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Journal article
Electrolyte cation length influences electrosorption and dynamics in porous carbon supercapacitors
Electrochimica acta, v 283(C), pp 882-893
01 Sep 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We investigate the extent to which the alkyl chain on the cation of an imidazolium-based neat room-temperature ionic liquid influences mobility and electrochemical behavior in nanoporous supercapacitors. Changing the cation chain length from an ethyl (n = 2) to a butyl (n = 4) to a hexyl (n = 6) group affects the electrolyte dynamics and their accumulation densities under dynamic charge-discharge processes. We relied on molecular dynamics (MD) computational simulations and classical density functional theory (cDFT) calculations of our system to reinforce the experimental results obtained from electrochemical measurements and quasi-elastic neutron scattering (QENS). We contrast the different dynamics of ionic liquids in bulk and confined states and demonstrate the effect of the cation dimension on resulting arrangements of positive and negative ions in pores. We correlate these fundamental properties with device performance metrics in an effort to properly tailor high-performance carbon supercapacitor electrodes with non-flammable and electrochemically stable electrolytes.
The molecular structure and dimensions of supercapacitor electrolyte ions strongly influence their orientations in pores, dynamics, and, subsequently, affect the energy and power densities of energy storage devices. [Display omitted]
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Details
- Title
- Electrolyte cation length influences electrosorption and dynamics in porous carbon supercapacitors
- Creators
- Boris Dyatkin - Department of Materials Science and Engineering, A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA, 19104, United StatesNaresh C Osti - Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United StatesAlejandro Gallegos - Department of Chemical and Environmental Engineering, University of California − Riverside, Riverside, CA, 92521, United StatesYu Zhang - Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, 37235, USAEugene Mamontov - Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United StatesPeter T Cummings - Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, 37235, USAJianzhong Wu - Department of Chemical and Environmental Engineering, University of California − Riverside, Riverside, CA, 92521, United StatesYury Gogotsi - Department of Materials Science and Engineering, A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA, 19104, United States
- Publication Details
- Electrochimica acta, v 283(C), pp 882-893
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000441077900096
- Scopus ID
- 2-s2.0-85049742516
- Other Identifier
- 991014969765704721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Electrochemistry