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@ARTICLE{Park:872774,
author = {Park, Heeyong and Schleker, P. Philipp M. and Liu, Zigeng
and Kowalew, Natalia and Stamm, Teresa and Schlögl, Robert
and Eichel, Rüdiger-A. and Heumann, Saskia and Granwehr,
Josef},
title = {{I}nsights into {W}ater {I}nteraction at the {I}nterface of
{N}itrogen-{F}unctionalized {H}ydrothermal {C}arbons},
journal = {The journal of physical chemistry / C C, Nanomaterials and
interfaces},
volume = {123},
number = {41},
issn = {1932-7455},
address = {Washington, DC},
publisher = {Soc.},
reportid = {FZJ-2020-00252},
pages = {25146 - 25156},
year = {2019},
abstract = {Hydrothermal carbon (HTC) derived from biomass is a class
of cost-efficient, eco-friendly functional carbon materials
with various potential applications. In this work,
solid-state nuclear magnetic resonance (NMR), longitudinal
(T1) relaxation time, and diffusion NMR were employed to
investigate the structure and water dynamics for HTC and
nitrogen-functionalized hydrothermal carbon (N-HTC) samples
((N)-HTC). Results showed that the presence of N-functional
groups influences the water interaction with (N)-HTC more
strongly than surface area, pore size distribution, or
oxygenated functional groups. Furthermore, the degree of
water interaction can be tuned by adjusting the synthesis
temperature and the precursor ratio. Water motion was more
strongly inhibited in N-HTC than in N-free HTC, thereby
suggesting the existence of a differently structured
hydration shell around N-HTC particles. In addition, the
diffusion data of water in the N-HTC material show two
components that do not exchange on the time scale of the
experiment (tens of milliseconds), indicating a significant
fraction of slow mobile water that exists inside the
structure of N-HTC. 1H–2H isotope exchange and
cross-polarization NMR results show this internal water only
in a near-surface layer of the N-HTC particles. Based on
these findings, a model for water interaction with (N)-HTC
particles is proposed.},
cin = {IEK-9},
ddc = {530},
cid = {I:(DE-Juel1)IEK-9-20110218},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000492118400016},
doi = {10.1021/acs.jpcc.9b05323},
url = {https://juser.fz-juelich.de/record/872774},
}