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EPR Study of Photoexcited Charge Carrier Behavior in TiO2/MoO3 and TiO2/MoO3:V2O5 Photocatalysts

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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.

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Acknowledgements

The experiments were performed using the facilities of the Collective Use Center at the Moscow State University. This study was supported in part by the Russian Foundation for Basic Research (Grant No. 18-53-00020-Bel-a) and Belarus Republic Fund for Basic Research (Grant No. Kh17-066).

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Authors and Affiliations

  1. Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow, Russia, 119991

    Elizaveta A. Konstantinova

  2. National Research Center Kurchatov Institute, Akademika Kurchatova 1, Moscow, Russia, 123182

    Elizaveta A. Konstantinova & Anton A. Minnekhanov

  3. Department of Nano-, Bio-, Information Technology and Cognitive Science, Moscow Institute of Physics and Technology, Institutskij 9, Dolgoprudny, Moscow Region, Russia, 141701

    Elizaveta A. Konstantinova

  4. N. Semenov Institute of Chemical Physics RAS, Kosygina 4, Moscow, Russia, 119991

    Alexander I. Kokorin

  5. Department of Chemistry, Belarusian State University, Nezavisimosti ave. 4, 220030, Minsk, Belarus

    Tatyana V. Sviridova & Dmitry V. Sviridov

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  1. Elizaveta A. Konstantinova
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  2. Alexander I. Kokorin
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  3. Anton A. Minnekhanov
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  4. Tatyana V. Sviridova
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Correspondence to Elizaveta A. Konstantinova.

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Konstantinova, E.A., Kokorin, A.I., Minnekhanov, A.A. et al. EPR Study of Photoexcited Charge Carrier Behavior in TiO2/MoO3 and TiO2/MoO3:V2O5 Photocatalysts. Catal Lett 149, 2256–2267 (2019). https://doi.org/10.1007/s10562-019-02830-7

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