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

Choi CH, Choi WS, Kasian O, Mechler AK, Sougrati MT, Bruller S, Strickland K, Jia Q, Mukerjee S, Mayrhofer K, Jaouen F (2017)


Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Publisher: WILEY-V C H VERLAG GMBH

Book Volume: 56

Pages Range: 8809-8812

Journal Issue: 30

DOI: 10.1002/anie.201704356

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.

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APA:

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

MLA:

Choi, Chang Hyuck, et al. "Unraveling the Nature of Sites Active toward Hydrogen Peroxide Reduction in Fe-N-C Catalysts." Angewandte Chemie International Edition 56.30 (2017): 8809-8812.

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