Photoelectrochemical Behavior of Nanostructured TiO2 Thin-Film Electrodes in Contact with Aqueous Electrolytes Containing Dissolved Pollutants: A Model for Distinguishing between Direct and Indirect Interfacial Hole Transfer from Photocurrent Measurements

摘要: A model for describing the photoelectrochemical behavior of nanostructured TiO2 thin-film electrodes in contact with aqueous electrolytes containing dissolved pollutant species is presented. The correlates steady-state photocurrent, illumination intensity, and specific photooxidation mechanism competition water molecules. For physical events, considers existence hole trapping at surface states hole-transfer mechanisms taking place semiconductor−electrolyte interface (direct, via photogenerated valence-band free holes or indirect, surface-bound OH radicals both). has been applied to study solutions formic acid methanol. In agreement previous results concerning massive polycrystalline electrodes, methanol found be photooxidized indirect transfer, whereas mainly participation ...