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  The Chemical Evolution of the La0.6Sr0.4CoO3−δ Surface Under SOFC Operating Conditions and Its Implications for Electrochemical Oxygen Exchange Activity

Opitz, A. K., Rameshan, C., Kubicek, M., Rupp, G. M., Nenning, A., Götsch, T., et al. (2018). The Chemical Evolution of the La0.6Sr0.4CoO3−δ Surface Under SOFC Operating Conditions and Its Implications for Electrochemical Oxygen Exchange Activity. Topics in Catalysis, 61(20), 2129-2141. doi:10.1007/s11244-018-1068-1.

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Opitz2018_Article_TheChemicalEvolutionOfTheLa06S.pdf (Publisher version), 3MB
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Opitz2018_Article_TheChemicalEvolutionOfTheLa06S.pdf
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 Creators:
Opitz, Alexander K.1, Author
Rameshan, Christoph2, Author
Kubicek, Markus1, Author
Rupp, Ghislain M.1, Author
Nenning, Andreas1, 3, Author
Götsch, Thomas4, Author
Blume, Raoul5, Author              
Hävecker, Michael5, Author              
Knop-Gericke, Axel5, 6, Author              
Rupprechter, Günther2, Author
Klötzer, Bernhard4, Author
Fleig, Jürgen1, Author
Affiliations:
1Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria, ou_persistent22              
2Institute of Materials Chemistry, Vienna University of Technology, Vienna, Austria, ou_persistent22              
3Department of Materials Science and Engineering, MIT, 77 Massachusetts Avenue, 02139 Cambridge, MA, USA, ou_persistent22              
4Institute of Physical Chemistry, University of Innsbruck, Innrain 52c, 6020 Innsbruck, Austria, ou_persistent22              
5Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
6Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45413 Mülheim, Germany, ou_persistent22              

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 Abstract: Owing to its extraordinary high activity for catalysing the oxygen exchange reaction, strontium doped LaCoO3 (LSC) is one of the most promising materials for solid oxide fuel cell (SOFC) cathodes. However, under SOFC operating conditions this material suffers from performance degradation. This loss of electrochemical activity has been extensively studied in the past and an accumulation of strontium at the LSC surface has been shown to be responsible for most of the degradation effects. The present study sheds further light onto LSC surface changes also occurring under SOFC operating conditions. In-situ near ambient pressure X-ray photoelectron spectroscopy measurements were conducted at temperatures between 400 and 790 °C. Simultaneously, electrochemical impedance measurements were performed to characterise the catalytic activity of the LSC electrode surface for O2 reduction. This combination allowed a correlation of the loss in electro-catalytic activity with the appearance of an additional La-containing Sr-oxide species at the LSC surface. This additional Sr-oxide species preferentially covers electrochemically active Co sites at the surface, and thus very effectively decreases the oxygen exchange performance of LSC. Formation of precipitates, in contrast, was found to play a less important role for the electrochemical degradation of LSC.

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Language(s): eng - English
 Dates: 2018-10-202018-12
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s11244-018-1068-1
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Title: Topics in Catalysis
  Other : Top. Catal.
Source Genre: Journal
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Publ. Info: New York : Springer
Pages: 13 Volume / Issue: 61 (20) Sequence Number: - Start / End Page: 2129 - 2141 Identifier: ISSN: 1022-5528
CoNE: https://pure.mpg.de/cone/journals/resource/954925584249