XPS STUDIES ON EMERSED SILVER ELECTRODES - COVERAGE AND BONDING STATE OF SPECIFICALLY ADSORBED CHLORIDE

被引:29
作者
KAUTEK, W [1 ]
GORDON, JG [1 ]
机构
[1] IBM CORP, ALMADEN RES CTR, SAN JOSE, CA 95120 USA
关键词
D O I
10.1149/1.2086229
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The coverage of chloride adsorbed on a silver electrode has been measured as a function of potential using ex situ x-ray photoelectron spectroscopy (XPS). Two types of chlorine have been observed. A specifically adsorbed chlorine species with its Cl 2p3/2 electron binding energy around 198.6 eV represents the major adsorbant. Its coverage depends strongly on the electrode potential and its concentration in the bulk electrolyte. The minor component appears at a lower electron binding energy of 197.3 eV, characteristic of ionicly bonded chlorine. This species increases in coverage relative to the higher energy form after a so-called oxidation-reduction cycle. With this, an independent experimental support is provided for the recent concept of the chemical nature of surface-enhanced Raman-active sites involving low metal oxidation states. © 1990, The Electrochemical Society, Inc. All rights reserved.
引用
收藏
页码:3405 / 3409
页数:5
相关论文
共 63 条