<div class="csl-bib-body">
<div class="csl-entry">Baumann, F. S., Fleig, J., Konuma, M., Starke, U., Habermeier, H.-U., & Maier, J. (2005). Strong Performance Improvement of La0.6Sr0.4Co0.8Fe0.2O3-δ SOFC Cathodes by Electrochemical Activation. <i>Journal of The Electrochemical Society</i>, <i>152</i>(10), A2074. https://doi.org/10.1149/1.2034529</div>
</div>
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dc.identifier.issn
0013-4651
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/172957
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dc.description.abstract
It is shown that the electrochemical resistance of mixed conducting solid oxide fuel cell (SOFC) model cathodes can be reduced drastically by a short but strong dc polarization of the cell. The samples investigated are dense thin-film microelectrodes of La0.6Sr0.4Co0.8Fe0.2O3- on a yttria-stabilized zirconia solid electrolyte. Relative performance improvements of more than two orders of magnitude can be achieved with a cathodic dc bias of the order of 1 V, applied for a few minutes at fuel cell operating temperature. The positive effect on the electrode performance corresponds to an acceleration of the oxygen surface exchange reaction, initially the resistance determining process. For this surface-related resistance, absolute values as low as 0.065 cm2 at 700°C have been obtained. After such an activation, the resistance slowly increases again on a much larger time scale, indicating the possibility of a steady performance enhancement by a periodic activation with short dc pulses. X-ray photoelectron spectra show that a strong cathodic polarization severely changes the cation concentrations within the outermost surface layer of the electrode, and these field-induced surface compositional changes are assumed to be the main cause of the performance improvement.
en
dc.language.iso
en
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dc.publisher
IOP
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dc.relation.ispartof
Journal of The Electrochemical Society
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dc.subject
Condensed Matter Physics
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dc.subject
Electronic, Optical and Magnetic Materials
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dc.subject
Renewable Energy, Sustainability and the Environment
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dc.subject
Surfaces, Coatings and Films
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dc.subject
Materials Chemistry
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dc.subject
Electrochemistry
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dc.title
Strong Performance Improvement of La0.6Sr0.4Co0.8Fe0.2O3-δ SOFC Cathodes by Electrochemical Activation
en
dc.type
Artikel
de
dc.type
Article
en
dc.description.startpage
A2074
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dc.type.category
Original Research Article
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tuw.container.volume
152
-
tuw.container.issue
10
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tuw.journal.peerreviewed
true
-
tuw.peerreviewed
true
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dcterms.isPartOf.title
Journal of The Electrochemical Society
-
tuw.publication.orgunit
E164 - Institut für Chemische Technologien und Analytik
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tuw.publisher.doi
10.1149/1.2034529
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dc.identifier.eissn
1945-7111
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dc.identifier.libraryid
AC05937276
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dc.description.numberOfPages
6
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tuw.author.orcid
0000-0002-8401-6717
-
wb.sci
true
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wb.sciencebranch
Chemie
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wb.sciencebranch.oefos
13
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no Fulltext
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Publications
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Publications
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item.languageiso639-1
en
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item.openairetype
Artikel
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item.openairetype
Article
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http://purl.org/coar/resource_type/c_18cf
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http://purl.org/coar/resource_type/c_18cf
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none
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E164 - Institut für Chemische Technologien und Analytik