Preparation of titania-coated alumina film by electrolysis of TiCl4-containing solution

Direct current in the range from 50 to 390 mA/cm2 was flowed between alumina/tin-doped indium oxide (indium tin oxide, ITO) composite (cathode) and carbon (anode) electrodes in an aqueous solution containing TiCl4 and (NH4)2SO4 at pH 0.5. The composite electrode dissolved in the solution and was precipitated again on the surface of the electrode. The thickness of precipitated layer increased at a higher applied charge. During the electrolysis, TiO2 was also deposited on the surface of precipitated layer. The amorphous TiO2 heated at 300 °C and sintered Al2O3–ITO composite showed a good adsorption property of electromagnetic energy in the wide wavelength of 200–800 nm.