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@ARTICLE{Wippermann:872763,
author = {Wippermann, Klaus and Suo, Yanpeng and Korte, Carsten},
title = {{S}uitability of the anging meniscus {RDE} for the
electrochemical investigation of ionic liquids},
journal = {Journal of the Electrochemical Society},
volume = {167},
number = {4},
issn = {0013-4651},
address = {Pennington, NJ},
publisher = {Electrochemical Soc.},
reportid = {FZJ-2020-00241},
pages = {046511},
year = {2020},
abstract = {Employing the oxygen reduction reaction (ORR) exemplarily,
the suitability of the hanging meniscus RDE (HMRDE)
technique for viscous electrolytes—in particular for ionic
liquids—was examined. RDE and HMRDE experiments were
carried out using polycrystalline Pt disks in contact with
either concentrated phosphoric acid,
N,N-diethylmethylammoniumtriflate ([Dema][TfO]) or
2-sulfoethylmethyl-ammoniumtriflate ([2-Sema][TfO]). RDE
measurements revealed Levich factors of the oxygen transport
close to the theoretical value, even if the thickness of the
hydrodynamic layer was about ⅔ of the disk diameter. HMRDE
experiments showed a pronounced scattering of the Levich
factors, which means a significant error in the
determination of the mass transport parameters. In contrast,
reliable Tafel factors of ORR were obtained from HMRDE
experiments with viscous mixtures of [2-Sema][TfO] and
water. The thickness of the perturbed layer δ pl near the
edge of the HMRDE was found to be virtually independent of
the viscosity of the respective electrolyte. In the case of
viscous electrolytes like ionic liquids, the HMRDE technique
is particularly suitable for investigating the kinetic
parameters of electrochemical processes at elevated
temperatures >100 °C, whereas a more precise determination
of mass transport properties will only be possible once the
experimental error can be significantly reduced.},
cin = {IEK-14},
ddc = {660},
cid = {I:(DE-Juel1)IEK-14-20191129},
pnm = {135 - Fuel Cells (POF3-135)},
pid = {G:(DE-HGF)POF3-135},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000518538300002},
doi = {10.1149/1945-7111/ab75f9},
url = {https://juser.fz-juelich.de/record/872763},
}