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- Title
EPR Study of Photoexcited Charge Carrier Behavior in TiO<sub>2</sub>/MoO<sub>3</sub> and TiO<sub>2</sub>/MoO<sub>3</sub>:V<sub>2</sub>O<sub>5</sub> Photocatalysts.
- Authors
Konstantinova, Elizaveta A.; Kokorin, Alexander I.; Minnekhanov, Anton A.; Sviridova, Tatyana V.; Sviridov, Dmitry V.
- Abstract
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 h) under the dark conditions after illumination.
- Subjects
MOLYBDENUM ions; CHARGE carriers; PHOTOCATALYSTS; ELECTRON paramagnetic resonance; METALLIC oxides
- Publication
Catalysis Letters, 2019, Vol 149, Issue 8, p2256
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-019-02830-7