Volume 124, Number 5, December 2018
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||27 December 2018|
Viscosity effects for ion transport in electrochemical systems
1 College of Science, Hunan University of Science and Engneering - Yongzhou, 4205199, China
2 Department of Physics, Hunan Normal University - Changsha, 410081, China
Received: 29 December 2017
Accepted: 18 October 2018
Ion transport in a fluid medium is often described by the Poisson-Nernst-Planck (PNP) equation, a time-dependent mean-field theory that ignores the ion excluded-volume effects and electrostatic correlations, and a number of theoretical procedures have been recently proposed to alleviate the mean-field approximation. In this work, we investigate the charging kinetics of an electric double layer (EDL) of organic electrolytes using the dynamic density functional theory (DDFT). Unlike the PNP equation, DDFT predicts a nonlinear dependence of the surface charge density on the charging voltage. For systems with low solvent viscosity, the collective behaviors caused by inertial effects lead to an oscillatory variation of the surface charge density, occurrences in the charging process of the electrochemical system. Both the strength and frequency of charge oscillation are affected by the solvent viscosity and the degree of EDL overlap.
PACS: 82.45.Gj – Electrolytes / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc. / 82.47.Uv – Electrochemical capacitors; supercapacitors
© EPLA, 2018
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