On the valence state of bismuth adsorbed on a Pt(111) electrode: an electrochemistry, LEED and XPS study

被引：73
|
作者：
Hamm, UW [1 ]
Kramer, D [1 ]
Zhai, RS [1 ]
Kolb, DM [1 ]
机构：
[1] Univ Ulm, Dept Electrochem, D-89069 Ulm, Germany
来源：
ELECTROCHIMICA ACTA | 1998年 / 43卷 / 19-20期
关键词：
D O I：
10.1016/S0013-4686(98)00037-1
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The valence state of Bi on Pt(lll) which is irreversibly deposited at underpotentials from perchloric acid solutions, has been determined ex-situ by XPS for various emersion potentials. From chemical shift measurements it is inferred that the adsorbed Bi remains in its zero-valent state over the entire potential range under study, despite a substantial charge flow during cycling. This charge is attributed to OH-adsorption on the Pi-covered Pt(lll) surface rather than to a change in Valence state of the adsorbed Bi. as was previously suggested. Superstructures were observed in the LEED patterns and are assigned to ordered Bi adlayers. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：2969 / 2978
页数：10
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