INSITU SCANNING TUNNELING MICROSCOPY AS A PROBE OF ADSORBATE-INDUCED RECONSTRUCTION AT ORDERED MONOCRYSTALLINE ELECTRODES - CO ON PT(100)

被引:88
作者
VITUS, CM [1 ]
CHANG, SC [1 ]
SCHARDT, BC [1 ]
WEAVER, MJ [1 ]
机构
[1] PURDUE UNIV, DEPT CHEM, W LAFAYETTE, IN 47907 USA
关键词
D O I
10.1021/j100173a001
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
The atomic-level structure of ordered Pt(100) electrodes prepared by air-hydrogen flame annealing followed by iodine dosing and solution-phase replacement by CO has been examined by in situ scanning tunneling microscopy. While large (1 x 1) substrate terraces are discernible in the presence of iodine adlayers, subsequent CO adsorption in 0.1 M HClO4 yields dense arrays of smaller, 20-40 angstrom, (1 x 1) islands. These domains coalesce upon positive alterations in the electrode potential. Parallel in situ infrared spectroscopic measurements shows that these structural changes are accompanied by an attenuation of bridge-bound CO in the close-packed adlayer structure. The bridging CO is speculated to be present at the edges of the (1 x 1) domains, contained within which are predominantly atop-coordinated CO.
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页码:7559 / 7563
页数:5
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