Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores
Abstract
Ionic liquids are composed of equal quantities of positive and negative ions. In the bulk, electrical neutrality occurs in these liquids due to Coulombic ordering, in which ion shells of alternating charge form around a central ion. Their structure under confinement is far less well understood. This hinders the widespread application of ionic liquids in technological applications. Here we use scattering experiments to resolve the structure of a widely used ionic liquid (EMI–TFSI) when it is confined inside nanoporous carbons. We show that Coulombic ordering reduces when the pores can accommodate only a single layer of ions. Instead, equally charged ion pairs are formed due to the induction of an electric potential of opposite sign in the carbon pore walls. This non-Coulombic ordering is further enhanced in the presence of an applied external electric potential. Furthermore, this finding opens the door for the design of better materials for electrochemical applications.
- Authors:
-
[6];
- Shinshu Univ., Nagano-City (Japan)
- Shinshu Univ., Nagano-City (Japan); Shinshu Univ., Matsumoto-City (Japan)
- Shinshu Univ., Matsumoto-City (Japan)
- Shinshu Univ., Nagano-City (Japan); Drexel Univ., Philadelphia, PA (United States)
- Loughborough Univ., Leicestershire (United Kingdom); The Univ. of Adelaide, South Australia (Australia)
- Sorbonne Univ., Paris (France); Reseau sur le Stockage Electrochimique de l'Energie (France)
- Univ. Paul Sabatier, Toulouse Cedex (France); Marion Technologies, Verniolle (France)
- Shinshu Univ., Nagano-City (Japan); Reseau sur le Stockage Electrochimique de l'Energie (France); Univ. Paul Sabatier, Toulouse Cedex (France)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1480605
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Materials
- Additional Journal Information:
- Journal Volume: 16; Journal Issue: 12; Journal ID: ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Futamura, Ryusuke, Iiyama, Taku, Takasaki, Yuma, Gogotsi, Yury, Biggs, Mark J., Salanne, Mathieu, Ségalini, Julie, Simon, Patrice, and Kaneko, Katsumi. Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores. United States: N. p., 2017.
Web. doi:10.1038/NMAT4974.
Futamura, Ryusuke, Iiyama, Taku, Takasaki, Yuma, Gogotsi, Yury, Biggs, Mark J., Salanne, Mathieu, Ségalini, Julie, Simon, Patrice, & Kaneko, Katsumi. Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores. United States. https://doi.org/10.1038/NMAT4974
Futamura, Ryusuke, Iiyama, Taku, Takasaki, Yuma, Gogotsi, Yury, Biggs, Mark J., Salanne, Mathieu, Ségalini, Julie, Simon, Patrice, and Kaneko, Katsumi. Mon .
"Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores". United States. https://doi.org/10.1038/NMAT4974. https://www.osti.gov/servlets/purl/1480605.
@article{osti_1480605,
title = {Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores},
author = {Futamura, Ryusuke and Iiyama, Taku and Takasaki, Yuma and Gogotsi, Yury and Biggs, Mark J. and Salanne, Mathieu and Ségalini, Julie and Simon, Patrice and Kaneko, Katsumi},
abstractNote = {Ionic liquids are composed of equal quantities of positive and negative ions. In the bulk, electrical neutrality occurs in these liquids due to Coulombic ordering, in which ion shells of alternating charge form around a central ion. Their structure under confinement is far less well understood. This hinders the widespread application of ionic liquids in technological applications. Here we use scattering experiments to resolve the structure of a widely used ionic liquid (EMI–TFSI) when it is confined inside nanoporous carbons. We show that Coulombic ordering reduces when the pores can accommodate only a single layer of ions. Instead, equally charged ion pairs are formed due to the induction of an electric potential of opposite sign in the carbon pore walls. This non-Coulombic ordering is further enhanced in the presence of an applied external electric potential. Furthermore, this finding opens the door for the design of better materials for electrochemical applications.},
doi = {10.1038/NMAT4974},
journal = {Nature Materials},
number = 12,
volume = 16,
place = {United States},
year = {Mon Sep 18 00:00:00 EDT 2017},
month = {Mon Sep 18 00:00:00 EDT 2017}
}
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