Conductivity of Concentrated Electrolytes

Yael Avni, Ram M. Adar, David Andelman, Henri Orland

Research output: Contribution to journalArticlepeer-review

Abstract

The conductivity of ionic solutions is arguably their most important trait, being widely used in electrochemical, biochemical, and environmental applications. The Debye-Hückel-Onsager theory successfully predicts the conductivity at very low ionic concentrations of up to a few millimolars, but there is no well-established theory applicable at higher concentrations. We study the conductivity of ionic solutions using a stochastic density functional theory, paired with a modified Coulomb interaction that accounts for the hard-core repulsion between the ions. The modified potential suppresses unphysical, short-range electrostatic interactions, which are present in the Debye-Hückel-Onsager theory. Our results for the conductivity show very good agreement with experimental data up to 3 molars, without any fit parameters. We provide a compact expression for the conductivity, accompanied by a simple analytical approximation.

Original languageEnglish
Article number098002
JournalPhysical Review Letters
Volume128
Issue number9
DOIs
StatePublished - 4 Mar 2022

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