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

doi:10.1021/acs.jpcc.8b09677

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

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Abstract

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 ⁺][Tf ₂N ^–], in Ti ₃C ₂T _x MXene. Absorbed water enhances the microscopic mobility of confined [EMIm ⁺][Tf ₂N ^–], 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.

Authors:

^[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

Publication Date:: 2018-11-12

Research Org.:: 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 Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)

OSTI Identifier:: 1488704

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physical Chemistry. C

Additional Journal Information:: Journal Volume: 122; Journal Issue: 48; Journal ID: ISSN 1932-7447

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Osti, Naresh C., Thompson, Matthew W., Van Aken, Katherine L., Alhabeb, Mohamed, Tyagi, Madhusudan, Keum, Jong-Kahk, Cummings, Peter T., Gogotsi, Yury, and Mamontov, Eugene. Humidity Exposure Enhances Microscopic Mobility in a Room-Temperature Ionic Liquid in MXene.  United States: N. p., 2018. 
        Web.  doi:10.1021/acs.jpcc.8b09677.

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                    Osti, Naresh C., Thompson, Matthew W., Van Aken, Katherine L., Alhabeb, Mohamed, Tyagi, Madhusudan, Keum, Jong-Kahk, Cummings, Peter T., Gogotsi, Yury, & Mamontov, Eugene. Humidity Exposure Enhances Microscopic Mobility in a Room-Temperature Ionic Liquid in MXene.  United States.  doi:10.1021/acs.jpcc.8b09677.

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                    Osti, Naresh C., Thompson, Matthew W., Van Aken, Katherine L., Alhabeb, Mohamed, Tyagi, Madhusudan, Keum, Jong-Kahk, Cummings, Peter T., Gogotsi, Yury, and Mamontov, Eugene. Mon .  
        "Humidity Exposure Enhances Microscopic Mobility in a Room-Temperature Ionic Liquid in MXene".  United States.  doi:10.1021/acs.jpcc.8b09677.  https://www.osti.gov/servlets/purl/1488704.

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@article{osti_1488704,

  title        = {Humidity Exposure Enhances Microscopic Mobility in a Room-Temperature Ionic Liquid in MXene},

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

  abstractNote = {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 Ti3C2Tx 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.},

  doi          = {10.1021/acs.jpcc.8b09677},

  journal      = {Journal of Physical Chemistry. C},

  number       = 48,

  volume       = 122,

  place        = {United States},

  year         = {2018},

  month        = {11}

}

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DOI: 10.1021/acs.jpcc.8b09677

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