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Hydrogen bonding in mixed OH+H2O overlayers on Pt(111).

Authors
  • Clay, C
  • Haq, S
  • Hodgson, A
Type
Published Article
Journal
Physical review letters
Publication Date
Jan 30, 2004
Volume
92
Issue
4
Pages
46102–46102
Identifiers
PMID: 14995388
Source
Medline
License
Unknown

Abstract

The stability of OH on Pt(111) has been investigated to determine the role of hydrogen bonding in stabilizing the overlayer. We find that the optimal structure is a mixed (OH+H2O) phase, confirming recent density-functional theory predictions. The reaction O+3H(2)O forms a hexagonal (sqrt[3]xsqrt[3])R30 degrees -(OH+H2O) lattice with a weak (3x3) superstructure, caused by ordering of the hydrogen bonds. The mixed overlayer can accommodate a range of H(2)O/OH compositions but becomes less stable as the H2O content is reduced, causing defects in the hydrogen-bonding network that lift the (3 x 3) superstructure and destabilize the overlayer.

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