Frequency-dependent conductivity of concentrated electrolytes: A stochastic density functional theory

被引:1
作者
Bonneau, Haggai [1 ]
Avni, Yael [2 ]
Andelman, David [1 ]
Orland, Henri [3 ]
机构
[1] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel
[2] Univ Chicago, James Franck Inst, 929 57th St, Chicago, IL 60637 USA
[3] Univ Paris Saclay, Inst Phys Theor, CEA, CNRS, F-91191 Gif Sur Yvette, France
基金
美国国家科学基金会; 以色列科学基金会;
关键词
CONDUCTANCE; TRANSPORT; ADSORPTION; CONSTANTS; LIQUIDS;
D O I
10.1063/5.0236073
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
The response of ionic solutions to time-varying electric fields, quantified by a frequency-dependent conductivity, is essential in many electrochemical applications. Yet, it constitutes a challenging problem due to the combined effect of Coulombic interactions, hydrodynamics, and thermal fluctuations. Here, we study the frequency-dependent conductivity of ionic solutions using a stochastic density functional theory. In the limit of small concentrations, we recover the classical Debye and Falkenhagen (DF) result, predicting an increase in conductivity with field frequency. At higher concentrations, we use a modified Coulomb interaction potential that accounts for the hard-core repulsion between the ions, which was recently employed in the zero-frequency case. Consequently, we extend the DF result to concentrated electrolytes. We discuss experimental and numerical studies and the complexity of observing the DF effect in such setups.
引用
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页数:9
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