Humidity Exposure Enhances Microscopic Mobility in a Room-Temperature Ionic Liquid in MXene

Osti, Naresh C.; Thompson, Matthew W.; Van Aken, Katherine L.; Alhabeb, Mohamed; Tyagi, Madhusudan; Keum, Jong-Kahk; Cummings, Peter T.; Gogotsi, Yury; Mamontov, Eugene

doi:10.1021/acs.jpcc.8b09677

Title: Humidity Exposure Enhances Microscopic Mobility in a Room-Temperature Ionic Liquid in MXene

Journal Article · Mon Nov 12 00:00:00 EST 2018 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.8b09677· OSTI ID:1488704

^[1];

^[2]; Van Aken, Katherine L. ^[3];

^[3]; Tyagi, Madhusudan ^[4];

^[1]; Cummings, Peter T. ^[2];

^[3];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Vanderbilt Univ., Nashville, TN (United States). Dept. of Chemical and Biomolecular Engineering
Drexel Univ., Philadelphia, PA (United States). A. J. Drexel Nanotechnology Inst., and Dept. of Materials Science and Engineering
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research

Present and future electrochemical devices employing advanced electrode and electrolyte materials are expected to operate in diverse environments, where they are exposed to variable conditions, such as changing humidity levels. Such conditions can possibly alter the microscopic mechanisms that influence the electrochemical performance. Here in this paper, using quasi-elastic neutron scattering and molecular dynamics simulations, we investigate the influence of humidity exposure on a room-temperature ionic liquid, [EMIm⁺][Tf₂N^–], in Ti₃C₂T_x MXene. Absorbed water enhances the microscopic mobility of confined [EMIm⁺][Tf₂N^–], even though the ionic liquid itself is not very hygroscopic. The absorbed water molecules predominantly reside on the termination groups of the more hydrophilic MXene layers, thereby displacing the ions from the surface and facilitating their motions in the MXene matrix.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1488704

Journal Information:: Journal of Physical Chemistry. C, Vol. 122, Issue 48; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Microscopic dynamics in room-temperature ionic liquids confined in materials for supercapacitor applications Osti, Naresh C.; Mamontov, Eugene Sustainable Energy & Fuels, Vol. 4, Issue 4 https://doi.org/10.1039/c9se00829b	journal	January 2020

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