EPR Study of Photoexcited Charge Carrier Behavior in TiO2/MoO3 and TiO2/MoO3:V2O5 Photocatalystsстатья
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Дата последнего поиска статьи во внешних источниках: 15 августа 2019 г.
Аннотация:Metal oxide photocatalysts TiO2/MoO3 and TiO2/MoO3:V2O5 have been investigated by electron paramagnetic resonance (EPR) spectroscopy under in situ light excitation. Structural identification of all paramagnetic centers (PCs) recorded, such as surface and lattice Ti3+ ions as well as Mo5+ and V4+ ions and nitrogen 14N atoms containing the unpaired electron (“N•-radicals”), have been performed. The temperature behavior of PCs in the range of 30–300 K and photoinduced changes of EPR spectra under light irradiation have been investigated. The validity of the Curie law was confirmed for the PCs of such composite photocatalysts. A new original method of detection of charge carrier separation and accumulation is suggested using EPR-technique. It is shown that TiO2/MoO3 and TiO2/MoO3:V2O5 photocatalysts are capable to accumulate photogenerated charge providing fresh possibilities for practical applications in photocatalysis because these oxide heterostructures retaining oxidation activity for a long time (more than 5 hours) under the dark conditions after illumination.