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

Abstract Direct current in the range from 50 to 390 mA/cm 2 was flowed between alumina/tin-doped indium oxide (indium tin oxide, ITO) composite (cathode) and carbon (anode) electrodes in an aqueous solution containing TiCl 4 and (NH 4 ) 2 SO 4 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, TiO 2 was also deposited on the surface of precipitated layer. The amorphous TiO 2 heated at 300 °C and sintered Al 2 O 3 –ITO composite showed a good adsorption property of electromagnetic energy in the wide wavelength of 200–800 nm.