Electronic conductivity in nanostructured TiO2 films permeated with electrolyte

Abstract

By combining two experimental techniques, electrochemical impedance spectroscopy (EIS) and the coplanar electrodes–gap configuration, we monitored the electronic conductivity in nanoporous TiO2 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 × 10–3 Ω–1 cm–1.