期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 496, 期 -, 页码 531-539出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.02.043
关键词
Finite ion size; Ion permittivity effect; Electric double layer; Differential capacitance; Carnahan-Starling equation
资金
- Ministerio de Economia y Competitividad [FIS2013-47666-C3-2-R]
- Junta de Andalucia [PE-2012 FQM-694]
- Universidad de Jaen y Caja Rural de Jaen of Spain [UJA2015/06/23]
- PIUNT of Argentina [E/535]
A full theoretical account of the differential capacitance of the diffuse part of the electric double layer at electrode-electrolyte solution interfaces is presented. It builds upon the standard electrokinetic model adding all the additional effects related to the finite ionic size. This includes steric interactions among ions by means of either the Bikerman or Carnahan-Starling expressions and all the permittivity related effects that arise when ions are represented as dielectric spheres. These include the solution permittivity dependence on the local ionic concentration, calculated by means of the Maxwell mixture formula, and two additional forces acting on the ions, namely the Born and the dielectrophoretic forces that depend on the permittivity and the electric field gradients, respectively. The obtained results show that the diffuse double layer behavior is sufficient to qualitatively account for the observed differential capacitance dependence on the electrode voltage. Moreover, when combined with an inner layer capacitance and using the Carnahan-Starling expression, a remarkably good quantitative agreement is achieved. (C) 2017 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据