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Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores

Futamura, Ryusuke and Iiyama, Taku and Takasaki, Yuma and Gogotsi, Yury and Biggs, Mark J. and Salanne, Mathieu and Segalini, Julie and Simon, Patrice and Kaneko, Katsumi Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores. (2017) Nature Materials, 16 (12). 1225-1232. ISSN 1476-1122

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Official URL: https://doi.org/10.1038/NMAT4974

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. This finding opens the door for the design of better materials for electrochemical applications.

Item Type:Article
HAL Id:hal-02048141
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Collège de France (FRANCE)
Other partners > Drexel University (USA)
Other partners > Ecole Nationale Supérieure de Chimie de Paris - ENSCP (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
Other partners > Sorbonne Université (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Nantes (FRANCE)
Other partners > Université de Picardie Jules Verne (FRANCE)
Other partners > University of Adelaïde (AUSTRALIA)
Other partners > Loughborough University (UNITED KINGDOM)
Other partners > Shinshu University (JAPAN)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
Other partners > Université de Haute Alsace - UHA (FRANCE)
Other partners > Université de Montpellier (FRANCE)
Laboratory name:
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Deposited By: cirimat webmestre
Deposited On:25 Feb 2019 12:56

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