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
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.
Authors with CRIS profile
Involved external institutions
Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research
Germany (DE)
University of Montpellier / Université Montpellier
France (FR)
Gwangju Institute of Science and Technology (GIST) / 광주과학기술원
Korea, Republic of (KR)
Northeastern University
United States (USA) (US)
Germany (DE)
University of Montpellier / Université Montpellier
France (FR)
Gwangju Institute of Science and Technology (GIST) / 광주과학기술원
Korea, Republic of (KR)
Northeastern University
United States (USA) (US)
How to cite
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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