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

Haggai Bonneau, Yael Avni, David Andelman*, Henri Orland

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish
Article number244501
JournalJournal of Chemical Physics
Volume161
Issue number24
DOIs
StatePublished - 28 Dec 2024

Funding

FundersFunder number
National Natural Science Foundation of China
NSFC-ISF
Israel Science Foundation226/24, 3396/19, 213/19

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