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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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Shin, Dongyoon1, Autor
Bhandari, Sabita1, Autor
Tesch, Marc F.1, Autor
Bonke, Shannon A.1, Autor
Jaouen, Frédéric2, Autor
Chabbra, Sonia1, Autor
Pratsch, Christoph3, Autor           
Schnegg, Alexander1, Autor
Mechler, Anna K.1, Autor
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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 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2021-01-062021-05-292021-06-212022-02
 Publikationsstatus: Erschienen
 Seiten: 6
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1016/j.jechem.2021.05.047
 Art des Abschluß: -

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Titel: Journal of Energy Chemistry
  Kurztitel : J. Energy Chem.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Amsterdam, The Netherlands : Elsevier BV
Seiten: 6 Band / Heft: 65 Artikelnummer: - Start- / Endseite: 433 - 438 Identifikator: ISSN: 20954956
CoNE: https://pure.mpg.de/cone/journals/resource/20954956