In-situ XAFS studies of Br adsorption on the silver(111) electrode

被引：17

作者：

Endo, O ^{[1
]}

Matsumura, D ^{[1
]}

Kohdate, K ^{[1
]}

Kiguchi, M ^{[1
]}

Yokoyama, T ^{[1
]}

Ohta, T ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2000年 / 494卷 / 02期

关键词：

extended x-ray absorption fine structure (EXAFS); chemisorption; bromine; electrochemical interface; silver(111);

D O I：

10.1016/S0022-0728(00)00338-7

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The structures of adsorbed bromine on the Ag(111) electrode at different applied potentials have been studied by in situ X-ray absorption fine structure (XAFS) spectroscopy. The bromine coverage was estimated by the Br K-edge jump height as a function of the electrode potential. It turned out that the coverage does not change in passing through a characteristic peak appearing at 0.05 V (versus Ag \ AgCl) in the cyclic voltammogram (CV). Analysis of the Br K-EXAFS spectra just below the CV peak gave the Br-Ag bond distance of 2.72 +/- 0.05 Angstrom, while the spectra above the peak revealed the presence of two different Br-Ag bonds with 2.74 +/- 0.05 and 2.80 +/- 0.05 Angstrom distances. These results suggest that a drastic surface reconstruction takes place at the characteristic CV peak without changing the surface Br density. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：121 / 126

页数：6

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