Enhanced diffusion of surface atoms at metal/electrolyte interface under potential control

被引：40

作者：

Hirai, N ^{[1
]}

Tanaka, H ^{[1
]}

Hara, S ^{[1
]}

机构：

[1] Osaka Univ, Fac Engn, Dept Mat Sci & Proc, Suita, Osaka 565, Japan

来源：

APPLIED SURFACE SCIENCE | 1998年 / 130卷

关键词：

atomic force microscopy; metal-electrolyte interface; silver; solid-liquid interface; surface diffusion; surface structure;

D O I：

10.1016/S0169-4332(98)00061-0

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：

We have investigated the surface self-diffusion coefficient (D(s)) on Ag(100) in aqueous 50 mM H(2)SO(4) solution using electrochemical atomic force microscopy (ECAFM). The results were compared with those observed on Au(100). The D(s) values of Ag(100) increased exponentially with potential between -50 and 350 mV (vs. normal hydrogen electrode, NHE). From the D(s)-E relationship, we propose that the activation energy of surface diffusion decreases because of the surface excess charge. We also found that the D(s) values on Ag(100) were a hundred times larger than those on Au(100) within the potential range from 150 to 350 mV (vs. NHE). (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：506 / 511

页数：6

共 7 条

[1] A STUDY OF SURFACE-DIFFUSION ON GOLD WITH AN ATOMIC-FORCE MICROSCOPE [J].