Electronic conductivity in nanostructured TiO2 films permeated with electrolyte

By combining two experimental techniques, electrochemical impedance spectroscopy (EIS) and the coplanar electrodes-gap configuration, we monitored the electronic conductivity in nanoporous Ti0 2 in aqueous solution (pH 2) as a function of the electrode potential. As a result of electron accumulation the conductivity varies over more than eight orders of magnitude up to a maximum σ = 3.7 x 10 -3 Ω -1 cm -1 .