Oxygen Adsorption on Au–Ni(111) Surface Alloys
Name
Leon, Lee, Ceyer Final.pdf
Description
main article
Size
4.41 MB
Format
Adobe PDF
Checksum (MD5)
93393271231839aa952cc41f981e021f
Author(s)
Lee, Jae-Gook
Leon, Christopher Chih-Wan Loo
Ceyer, Sylvia
Date Issued
May 2014
Journal
The Journal of Physical Chemistry C
Publisher
American Chemical Society (ACS)
Citation
Leon, Christopher C., Jae-Gook Lee, and S. T. Ceyer. “Oxygen Adsorption on Au–Ni(111) Surface Alloys.” The Journal of Physical Chemistry C 118, no. 50 (December 18, 2014): 29043–29057.
Version
Author's final manuscript
Abstract
Molecular O[subscript 2] dissociates upon interaction with a Ni(111) surface, as the spatial and energetic overlap between the Ni 3d electrons and the O[subscript 2] antibonding orbitals is quite favorable. On a Au–Ni(111) surface alloy where the extent of this overlap is greatly reduced, exposure to O[subscript 2] results in adsorption of molecular O[subscript 2] characterized by three peroxo- or superoxo-like vibrational bands centered at 743, 856, and 957 cm[superscript –1] as observed by high resolution electron energy loss spectroscopy. These bands correspond to the stretch vibrational mode of O[subscript 2] at respective adsorption sites of type pseudo-3-fold fcc/hcp, degenerate-pseudo-2-fold fcc/hcp and bridge, and pseudo-3-fold bridge. These unusual chemical environments are brought about by surface alloying, rather than the presence of Au clusters on Ni, and are further stabilized by a dramatic reconstruction of the top two surface layers, as explained with an idealized surface alloy model in conjunction with electronic structure considerations. The ability to adjust the relative populations of the different oxygen cohorts by varying the Au content suggests the utility of surface alloy motifs for engineering applications.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1021/jp503758t
