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28 March 2024
 
  » arxiv » 1308.5495

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Influence of solvation on the structural and capacitive properties of electrical double layer capacitors
Céline Merlet ; Mathieu Salanne ; Benjamin Rotenberg ; Paul A Madden ;
Date 26 Aug 2013
AbstractWe use molecular dynamics simulations to explore the impact of a non-ionic solvent on the structural and capacitive properties of supercapacitors based on an ionic liquid electrolyte and carbon electrodes. The study is focused on two pure ionic liquids, namely 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium tetrafluoroborate, and their 1.5 M solutions in acetonitrile. The electrolytes, represented by coarse-grained models, are enclosed between graphite electrodes. We employ a constant potential methodology which allows us to gain insight into the influence of solvation on the polarization of the electrodes as well as the structural and capacitive properties of the electrolytes at the interface. We show that the interfacial characteristics, different for two distinct pure ionic liquids, become very similar upon mixing with acetonitrile.
Source arXiv, 1308.5495
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