Dynamics of Adsorbed CO Molecules on the TiO2 Surface under UV Irradiation

被引：0
作者：
Bulanin, Kirill M. M. [1 ,2 ]
Emeline, Alexei V. V. [1 ]
Mikhaylov, Ruslan V. V. [1 ]
Mikheleva, Alena Y. Y. [1 ]
Rudakova, Aida V. V. [1 ]
Ryabchuk, Vladimir K. K. [1 ]
机构：
[1] St Petersburg State Univ, Lab Photoact Nanocomposite Mat, St Petersburg 198504, Russia
[2] Irkutsk Natl Res Tech Univ, Inst Quantum Phys, Irkutsk 664074, Russia
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2023年 / 127卷 / 23期
关键词：
HETEROGENEOUS PHOTOCATALYSIS; CARBON-MONOXIDE; METAL-OXIDES; SPECTROSCOPIC CHARACTERIZATION; TITANIUM-DIOXIDE; POINT-DEFECTS; ADSORPTION; REDUCTION; WATER; PHOTOADSORPTION;
D O I：
10.1021/acs.jpcc.3c00757
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：
In this work, the UV-stimulated processesin the TiO2-COg system were exploredby in situ FTIRspectroscopyand photoelectron spectroscopy. Kinetic dependences of the total bandintensity for adsorbed CO and background absorption, as well as thepositions of the Fermi level in TiO2 before, during, andafter UV irradiation of the system, were analyzed and compared. Theobserved reversible shift in the adsorption-desorption equilibriumwas explained by changing the electronic state of the photocatalystunder UV irradiation. The proposed mechanism of photostimulated COadsorption and CO re-adsorption in the TiO2-COg system is described in detail. A deflection of reversibilityof molecular photodesorption-re-adsorption dynamics is causedby the side reaction of CO photooxidation and the formation of stronglybound surface carbonates.
引用
收藏
页码：11005 / 11013
页数：9
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