Hydrogen bonding in mixed OH+H2O overlayers on Pt(111) -: art. no. 046102

被引：172

作者：

Clay, C ^{[1
]}

Haq, S ^{[1
]}

Hodgson, A ^{[1
]}

机构：

[1] Univ Liverpool, Surface Sci Res Ctr, Liverpool L69 3BX, Merseyside, England

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.92.046102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 (root3 x root3)R30degrees-(OH+H2O) lattice with a weak (3x3) superstructure, caused by ordering of the hydrogen bonds. The mixed overlayer can accommodate a range of H2O/OH compositions but becomes less stable as the H2O content is reduced, causing defects in the hydrogen-bonding network that lift the (3x3) superstructure and destabilize the overlayer.

引用

页数：4

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