Dynamics of a room temperature ionic liquid under applied pressure

Osti, Naresh C.; Haberl, Bianca; Jalarvo, Niina H.; Boehler, Reinhard; Molaison, Jamie J.; Goyette, Rick J.; Mamontov, Eugene

doi:10.1016/j.chemphys.2019.110628

Title: Dynamics of a room temperature ionic liquid under applied pressure

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Abstract

We report that room temperature ionic liquids (RTILs) have shown great potential in a wide range of applications, especially as novel electrolytes for energy generation. Understanding microscopic dynamics under variable environmental conditions provides critical knowledge of the microscopic interactions in RTILs, which are closely linked to their functionality. Here, we investigate a response of a RTIL, EmimTFSI, to application of a high pressure, up to 1.0 GPa, using quasi-elastic neutron scattering, Raman and X-ray scattering. The ionic liquid transitions from a liquid to a solid state at above ~0.5 GPa and returns to its liquid state following full decompression. However, following such pressure application, the resulting liquid no longer possesses either cations, or anions, as individual entities, as evident from quasi-elastic scattering and Raman scattering results, respectively. We suggest that a possible cause for this behavior could be dimerization of ions, which needs to be considered when designing RTILs for moderate high-pressure applications.

Authors:

^[1];

^[2]; Boehler, Reinhard ^[3];

^[1]; Goyette, Rick J. ^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Juelich Center for Neutron Scattering (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Carnegie Inst. for Sciences, Washington, DC (United States)

Publication Date:: Fri Nov 15 00:00:00 EST 2019

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1607280

Alternate Identifier(s):: OSTI ID: 1702179

Grant/Contract Number:: AC05-00OR22725; NA0001974; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Chemical Physics

Additional Journal Information:: Journal Volume: 530; Journal Issue: C; Journal ID: ISSN 0301-0104

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

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                    Osti, Naresh C., Haberl, Bianca, Jalarvo, Niina H., Boehler, Reinhard, Molaison, Jamie J., Goyette, Rick J., and Mamontov, Eugene. Dynamics of a room temperature ionic liquid under applied pressure.  United States: N. p., 2019. 
Web.  doi:10.1016/j.chemphys.2019.110628.

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                    Osti, Naresh C., Haberl, Bianca, Jalarvo, Niina H., Boehler, Reinhard, Molaison, Jamie J., Goyette, Rick J., & Mamontov, Eugene. Dynamics of a room temperature ionic liquid under applied pressure.  United States.  https://doi.org/10.1016/j.chemphys.2019.110628

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                    Osti, Naresh C., Haberl, Bianca, Jalarvo, Niina H., Boehler, Reinhard, Molaison, Jamie J., Goyette, Rick J., and Mamontov, Eugene. Fri .  
"Dynamics of a room temperature ionic liquid under applied pressure".  United States.  https://doi.org/10.1016/j.chemphys.2019.110628.  https://www.osti.gov/servlets/purl/1607280.

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@article{osti_1607280,

  title        = {Dynamics of a room temperature ionic liquid under applied pressure},

  author       = {Osti, Naresh C. and Haberl, Bianca and Jalarvo, Niina H. and Boehler, Reinhard and Molaison, Jamie J. and Goyette, Rick J. and Mamontov, Eugene},

  abstractNote = {We report that room temperature ionic liquids (RTILs) have shown great potential in a wide range of applications, especially as novel electrolytes for energy generation. Understanding microscopic dynamics under variable environmental conditions provides critical knowledge of the microscopic interactions in RTILs, which are closely linked to their functionality. Here, we investigate a response of a RTIL, EmimTFSI, to application of a high pressure, up to 1.0 GPa, using quasi-elastic neutron scattering, Raman and X-ray scattering. The ionic liquid transitions from a liquid to a solid state at above ~0.5 GPa and returns to its liquid state following full decompression. However, following such pressure application, the resulting liquid no longer possesses either cations, or anions, as individual entities, as evident from quasi-elastic scattering and Raman scattering results, respectively. We suggest that a possible cause for this behavior could be dimerization of ions, which needs to be considered when designing RTILs for moderate high-pressure applications.},

  doi          = {10.1016/j.chemphys.2019.110628},

  journal      = {Chemical Physics},

  number       = C,

  volume       = 530,

  place        = {United States},

  year         = {Fri Nov 15 00:00:00 EST 2019},

  month        = {Fri Nov 15 00:00:00 EST 2019}

}

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