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

被引：15
作者：
Konstantinova, Elizaveta A. [1 ,2 ,3 ]
Kokorin, Alexander I. [4 ]
Minnekhanov, Anton A. [2 ]
Sviridova, Tatyana V. [5 ]
Sviridov, Dmitry V. [5 ]
机构：
[1] Moscow MV Lomonosov State Univ, Fac Phys, Leninskie Gory 1-2, Moscow 119991, Russia
[2] Natl Res Ctr, Kurchatov Inst, Akad Kurchatova 1, Moscow 123182, Russia
[3] Moscow Inst Phys & Technol, Dept Nano Bio Informat Technol & Cognit Sci, Inst Skij 9, Dolgoprudnyi 141701, Moscow Region, Russia
[4] RAS, N Semenov Inst Chem Phys, Kosygina 4, Moscow 119991, Russia
[5] Belarusian State Univ, Dept Chem, Nezavisimosti Ave 4, Minsk 220030, BELARUS
来源：
CATALYSIS LETTERS | 2019年 / 149卷 / 08期
基金：
俄罗斯基础研究基金会;
关键词：
Photocatalysis; Titanium dioxide; Electron paramagnetic resonance; Heterostructures; Charge accumulation; MOLYBDENUM-VANADIUM OXIDES; TITANIUM-DIOXIDE; ENERGY-STORAGE; MECHANOCHEMICAL TREATMENT; CATALYTIC-OXIDATION; REDUCED STATES; SPECTROSCOPY; REACTIVITY; SYSTEMS; MOO3;
D O I：
10.1007/s10562-019-02830-7
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 N-14 atoms containing the unpaired electron (N-center dot-radicals), have been performed. The temperature behavior of PCs in the range of 30-300K 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 5h) under the dark conditions after illumination. [GRAPHICS] .
引用
收藏
页码：2256 / 2267
页数：12
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