Abstract
In search for the origin of irreversible ion immobilization under applied electric potential recently reported for a prototypical room-temperature ionic liquid electrolyte, [emim][Tf2N], confined in 1.5 nm carbon pores, here we compare the microscopic dynamics of cations in [emim][Tf2N] in the 1.5 nm and 6.7 nm carbon pores; in the latter, ion immobilization under applied electric potential is reversible. Using quasielastic neutron scattering, we find that the cation translational diffusivity is reasonably well defined on at least a nanometer length scale in the 6.7 nm pores, but not the 1.5 nm pores. Severely impeded microscopic dynamics of the confined electrolyte may be one of the factors differentiating the 1.5 nm pores from their larger counterparts and contributing to the irreversible immobilization of ions under applied electric potential.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the Joint Conference on Quasielastic Neutron Scattering and the Workshop on Inelastic Spectrometers, QENS/WINS 2016 |
| Subtitle of host publication | Probing Nanoscale Dynamics in Energy Related Materials |
| Editors | Astrid Schneidewind, Veronika Grzimek, David L. Price, Felix Fernandez-Alonso, Wiebke Lohstroh, Margarita Russina |
| Publisher | American Institute of Physics Inc. |
| ISBN (Electronic) | 9780735416765 |
| DOIs | |
| State | Published - May 31 2018 |
| Event | Joint International Conference on 12th Quasielastic Neutron Scattering and the 7th Workshop on Inelastic Spectrometers: Probing Nanoscale Dynamics in Energy Related Materials, QENS/WINS 2016 - Potsdam, Germany Duration: Sep 5 2016 → Sep 9 2016 |
Publication series
| Name | AIP Conference Proceedings |
|---|---|
| Volume | 1969 |
| ISSN (Print) | 0094-243X |
| ISSN (Electronic) | 1551-7616 |
Conference
| Conference | Joint International Conference on 12th Quasielastic Neutron Scattering and the 7th Workshop on Inelastic Spectrometers: Probing Nanoscale Dynamics in Energy Related Materials, QENS/WINS 2016 |
|---|---|
| Country/Territory | Germany |
| City | Potsdam |
| Period | 09/5/16 → 09/9/16 |
Funding
This work was supported as part of the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. The neutron scattering experiments at Oak Ridge National Laboratory’s (ORNL) Spallation Neutron Source were supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).