Hydrogen bonding in mixed OH+H2O overlayers on Pt(111) |
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Authors: | Clay C Haq S Hodgson A |
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Affiliation: | Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, United Kingdom. |
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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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