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Electrochemical in situ study of freezing and thawing of ionic liquids in carbon nanopores

  • Room temperature ionic liquids (RTIL) are an emerging class of electrolytes enabling high cell voltages and, in return, high energy density of advanced supercapacitors. Yet, the low temperature behavior, including freezing and thawing, is little understood when confined in the narrow space of nanopores. This study shows that RTILs may show a tremendously different thermal behavior when comparing bulk with nanoconfined properties as a result of the increased surface energy of carbon pore walls. In particular, continuous increase in viscosity is accompanied with slowed-down charge/discharge kinetics during in-situ electrochemical characterization. Freezing reversibly collapses the energy storage ability - while thawing fully restores the initial energy density of the material. For the first time, a different thermal behavior in positively and negatively polarized electrodes is demonstrated. This leads to different freezing and melting points in the two electrodes. Compared to bulk, RTIL in the confinement of electrically charged nanopores, shows the unique behavior of being highly affine for supercooling; that is, the electrode freezing during heating.

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Document Type:Article
Author:Daniel Weingarth, Robert Drumm, Annette Foelske-SchmitzORCiD, Rüdiger Kötz, Volker PresserORCiD
Parent Title (English):Physical Chemistry Chemical Physics
First Page:21219
Last Page:21224
Year of first Publication:2014
Release Date:2022/11/18
Impact:04.493 (2014)
Funding Information:BMBF nanoEES3D project award number 03EK3013
Open Access:Open Access
Signature:INM 2014/70
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International