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

Choi, Chang Hyuck; Choi, Won Seok; Kasian, Olga; Mechler, Anna Katharina; Sougrati, Moulay Tahar; Bruller, Sebastian; Strickland, Kara; Jia, Qingying; Mukerjee, Sanjeev; Mayrhofer, Karl J. J.; Jaouen, Frederic

doi:10.1002/anie.201704356

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

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Mechler, Anna Katharina
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Choi, C. H., Choi, W. S., Kasian, O., Mechler, A. K., Sougrati, M. T., Bruller, S., et al. (2017). Unraveling the Nature of Sites Active toward Hydrogen Peroxide Reduction in Fe-N-C Catalysts. Angewandte Chemie, International Edition in English, 56(30), 8809-8812. doi:10.1002/anie.201704356.

Cite as: https://hdl.handle.net/21.11116/0000-0006-E1D2-E

Abstract

Fe-N-C catalysts with high O-2 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 O-2 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.