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  Degradation of Fe/N/C catalysts upon high polarization in acid medium

Goellner, V., Baldizzone, C., Schuppert, A. K., Sougrati, M. T., Mayrhofer, K. J. J., & Jaouen, F. (2014). Degradation of Fe/N/C catalysts upon high polarization in acid medium. Physical Chemistry Chemical Physics, 16(34), 18454-18462. doi:10.1039/c4cp02882a.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-CB45-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-D286-5
Genre: Journal Article

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 Creators:
Goellner, Vincent1, Author              
Baldizzone, Claudio2, Author              
Schuppert, Anna Katharina2, Author              
Sougrati, Moulay Tahar1, Author              
Mayrhofer, Karl Johann Jakob2, Author              
Jaouen, Frédéric1, Author              
Affiliations:
1Institut Charles Gerhardt de Montpellier – UMR 5253, 2 Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, ou_persistent22              
2Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              

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Free keywords: Membrane Fuel-Cells; Oxygen Reduction Reaction; Carbon Corrosion; Iron Phthalocyanine; Cathode Catalysts; Electrocatalysts; Surface; Polyaniline; Performance; Stability; Chemistry; Physics;
 Abstract: A comprehensive study of the degradation of a highly active Fe/N/C catalyst in acid medium is reported. An accelerated aging protocol was applied in the temperature range of 20 to 80 degrees C. From fundamental rotating-disc electrode studies and polymer electrolyte membrane fuel cell investigations combined with identical-location electron microscopy and Mossbauer spectroscopy at various stages of degradation, important insights into the structural and chemical changes of the catalyst were obtained. Most importantly, the degradation is strongly enhanced at elevated temperature, which is correlated to (i) increased carbon-corrosion rate and (ii) parallel non-preferential dissolution of the FeNx-based active sites. The degradation not only leads to a decreased ORR kinetics over time but also induces significant charge- and mass-transport resistances due to the collapse of the electrode structure.

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Language(s): eng - English
 Dates: 2014-07-172014-09-14
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000341064600048
DOI: 10.1039/c4cp02882a
 Degree: -

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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: 16 (34) Sequence Number: - Start / End Page: 18454 - 18462 Identifier: ISSN: 1463-9076
CoNE: /journals/resource/954925272413_1