Electrochemical impedance analysis of nanoporous TiO2 electrode at low bias potential

TiO 2 colloid was prepared by the sol–gel method and was bladed on transparent conduction glass to made nanoporous electrode. The impedance performance of TiO 2 electrode was studied at various bias potential. A simplified equivalent circuit was proposed to investigate the charge transport impedance of TiO 2 film and good fitting results were obtained.