Anatase titanium dioxide nanoparticles were synthesis by anodization of titanium foil in sodium sulfate solution at pH 3, containing 1–5 mmol·L-1 of Fe2+ cations as a FeSO4 salt. During the anodization, from 0.05 to 0.1 mol∙L-1 H2 O2 was added dropwise to the electrolyte to performed Advanced Oxidation Processes, based on hydroxyl radical formation by H2 O2 decomposition in the presence of Fe2+ ions in acidic medium. The anodization voltage varied from 10 to 20 V. The size of the synthesized particles of TiO2 ranged from 30 to 50 nm, which the morphology and structure of which were described by scanning electron microscopy (SEM) images and XRD pattern. The photocatalytic activity of TiO2 nanoparticles, obtained by the described method was studied by using the photo-destruction reaction of the methylene blue in an aqueous solution under the influence of ultraviolet irradiation. The dye-sensitized solar cells (DSSCs) were fabricated by the obtained TiO2 and exhibited the light to electric energy conversion efficiency -5.54%, the short circuit current density - 14.3 mA∙ cm-2, the open circuit voltage - 0.72 V, and the fill factor -52.46%.
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