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

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

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Choi, Chang Hyuck1, 2, Autor           
Choi, Won Seok3, 4, Autor           
Kasian, Olga2, Autor           
Mechler, Anna Katharina5, 6, Autor           
Sougrati, Moulay Tahar7, Autor           
Brüller, Sebastian8, Autor           
Strickland, Kara9, 10, Autor           
Jia, Qingying11, Autor           
Mukerjee, Sanjeev9, Autor           
Mayrhofer, Karl J. J.2, 12, 13, Autor           
Jaouen, Frédéric7, Autor           
Affiliations:
1School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, South Korea, persistent22              
2Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
4Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, South Korea, ou_persistent22              
5Université de Montpellier, Institut Charles Gerhardt Montpellier, 2 place Eugène Bataillon, Montpellier, France, ou_persistent22              
6Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34–36, Mülheim a.d. Ruhr, Germany, persistent22              
7Institut Charles Gerhardt de Montpellier – UMR 5253, 2 Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, ou_persistent22              
8Université de Montpellier, Institut Charles Gerhardt Montpellier, 2 place Eugène Bataillon, Montpellier, France, persistent22              
9Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, USA, persistent22              
10Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863336              
11Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, U, persistent22              
12Helmholtz-Institute Erlangen-Nuremberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany, ou_persistent22              
13Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany , ou_persistent22              

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Schlagwörter: NITROGEN-DOPED CARBON; IRON-BASED CATALYSTS; FE-57 MOSSBAUER-SPECTROSCOPY; PEM FUEL-CELL; OXYGEN REDUCTION; METAL ELECTROCATALYST; IDENTIFICATION; COORDINATION; NANOPARTICLES; CHEMISTRY
 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2017-07-17
 Publikationsstatus: Erschienen
 Seiten: 4
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: ISI: 000405308500037
DOI: 10.1002/anie.201704356
 Art des Abschluß: -

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Titel: Angewandte Chemie International Edition
  Andere : Angew. Chem., Int. Ed.
  Andere : Angew. Chem. Int. Ed.
  Andere : Angewandte Chemie, International Edition
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Weinheim : Wiley-VCH
Seiten: - Band / Heft: 56 (30) Artikelnummer: - Start- / Endseite: 8809 - 8812 Identifikator: ISSN: 1433-7851
CoNE: https://pure.mpg.de/cone/journals/resource/1433-7851