Charging dynamics of electric double layer nanocapacitors in mean-field

Charging dynamics of electric double layer nanocapacitors in mean-field

An electric double layer capacitor (EDLC) stores energy by modulating the spatial distribution of ions in the electrolytic solution that it contains. We determine the mean-field time scales for planar EDLC relaxation to equilibrium, after a potential difference is applied. We tackle first the fully...

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Bibliographic Details
Main Authors: Palaia, Ivan, Asta, Adelchi J, Warren, Patrick B, Rotenberg, Benjamin, Trizac, Emmanuel
Format: Journal Article
Language:English
Published: 02-01-2023
Subjects:
Physics - Chemical Physics
Physics - Soft Condensed Matter
Online Access:Get full text
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Summary:An electric double layer capacitor (EDLC) stores energy by modulating the spatial distribution of ions in the electrolytic solution that it contains. We determine the mean-field time scales for planar EDLC relaxation to equilibrium, after a potential difference is applied. We tackle first the fully symmetric case, where positive and negative ionic species have same valence and diffusivity, and then the general, more complex, asymmetric case. Depending on applied voltage and salt concentration, different regimes appear, revealing a remarkably rich phenomenology relevant for nanocapacitors.
DOI:10.48550/arxiv.2301.00610