Feeling your neighbors across the walls: How interpore ionic interactions affect capacitive energy storage.
File(s)
Accepted version
Author(s)
Kondrat, Svyatoslav
Vasilyev, Oleg A
Kornyshev, Alexei A
Type
Journal Article
Abstract
Progress in low-dimensional carbon materials has intensified research on supercapacitors with nanostructured/nanoporous electrodes. The theoretical and simulation work so far has focused on charging single nanopores or nanoporous networks and the effects due to ionic interactions inside the pores, while the effect of interpore ion-ion correlations has received less attention. Herein, we study how the interactions between the ions in the neighboring pores across the pore walls affect capacitive energy storage. We develop a simple lattice model for the ions in a stack of parallel-aligned nanotubes, solve it by using the perturbation and "semi-mean-field" theories, and test the results by Monte Carlo simulations. We demonstrate that the interpore ionic interactions can have a profound effect on charge storage; in particular, such interactions can enhance or diminish the stored energy density, depending on the sign of like-charge interactions. We also find that charging can proceed either continuously or via a phase transition. Our results call for more detailed investigations of the properties of carbon pore walls and suggest that tuning their electrostatic response may be promising for the rational design of an optimal supercapacitor.
Date Issued
2019-07-18
Date Acceptance
2019-07-18
Citation
Journal of Physical Chemistry Letters, 2019, 10, pp.4523-4527
ISSN
1948-7185
Publisher
American Chemical Society
Start Page
4523
End Page
4527
Journal / Book Title
Journal of Physical Chemistry Letters
Volume
10
Copyright Statement
© 2019 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpclett.9b01623
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/31318564
Grant Number
EP/H004319/1
Subjects
03 Chemical Sciences
02 Physical Sciences
Publication Status
Published online
Coverage Spatial
United States
Date Publish Online
2019-07-18