Keywords TiO N-doped TiO Conduction-band electrons Shallow-trap 2 2 electrons Adsorbed ethanol FTIR Photocatalysis Introduction Photocatalysis involves light-induced generation of electron–hole pairs and transfer of electrons and holes to adsorbed species on the semiconductor catalyst surface [1–4]. The overall quantum efﬁciency of a photocatalysis process is governed by the rates of charge separation, interfacial charge transfer, trapping, and recombination [5–7]. Photo-generated electrons and holes must reach the catalyst surface sites to initiate the charge transfer reaction for converting the adsorbed reactants to products. Many photocatalytic reactions are limited by the rapid recombination of electrons and holes. Although the time scales of photocatalytic steps range from femtoseconds to nanoseconds , the photo-generated electrons produced from adsorbed species can persist in TiO for a long period of time at a scale of minutes to hours after terminating UV irradiation . These long-life electrons, which do not get involved in either recombination with holes or transfer to the catalytic site, could stay in the conduction band and in the shallow/deep traps. The trapped electrons have been 3? associated with Ti of which optical and electrical properties are affected by its surrounding lattice . Many studies on
Research on Chemical Intermediates – Springer Journals
Published: Jul 19, 2017
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