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@ARTICLE{Kornely:15844,
author = {Kornely, M. and Neumann, A. and Menzler, N.H. and Leonide,
A. and Weber, A. and Ivers-Tiffée, E.},
title = {{D}egradation of anode supported cell ({ASC}) performance
by {C}r-poisoning},
journal = {Journal of power sources},
volume = {196},
issn = {0378-7753},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {PreJuSER-15844},
pages = {7203 - 7208},
year = {2011},
note = {Record converted from VDB: 12.11.2012},
abstract = {Performance and stability of solid oxide fuel cells (SOFC)
have been continuously improved at the single-cell level.
Connecting the individual cells by a metallic interconnector
(MIC) in a stack, though, yields remarkable losses in
performance and leads to an enhanced degradation. These
effects are attributed to, inter alia, Cr evaporation from
the MIC and, thus, Cr poisoning of the cathode.To determine
the degradation rate caused by Cr poisoning, this paper
focuses on the differences in single cell performance and
short-term stability by using either an inert flowfielcl or
a flowfield made of a chromia-forming alloy. To provide a
homogeneous current collection and gas distribution over the
complete cathode area and to avoid a direct contact between
MIC made of Crofer22APU and LSM, a platinum mesh was used as
current collector. The cell performance was evaluated by
analyzing its current-voltage characteristics and using
electrochemical impedance spectroscopy.A detailed analysis
of impedance spectra by the distribution of relaxation times
(DRT) and a subsequent Complex Nonlinear Least Squares
(CLNS) fit facilitated the separation of anodic and cathodic
polarization processes. In the presence of a chromia-forming
alloy the polarization resistance of the cathode showed a
significantly higher initial value (+64 m Omega.cm(2)) than
without and a high degradation rate of 213 mu Omega.cm(2)
h(-1) during 280 h of galvanostatic operation at 800 degrees
C. (C) 2010 Elsevier B.V. All rights reserved.},
keywords = {J (WoSType)},
cin = {IEK-1},
ddc = {620},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {Rationelle Energieumwandlung / SOFC - Solid Oxide Fuel Cell
(SOFC-20140602)},
pid = {G:(DE-Juel1)FUEK402 / G:(DE-Juel1)SOFC-20140602},
shelfmark = {Electrochemistry / Energy $\&$ Fuels},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000292661800020},
doi = {10.1016/j.jpowsour.2010.10.033},
url = {https://juser.fz-juelich.de/record/15844},
}