation of visible light responsive iodine doped TiO_2 electrodes

摘要

Characteristics are presented of new iodine doped TiO_2 (I-TiO_2) prepared via the hydrothermal method, where titania (IV) complexes with a ligand containing an iodine atom have been used as a precursor. The structure of samples has been examined by XPS, XRD, UV-vis and FT-IR-ATR techniques. These studies confirm that the obtained powder exhibits a decrease in the bandgap energy value (E_g=2.8eV). The report presents electrochemical studies of I-TiO_2 films on a Pt electrode, which allow determination of the flatband potential E_(fb) = -0.437 V vs. SCE (in 0.5 M Na_2SO_4). Cyclic voltammetry measurements show anodic and cathodic activities under Vis and UV-vis radiation. The photocurrent enhancement due to visible light radiation reached 30% of the whole photoacitivity exhibited under UV-vis illumination.