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@ARTICLE{Bauelos:187681,
author = {Bañuelos, José Leobardo and Feng, Guang and Fulvio,
Pasquale F. and Li, Song and Rother, Gernot and Arend,
Nikolas and Faraone, Antonio and Dai, Sheng and Cummings,
Peter T. and Wesolowski, David J.},
title = {{T}he influence of a hierarchical porous carbon network on
the coherent dynamics of a nanoconfined room temperature
ionic liquid: {A} neutron spin echo and atomistic simulation
investigation},
journal = {Carbon},
volume = {78},
issn = {0008-6223},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2015-01306},
pages = {415 - 427},
year = {2014},
abstract = {The molecular-scale dynamic properties of the room
temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium
bis(trifluoromethylsulfonyl)imide, or [C4mim+][Tf2N−],
confined in hierarchical microporous–mesoporous carbon,
were investigated using neutron spin echo (NSE) and
molecular dynamics (MD) simulations. Both NSE and MD reveal
pronounced slowing of the overall collective dynamics,
including the presence of an immobilized fraction of RTIL at
the pore wall, on the time scales of these approaches. A
fraction of the dynamics, corresponding to RTIL inside 0.75
nm micropores located along the mesopore surfaces, are
faster than those of RTIL in direct contact with the walls
of 5.8 nm and 7.8 nm cylindrical mesopores. This behavior is
ascribed to the near-surface confined-ion density
fluctuations resulting from the ion–ion and ion–wall
interactions between the micropores and mesopores as well as
their confinement geometries. Strong micropore–RTIL
interactions result in less-coordinated RTIL within the
micropores than in the bulk fluid. Increasing temperature
from 296 K to 353 K reduces the immobilized RTIL fraction
and results in nearly an order of magnitude increase in the
RTIL dynamics. The observed interfacial phenomena underscore
the importance of tailoring the surface properties of porous
carbons to achieve desirable electrolyte dynamic behavior,
since this impacts the performance in applications such as
electrical energy storage devices.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
ICS-1},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
pnm = {54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-Juel1)SNS-NSE-20150203},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000341463900044},
doi = {10.1016/j.carbon.2014.07.020},
url = {https://juser.fz-juelich.de/record/187681},
}