Diffuse-charge dynamics in electrochemical systems

被引：862

作者：

Bazant, Martin Z. ^{[1
,2
]}

Thornton, Katsuyo ^{[3
]}

Ajdari, Armand ^{[2
]}

机构：

[1] Department of Mathematics, Massachusetts Inst. of Technology, Cambridge, MA 02139, United States

[2] Lab. de Phys.-Chim. Théorique, UMR ESPCI-CNRS 7083, 10 rue Vauquelin, F-75005 Paris, France

[3] Dept. of Mat. Sci. and Engineering, Northwestern University, Evanston, IL 60208, United States

来源：

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | 2004年 / 70卷 / 2 1期

基金：

美国国家科学基金会;

关键词：

Adsorption - Approximation theory - Boundary layers - Current density - Electric field effects - Electrochemistry - Electrodes - Electrolytes - Fluid dynamics - Laplace transforms - Permittivity - Poisson equation - Polarization - Relaxation processes - Salts - Surface phenomena;

D O I：

10.1103/PhysRevE.70.021506

中图分类号：

学科分类号：

摘要：

The response of a model microelectrochemical system to a time-dependent applied voltage was analyzed for investigating the physics of diffuse-charge dynamics. At leading order, the system was found to behave like an RC circuit. As the charging process slowed down, the neutral-salt adsorption by the diffuse part of the bubble layer was found to couple to bulk diffusion. The results show that in the nonlinear regions, this effect produces bulk concentration gradients, and, at very large voltages, transient space charge.

引用

页码：021506 / 1