Size-selective reactivity of subnanometer Ag4 and Ag16 clusters on a TiO2 surface
- Argonne National Lab. (ANL), Argonne, IL (United States); National Taiwan Univ., Taipei (Taiwan)
- Argonne National Lab. (ANL), Argonne, IL (United States); ETH Zurich, Zurich (Switzerland)
- National Taiwan Univ., Taipei (Taiwan)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); ETH Zurich, Zurich (Switzerland)
Size-selected Ag4 and Ag16 clusters on a titania surface have been studied for their potential in CO oxidation using theoretical calculations and X-ray absorption near edge spectroscopy. The first peak at the measured Ag K-edge of Ag16@TiO2 is more prominent in air than in carbon monoxide environment, but no variation was found between the spectra of Ag4@TiO2 in air and in carbon monoxide environments. Density functional theory calculations show a preference for molecular oxygen adsorption for Ag4@TiO2 and that for a dissociative one on Ag16@TiO2, while carbon monoxide reactions with adsorbed oxygen reduced the Ag16@TiO2 cluster. The dissociated oxygen atoms increased the oxidation state of Ag16 cluster and resulted in the prominent first peak in Ag K-edge spectrum in quasi-particle theory calculations, with the subsequent carbon monoxide oxidation reversing the character of Ag K-edge spectrum associated with the reduction of the cluster. Finally, the results provide insight into the size selectivity of supported subnanometer silver clusters in their interactions with oxygen and carbon monoxide, with implications on the cluster catalytic properties in oxidative reactions.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1352919
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 121, Issue 12; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Preparation of gas phase naked silver cluster cations outside a mass spectrometer from ligand protected clusters in solution
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journal | January 2018 |
Electron injection study of photoexcitation effects on supported subnanometer Pt clusters for CO 2 photoreduction
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journal | January 2018 |
Understanding CO oxidation on the Pt(111) surface based on a reaction route network
|
journal | January 2019 |
Perspective: Size selected clusters for catalysis and electrochemistry
|
journal | March 2018 |
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