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Choi, Chang Hyuck [Author]; Choi, Won Seok [Author]; Jaouen, Frédéric [Author]; Kasian, Olga [Author]; Mechler, Anna K. [Author]; Sougrati, Moulay Tahar [Author]; Brüller, Sebastian [Author]; Strickland, Kara [Author]; Jia, Qingying [Author]; Mukerjee, Sanjeev [Author]; Mayrhofer, Karl J. J. [Author]

Unraveling the Nature of Sites Active toward Hydrogen Peroxide Reduction in Fe-N-C Catalysts

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  • Media type: E-Article
  • Title: Unraveling the Nature of Sites Active toward Hydrogen Peroxide Reduction in Fe-N-C Catalysts
  • Contributor: Choi, Chang Hyuck [Author]; Choi, Won Seok [Author]; Jaouen, Frédéric [Author]; Kasian, Olga [Author]; Mechler, Anna K. [Author]; Sougrati, Moulay Tahar [Author]; Brüller, Sebastian [Author]; Strickland, Kara [Author]; Jia, Qingying [Author]; Mukerjee, Sanjeev [Author]; Mayrhofer, Karl J. J. [Author]
  • Published: Wiley-VCH, 2017
  • Published in: Angewandte Chemie / International edition 56(30), 8809 - 8812 (2017). doi:10.1002/anie.201704356
  • Language: English
  • DOI: https://doi.org/10.1002/anie.201704356
  • ISSN: 0044-8249; 0570-0833; 1521-3773; 1433-7851
  • Origination:
  • Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Description: Fe-N-C catalysts with high O2 reduction performance are crucial for displacing Pt in low-temperature fuel cells. However, insufficient understanding of which reaction steps are catalyzed by what sites limits their progress. The nature of sites were investigated that are active toward H2O2 reduction, a key intermediate during indirect O2 reduction and a source of deactivation in fuel cells. Catalysts comprising different relative contents of FeNxCy moieties and Fe particles encapsulated in N-doped carbon layers (0–100 %) show that both types of sites are active, although moderately, toward H2O2 reduction. In contrast, N-doped carbons free of Fe and Fe particles exposed to the electrolyte are inactive. When catalyzing the ORR, FeNxCy moieties are more selective than Fe particles encapsulated in N-doped carbon. These novel insights offer rational approaches for more selective and therefore more durable Fe-N-C catalysts.
  • Access State: Open Access