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Transient hydroxyl formation from water on oxygen-covered Au(111)

J. Chem. Phys. 129, 064702 (2008); doi:10.1063/1.2965821

Published 8 August 2008

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R. G. Quiller,1 T. A. Baker,2 X. Deng,2 M. E. Colling,2 B. K. Min,3 and C. M. Friend1,2
1School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, Massachusetts 02138, USA
2Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford St., Cambridge, Massachusetts 02138, USA
3Clean Energy Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea
We present evidence for the formation of transient hydroxyls from the reaction of water with atomic oxygen on Au(111) and investigate the effect of adsorbed oxygen on the hydrogen bonding of water. Water is evolved in peaks at 175 and 195 K in temperature programed reaction experiments following adsorption of water on oxygen-covered Au(111). The peak at 175 K is ascribed to sublimation of multilayers of water, whereas the peak at 195 K is associated with oxygen-stabilized water or a water-hydroxyl surface complex. Infrared reflection absorption spectra are consistent with the presence of molecular water over the entire range of coverages studied, indicating that isolated stable hydroxyls are not formed. Isotopic exchange of adsorbed 16O with H<sub>2</sub><sup>18</sup>O following adsorption and subsequent temperature programed reaction, however, indicates that transient OH species are formed. The extent of oxygen exchange was considerable—up to 70%. The degree of oxygen exchange depends on the initial coverage of oxygen, the surface temperature when preparing oxygen adatoms, and the H<sub>2</sub><sup>18</sup>O coverage. The hydroxyls are short-lived, forming and disproportionating multiple times before water desorption during temperature programed reaction. It was also found that chemisorbed oxygen is critical in the formation of hydroxyls and stabilizing water, whereas gold oxide does not contribute to these effects. These results identify transient hydroxyls as species that could play a critical role in oxidative chemical reactions on gold, especially in ambient water vapor. The crystallinity of adsorbed water also depended on the degree of surface ordering and chemical modification based on scanning tunneling microscopy and infrared spectra. These results demonstrate that oxidation of interfaces has a major impact on their interaction with water. ©2008 American Institute of Physics
History: Received 3 June 2008; accepted 8 July 2008; published 8 August 2008
Permalink: http://link.aip.org/link/?JCPSA6/129/064702/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.43.-h
    Chemisorption/physisorption: adsorbates on surfaces
  • 78.30.-j
    Infrared and Raman spectra (condensed matter)
  • YEAR: 2008

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0021-9606 (print)   1089-7690 (online)
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