期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 370, 期 -, 页码 84-88出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2018.10.023
关键词
Titania; Photocatalysis; Charge transfer; FTIR spectroscopy; Carbon monoxide
资金
- NanoNextNL, a micro and nanotechnology consortium of the Government of The Netherlands and 130 partners [NNNL.02B.08 CO2Fix-1]
- Dutch National Research School Combination Catalysis Controlled by Chemical Design (NRSC-Catalysis)
The efficiency of photocatalytic systems is strongly depending on the charge carrier transfer from the excited semiconductor to co-catalyst particles attached on its surface. In this study, we investigated the influence of photo-induced charge transfer in photoplatinized TiO2 P25 photocatalysts by diffuse reflectance FTIR spectros-copy of CO molecules adsorbed on the Pt co-catalyst under well-defined gas phase conditions. In contrast to aqueous conditions, where shifts of the CO stretching vibration of up to 50 cm(-1) have been reported, the observed shifts under gas phase conditions are very small (< 1 cm(-1)). This demonstrates that the difference in dielectric properties between aqueous electrolytes and vacuum are critical for the development of prominent shifts of adsorbed CO bands upon trapping of photogenerated charge carriers on co-catalyst particles. The experimental findings are discussed in terms of an electrostatic Stark effect, charge screening, co-adsorption, coverage-dependent shifts of the vibrational bands of adsorbed CO and photocatalytic surface reactions.
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