Journal article
Effect of cation on diffusion coefficient of ionic liquids at onion-like carbon electrodes
Journal of physics. Condensed matter, v 26(28), pp 284104-284104
12 Jun 2014
PMID: 24920163
Abstract
While most supercapacitors are limited in their performance by the stability of the electrolyte, using neat ionic liquids (ILs) as the electrolyte can expand the voltage window and temperature range of operation. In this study, ILs with bis(trifluoromethylsulfonyl)imide (Tf2N) as the anion were investigated as the electrolyte in onion-like carbon-based electrochemical capacitors. To probe the influence of cations on the electrochemical performance of supercapacitors, three different cations were used: 1-ethyl-3-methylimidazolium, 1-hexyl-3-methylimidazolium and 1,6-bis(3-methylimidazolium-1-yl). A series of electrochemical characterization tests was performed using cyclic voltammetry (CV), galvanostatic cycling and electrochemical impedance spectroscopy (EIS). Diffusion coefficients were measured using EIS and correlated with quasielastic neutron scattering and molecular dynamics simulation. These three techniques were used in parallel to confirm a consistent trend between the three ILs. It was found that the IL with the smaller sized cation had a larger diffusion coefficient, leading to a higher capacitance at faster charge-discharge rates. Furthermore, the IL electrolyte performance was correlated with increasing temperature, which limited the voltage stability window and led to the formation of a solid electrolyte interphase on the carbon electrode surface, evident in both the CV and EIS experiments.
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Details
- Title
- Effect of cation on diffusion coefficient of ionic liquids at onion-like carbon electrodes
- Creators
- Katherine L Van Aken - Department of Materials Science and Engineering & A J Drexel Nanomaterialstechnology Institute, Drexel University , Philadelphia, PA 19104, USAJohn K McDonough - Department of Materials Science and Engineering & A J Drexel Nanomaterialstechnology Institute, Drexel University , Philadelphia, PA 19104, USASong Li - Vanderbilt University Department of Chemical and Biomolecular Engineering, Nashville, TN 37235, USAGuang Feng - Vanderbilt University Department of Chemical and Biomolecular Engineering, Nashville, TN 37235, USASuresh M Chathoth - City University of Hong Kong Department of Physics and Materials Science, Hong Kong, ChinaEugene Mamontov - Oak Ridge National Laboratory Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge, TN 37831, USAPasquale F Fulvio - Oak Ridge National Laboratory Chemical Science Division, Oak Ridge, TN 37831, USAPeter T Cummings - Vanderbilt University Department of Chemical and Biomolecular Engineering, Nashville, TN 37235, USASheng Dai - Oak Ridge National Laboratory Chemical Science Division, Oak Ridge, TN 37831, USAYury Gogotsi - Department of Materials Science and Engineering & A J Drexel Nanomaterialstechnology Institute, Drexel University , Philadelphia, PA 19104, USA
- Publication Details
- Journal of physics. Condensed matter, v 26(28), pp 284104-284104
- Publisher
- IOP Publishing
- Number of pages
- 10
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000338830300005
- Scopus ID
- 2-s2.0-84902957578
- Other Identifier
- 991014877717404721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Condensed Matter