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Facet-specific interaction between methanol and TiO2 probed by sum-frequency vibrational spectroscopy
Yang, DH; Li, YD; Liu, XY; Cao, Y; Gao, Y; Shen, YR; Liu, WT
2018
Source PublicationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
Volume115Issue:17Pages:E3888-E3894
Subtype期刊论文
AbstractThe facet-specific interaction between molecules and crystalline catalysts, such as titanium dioxides (TiO2), has attracted much attention due to possible facet-dependent reactivity. Using surface-sensitive sum-frequency vibrational spectroscopy, we have studied how methanol interacts with different common facets of crystalline TiO2, including rutile(110), (001), (100), and anatase(101), under ambient temperature and pressure. We found that methanol adsorbs predominantly in the molecular form on all of the four surfaces, while spontaneous dissociation into methoxy occurs preferentially when these surfaces become defective. Extraction of Fermi resonance coupling between stretch and bending modes of the methyl group in analyzing adsorbed methanol spectra allows determination of the methanol adsorption isotherm. The isotherms obtained for the four surfaces are nearly the same, yielding two adsorbed Gibbs free energies associated with two different adsorption configurations singled out by ab initio calculations. They are (i) similar to-20 kJ/mol for methanol with its oxygen attached to a low-coordinated surface titanium, and (ii) similar to-5 kJ/mol for methanol hydrogen-bonded to a surface oxygen and a neighboring methanol molecule. Despite similar adsorption energetics, the Fermi resonance coupling strength for adsorbed methanol appears to depend sensitively on the surface facet and coverage.
KeywordSingle-crystal Surfaces Anatase Tio2 Fermi Resonance In-situ Photocatalytic Dissociation Generation Spectroscopy Aqueous-methanol Rutile Tio2 Adsorption Water
DOI10.1073/pnas.1802741115
Indexed BySCI
Language英语
WOS IDWOS:000430697500007
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/29018
Collection中科院上海应用物理研究所2011-2018年
Affiliation1.Yang, DH
2.Li, YD
3.Liu, XY
4.Cao, Y
5.Gao, Y
6.Shen, YR
7.Liu, WT
Recommended Citation
GB/T 7714
Yang, DH,Li, YD,Liu, XY,et al. Facet-specific interaction between methanol and TiO2 probed by sum-frequency vibrational spectroscopy[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(17):E3888-E3894.
APA Yang, DH.,Li, YD.,Liu, XY.,Cao, Y.,Gao, Y.,...&Liu, WT.(2018).Facet-specific interaction between methanol and TiO2 probed by sum-frequency vibrational spectroscopy.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(17),E3888-E3894.
MLA Yang, DH,et al."Facet-specific interaction between methanol and TiO2 probed by sum-frequency vibrational spectroscopy".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.17(2018):E3888-E3894.
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