Decorated Ru/Au(111) and Os/Au(111) surfaces: An in situ STM and electrochemistry study

被引：4
|
作者：
Strbac, S.
Johnston, C. M.
Wieckowski, A.
机构：
[1] Univ Belgrade, ICTM Inst Electrochem, Belgrade 11001, Serbia
[2] Univ Illinois, Urbana, IL 61801 USA
来源：
RUSSIAN JOURNAL OF ELECTROCHEMISTRY | 2006年 / 42卷 / 11期
基金：
美国国家科学基金会;
关键词：
gold single crystal; ruthenium; osmium; bimetallic nanocatalysts; in situ STM;
D O I：
10.1134/S1023193506110115
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The structure and reactivity of bimetallic electrodes obtained by spontaneous deposition of Ru and Os on Au(l 11) single-crystal surfaces are studied. In situ electrochemical STM and cyclic voltammetry are used to characterize a wide range of surface morphologies thus produced. The STM results on Ru/Au(l 11) demonstrate a pronounced step decoration, while a random distribution of Ru nuclei, quite uniform in size, occurs on terraces. Osmium deposits show a slight preference for deposition on steps, but it also occurs readily on terraces. However, many of the Os islands grow into multilayer heights. The coverage of the Au(l 11) by the deposited Ru or Os islands for a particular solution concentration depends on the deposition time. Nanostructures of Ru and Os are tested for catalytic behavior and correlated to CO oxidation activity as measured by CO stripping voltammetry.
引用
收藏
页码：1244 / 1250
页数：7
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