Journal article
Mixed Ionic Liquid Improves Electrolyte Dynamics in Supercapacitors
Journal of physical chemistry. C, v 122(19), pp 10476-10481
17 May 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Well-tailored mixtures of distinct ionic liquids can act as optimal electrolytes that extend the operating electrochemical window and improve charge storage density in supercapacitors. Here, we explore two room-temperature ionic liquids, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EmimTFSI) and 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF4). We study their electric double-layer behavior in the neat state and as binary mixtures on the external surfaces of onion-like carbon electrodes using quasielastic neutron scattering (QENS) and classical density functional theory techniques. Computational results reveal that a mixture with 4:1 EmimTFSI/EmimBF4 volume ratio displaces the larger [TFSI–] anions with smaller [BF4 –] ions, leading to an excess adsorption of [Emim+] cations near the electrode surface. These findings are corroborated by the manifestation of nonuniform ion diffusivity change, complementing the description of structural modifications with changing composition, from QENS measurements. Molecular-level understanding of ion packing near electrodes provides insight for design of ionic liquid formulations that enhance the performance of electrochemical energy storage devices.
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Details
- Title
- Mixed Ionic Liquid Improves Electrolyte Dynamics in Supercapacitors
- Creators
- Naresh C Osti - Neutron Scattering DivisionAlejandro Gallegos - University of CaliforniaBoris Dyatkin - Drexel UniversityJianzhong Wu - University of CaliforniaYury Gogotsi - Drexel UniversityEugene Mamontov - Neutron Scattering Division
- Publication Details
- Journal of physical chemistry. C, v 122(19), pp 10476-10481
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000432753700020
- Scopus ID
- 2-s2.0-85046448995
- Other Identifier
- 991014970030104721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology