TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Weingarth, Daniel
A1  - Drumm, Robert
A1  - Foelske-Schmitz, Annette
A1  - Kötz, Rüdiger
A1  - Presser, Volker
T1  - Electrochemical in situ study of freezing and thawing of ionic liquids in carbon nanopores
JF  - Physical Chemistry Chemical Physics
N2  - 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.
Y1  - 2014
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:291:415-4905
SN  - 1463-9076
SS  - 1463-9076
U6  - https://doi.org/10.1039/c4cp02727b
DO  - https://doi.org/10.1039/c4cp02727b
VL  - 16
IS  - 39
SP  - 21219
EP  - 21224
ER  -