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Effects of Surface Transition and Adsorption on Ionic Liquid Capacitors

Chao, Huikuan and Wang, Zhen-Gang (2020) Effects of Surface Transition and Adsorption on Ionic Liquid Capacitors. Journal of Physical Chemistry Letters, 11 (5). pp. 1767-1772. ISSN 1948-7185. doi:10.1021/acs.jpclett.0c00023.

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Room-temperature ionic liquids (RTILs) are synthetic electrolytes with electrochemical stability superior to that of conventional aqueous-based electrolytes, allowing a significantly enlarged electrochemical window for application as capacitors. In this study, we propose a variant of an existing RTIL model for solvent-free RTILs, accounting for both ion–ion correlations and nonelectrostatic interactions. Using this model, we explore the phenomenon of spontaneous surface charge separation in RTIL capacitors and find that this transition is a common feature for realistic choices of the model parameters in most RTILs. In addition, we investigate the effects of asymmetric preferential ion adsorption on this charge separation transition and find that proximity of the transition in this case can result in greatly enhanced energy storage. Our work suggests that differential chemical treatment of electrodes can be a simple and useful means for optimizing energy storage in RTIL capacitors.

Item Type:Article
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URLURL TypeDescription
Chao, Huikuan0000-0001-9930-3586
Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2020 American Chemical Society. Received: January 3, 2020; Accepted: February 10, 2020; Published: February 10, 2020. The authors declare no competing financial interest.
Issue or Number:5
Record Number:CaltechAUTHORS:20200211-074528495
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Official Citation:Effects of Surface Transition and Adsorption on Ionic Liquid Capacitors. Huikuan Chao and Zhen-Gang Wang. The Journal of Physical Chemistry Letters 2020 11 (5), 1767-1772; DOI: 10.1021/acs.jpclett.0c00023
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101217
Deposited By: Tony Diaz
Deposited On:11 Feb 2020 17:13
Last Modified:16 Nov 2021 18:00

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