Effect of Al2O3 support on electrical properties of TiO2/Al2O3 membrane formed by sol–gel method

Abstract The membrane potential of the composite membrane, TiO 2 /Al 2 O 3 , and the Al 2 O 3 support were measured to characterize the membrane charge of TiO 2 /Al 2 O 3 membrane and to make clear the effect of Al 2 O 3 support. As the results, it is shown that it is impossible to neglect the effect of the support due to its charge. It is also shown that the TiO 2 /Al 2 O 3 membrane will be bipolar between pH 6.2 and 7.4.