Journal article
Cation Molecular Structure Affects Mobility and Transport of Electrolytes in Porous Carbons
Journal of the Electrochemical Society, v 166(4), pp A507-A514
Jan 2019
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We examined the electrosorption and ion dynamics of imidazolium-based room temperature ionic liquids (RTILs) having short (3-carbon, C3mim+) and long (12-carbon, C12mim+) cations, that is, 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C3mimTFSI) and 1-dodecyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C12mimTFSI), confined in ordered mesoporous carbon (OMC) and analyzed the influence of the cation alkyl chain length on the ion dynamics and the capacitive behavior using electrochemical measurements together with quasi-elastic neutron scattering (QENS) observations and classical density functional theory (cDFT) computations. Electrochemical tests highlighted the significant influence of specific applied potentials on accumulated charge storage densities and on the limits of saturation of larger electrolytes in the pores. Computational analyses corroborated these findings and predicted a 16% increase in the capacitance of the smaller-cation electrolyte under high applied potentials. However, QENS experiments revealed a behavior of decoupling of alkyl chain dynamics from the ring in electrolytes with larger ions. cDFT calculations identified density spikes for C12mim+ away from the pore walls to further corroborate this unique behavior. Our insights into chain length-dependent dynamics and electrosorption in complex electrolyte-electrode systems deepen fundamental understanding of confined RTIL electrolyte behavior in the porous carbon electrodes.
Metrics
Details
- Title
- Cation Molecular Structure Affects Mobility and Transport of Electrolytes in Porous Carbons
- Creators
- Naresh C Osti - Oak Ridge National Laboratory Neutron Scattering Division, , USABoris Dyatkin - Drexel University Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, , USAAlejandro Gallegos - University of California-Riverside Department of Chemical and Environmental Engineering, , USADavid Voneshen - STFC Rutherford Appleton Laboratory ISIS Pulsed Neutron and Muon Source, , United KingdomJong K Keum - Oak Ridge National Laboratory Neutron Scattering Division, , USAKen Littrell - Oak Ridge National Laboratory Neutron Scattering Division, , USAPengfei Zhang - Oak Ridge National Laboratory Chemical Science Division, , USASheng Dai - Oak Ridge National Laboratory Chemical Science Division, , USAJianzhong Wu - University of California-Riverside Department of Chemical and Environmental Engineering, , USAYury Gogotsi - Drexel University Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, , USAEugene Mamontov - Oak Ridge National Laboratory Neutron Scattering Division, , USA
- Publication Details
- Journal of the Electrochemical Society, v 166(4), pp A507-A514
- Publisher
- The Electrochemical Society
- Number of pages
- 8
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000458657700001
- Scopus ID
- 2-s2.0-85063096930
- Other Identifier
- 991014970032704721
UN Sustainable Development Goals (SDGs)
This publication has contributed to the advancement of the following goals:
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Electrochemistry
- Materials Science, Coatings & Films