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Title: Size-selective reactivity of subnanometer Ag4 and Ag16 clusters on a TiO2 surface

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [4];  [5];  [5]; ORCiD logo [6]; ORCiD logo [4]; ORCiD logo [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); National Taiwan Univ., Taipei (Taiwan)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); ETH Zurich, Zurich (Switzerland)
  3. National Taiwan Univ., Taipei (Taiwan)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  6. 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
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (4)

Preparation of gas phase naked silver cluster cations outside a mass spectrometer from ligand protected clusters in solution journal January 2018
Electron injection study of photoexcitation effects on supported subnanometer Pt clusters for CO 2 photoreduction 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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