Active Species in Photocatalytic Reactions of Methanol on TiO2(110) Identified by Surface Sum Frequency Generation Vibrational Spectroscopy
| Autor: | Xueming Yang, Ruidan Zhang, Chuanyao Zhou, Ran-ran Feng, An-an Liu, Zefeng Ren, Ying Jiang, Xingxing Peng, Qing Guo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Methyl formate
Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy Adsorption chemistry Monolayer Photocatalysis Methanol Physical and Theoretical Chemistry 0210 nano-technology Photodegradation |
| Zdroj: | The Journal of Physical Chemistry C. 123:13789-13794 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.9b03922 |
| Popis: | The photocatalytic reactivity of one monolayer of methanol on TiO2(110) was measured with the surface sum frequency generation vibrational spectroscopy in the C-H stretching range, which shows high photon energy dependence. The photocatalytic reactivity was systematically investigated for different active species on TiO2(110), dissociative adsorbed methanol at five-coordinated Ti sites (Ti-5c), methoxy without adsorbed methanol at Ti-5c sites, and methoxy O-b sites. The results show that the methoxy at Ti-5c sites has much higher photocatalytic reactivity than that of dissociative adsorbed methanol at Ti-5c sites, and the methoxy at O-b sites might be inactive. This work demonstrates that methoxy at Ti-5c sites is the most active species on TiO2(110) and suggests that effectively removing surface OH could enhance the photodegradation of surface organics. |
| Databáze: | OpenAIRE |
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