The adsorption and oxidation of carbon monoxide at the Pt(111)/electrolyte interface: atomic structure and surface relaxation

被引：106

作者：

Lucas, CA ^{[1
]}

Markovic, NM

Ross, PN

机构：

[1] Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

SURFACE SCIENCE | 1999年 / 425卷 / 01期

关键词：

atomic structure; carbon monoxide; Pt(111); surface relaxation;

D O I：

10.1016/S0039-6028(99)00252-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using in-situ X-ray diffraction we have studied the adsorption of CO onto Pt(111) in pure perchloric acid. The adsorption of CO at an applied electrode potential of 0.05 V (versus the reversible hydrogen electrode) causes expansion of the topmost Pt atomic layer by similar to 4% of the bulk lattice spacing. Ar this potential the adsorbed CO forms a compressed p(2 x 2) adlayer which fully covers the Pt surface. As the potential is stepped positively, the p(2 x 2) structure undergoes an order-disorder transition which appears to be triggered by oxidation of a small fraction of the adsorbed CO adlayer and is reversible or irreversible according to the overpressure of CO. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：L381 / L386

页数：6

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