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  Reduced formation of peroxide and radical species stabilises iron-based hybrid catalysts in polymer electrolyte membrane fuel cells

Shin, D., Bhandari, S., Tesch, M. F., Bonke, S. A., Jaouen, F., Chabbra, S., et al. (2022). Reduced formation of peroxide and radical species stabilises iron-based hybrid catalysts in polymer electrolyte membrane fuel cells. Journal of Energy Chemistry, 65, 433-438. doi:10.1016/j.jechem.2021.05.047.

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 Creators:
Shin, Dongyoon1, Author
Bhandari, Sabita1, Author
Tesch, Marc F.1, Author
Bonke, Shannon A.1, Author
Jaouen, Frédéric2, Author
Chabbra, Sonia1, Author
Pratsch, Christoph3, Author           
Schnegg, Alexander1, Author
Mechler, Anna K.1, Author
Affiliations:
1Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34 – 36, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              
2ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France, ou_persistent22              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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 Abstract: The incorporation of Pt into an iron-nitrogen-carbon (FeNC) catalyst for the oxygen reduction reaction (ORR) was recently shown to enhance catalyst stability without Pt directly contributing to the ORR activity. However, the mechanistic origin of this stabilisation remained obscure. It is established herein with rotating ring disc experiments that the side product, H2O2, which is known to damage FeNC catalysts, is suppressed by the presence of Pt. The formation of reactive oxygen species is additionally inhibited, independent of intrinsic H2O2 formation, as determined by electron paramagnetic resonance. Transmission electron microscopy identifies an oxidised Fe-rich layer covering the Pt particles, thus explaining the inactivity of the latter towards the ORR. These insights develop understanding of FeNC degradation mechanisms during ORR catalysis, and crucially establish the required properties of a precious metal free protective catalyst to improve FeNC stability in acidic media.

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Language(s): eng - English
 Dates: 2021-01-062021-05-292021-06-212022-02
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jechem.2021.05.047
 Degree: -

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Title: Journal of Energy Chemistry
  Abbreviation : J. Energy Chem.
Source Genre: Journal
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Publ. Info: Amsterdam, The Netherlands : Elsevier BV
Pages: 6 Volume / Issue: 65 Sequence Number: - Start / End Page: 433 - 438 Identifier: ISSN: 20954956
CoNE: https://pure.mpg.de/cone/journals/resource/20954956