期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 30, 页码 8809-8812出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201704356
关键词
fuel cells; heterogeneous catalysis; hydrogen peroxide; iron; oxygen reduction reaction
资金
- MAXNET Energy
- ANR [2011 CHEX 004 01]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2017R1C1B2002918]
- U.S. Department of Energy, EERE [DE-EE-0000459]
- Alexander von Humboldt Foundation
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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