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research-article

Ion storage in nano-confined interstices between vertically aligned nanotubes in electric double-layer capacitors

[+] Author and Article Information
Aniruddha M. Dive

School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164-2920, U.S.A.
aniruddha.dive@wsu.edu

Dr. Soumik Banerjee

School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164-2920, U.S.A.
soumik.banerjee@wsu.edu

1Corresponding author.

ASME doi:10.1115/1.4037582 History: Received May 31, 2017; Revised August 10, 2017

Abstract

Ionic liquids are considered promising electrolytes for developing electric double-layer capacitors with high energy density. To identify optimal operating conditions, we performed molecular dynamics simulations of N-methyl-N-propyl pyrrolidinium bis(trifluoromethanesulfonyl)imide (mppy+ T¬¬FSI-) ionic liquid confined in the interstices of vertically aligned carbon nanostructures mimicking the electrode structure. We modelled various surface charge densities as well as varied the distance between nanotubes in the array. Our results indicate that high-density ion storage occurs within the non-interacting double-layer region formed in the nano-confined domain between charged nanotubes. We determined the specific arrangement of these ions relative to the nanotube surface and related the layered configuration to the molecular structure of the ions. The pitch distance of the nanotube array that enables optimal mppy+ T¬¬FSI- storage and enhanced capacitance is determined to be 16 Å.

Copyright (c) 2017 by ASME
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