Potential dependence of the step line tension on surfaces in contact with an electrolyte

被引:20
作者
Ibach, H
Giesen, M
Schmickler, W
机构
[1] Forschungszentrum Julich, Inst Schichten & Grenzflachen, D-52425 Julich, Germany
[2] Univ Ulm, Abt Elektrochem, D-89069 Ulm, Germany
关键词
single-crystal electrode; capacitance; double layer; interfacial structure; tension; theory;
D O I
10.1016/S0022-0728(03)00055-X
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The potential dependence of the step line tension for electrodes in contact with an electrolyte, but without specific adsorption, is calculated by solving the Poisson-Boltzmann equation numerically. Two contributions to the potential dependence are found. A contribution arising from the step geometry is zero at the potential of zero charge (pzc) and positive for either sign of the potential. The prevailing contribution arises from the dipole moment of the charge distribution at steps. It is approximately proportional to the dipole moment and the specific surface charge, and negative for potentials positive of pzc. (C) 2003 Published by Elsevier Science B.V.
引用
收藏
页码:13 / 23
页数:11
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