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@ARTICLE{Kennouche:838283,
author = {Kennouche, David and Fang, Qingping and Blum, Ludger and
Stolten, Detlef},
title = {{A}nalysis of the {C}athode {E}lectrical {C}ontact in
{SOFC} {S}tacks},
journal = {Journal of the Electrochemical Society},
volume = {165},
number = {9},
issn = {0013-4651},
address = {Pennington, NJ},
publisher = {Electrochemical Soc.},
reportid = {FZJ-2017-06926},
pages = {F677 - F683},
year = {2018},
abstract = {The cathode contact layer is a critical component in solid
oxide fuel cell stacks and one possible cause of
degradation. Even though this layer and its interfaces are
responsible for a large proportion of the ohmic resistance,
it is generally difficult to identify the degradation
without carrying out an autopsy of the stack. As a
non-destructive method, electrochemical impedance
spectroscopy is used in this work to investigate in-depth
the cathode contact and its evolution with the support of
distribution of relaxation time and differences in impedance
spectra analyses between 650°C and 800°C. By purposefully
building a stack with a reduced cathode contact area, the
electrochemical resistance of the contact is evaluated and
its frequency response identified. Through measurements at
various operating conditions the different peaks of the
distribution of relaxation time analysis are identified and
related to physical phenomena within the cell. These
findings are then applied to a stack with a standard contact
area in order to explain the degradation behavior observed
upon dismounting from the test bench.},
cin = {IEK-3},
ddc = {540},
cid = {I:(DE-Juel1)IEK-3-20101013},
pnm = {135 - Fuel Cells (POF3-135) / SOFC - Solid Oxide Fuel Cell
(SOFC-20140602)},
pid = {G:(DE-HGF)POF3-135 / G:(DE-Juel1)SOFC-20140602},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000440924800124},
doi = {10.1149/2.0761809jes},
url = {https://juser.fz-juelich.de/record/838283},
}