Adlayer structures of CO adsorbed on Ni(111) electrode surfaces studied by in situ STM combined with IRAS

被引：16

作者：

Ikemiya, N ^{[1
]}

Suzuki, T ^{[1
]}

Ito, M ^{[1
]}

机构：

[1] Keio Univ, Fac Sci & Technol, Dept Chem, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan

来源：

SURFACE SCIENCE | 2000年 / 466卷 / 1-3期

关键词：

carbon monoxide; chemisorption; metal-electrolyte interfaces; nickel; scanning tunneling microscopy; single crystal surfaces;

D O I：

10.1016/S0039-6028(00)00742-1

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：

In situ scanning tunneling microscopy (STM) combined with infrared reflection absorption spectroscopy (IRAS) has been used to investigate the coverage-dependent structural changes of CO adlayers adsorbed on Ni(111) in solution. Two different structures were obtained in a CO-containing Na2SO4 (pH 3) solution depending on the CO coverage. At low CO coverage, it was found that a (root3 x root3)R30 degrees structure with a coverage of 0.33 ML started to form, where all the CO molecules occupy the bridge sites. A further increase in the CO coverage gave rise to the formation of a new c(4 x 2) structure with a coverage of 0.5 ML until adlayer saturation. The combined in situ TM and IRAS results showed equal occupations of the on-top and bridge CO species in the c(4 x 2) phase. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：119 / 126

页数：8

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