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Hollow Spheres of Iron Carbide Nanoparticles Encased in Graphitic Layers as Oxygen Reduction Catalysts

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Authors:
  • Hu, Yang ;
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    Orcid logo0000-0001-8644-9615
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Jensen, Jens Oluf ;
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    Orcid logo0000-0002-2427-7763
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Zhang, Wei ;
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    Department of Energy Conversion and Storage, Technical University of Denmark
  • Cleemann, Lars Nilausen ;
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    Orcid logo0000-0001-5840-7477
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Xing, Wei ;
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    Chinese Academy of Sciences
  • Bjerrum, Niels J. ;
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    Orcid logo0000-0001-7241-4091
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Li, Qingfeng
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    Orcid logo0000-0002-5460-055X
    Department of Energy Conversion and Storage, Technical University of Denmark
DOI:
10.1002/anie.201400358
Abstract:
Nonprecious metal catalysts for the oxygen reduction reaction are the ultimate materials and the foremost subject for low‐temperature fuel cells. A novel type of catalysts prepared by high‐pressure pyrolysis is reported. The catalyst is featured by hollow spherical morphologies consisting of uniform iron carbide (Fe3C) nanoparticles encased by graphitic layers, with little surface nitrogen or metallic functionalities. In acidic media the outer graphitic layers stabilize the carbide nanoparticles without depriving them of their catalytic activity towards the oxygen reduction reaction (ORR). As a result the catalyst is highly active and stable in both acid and alkaline electrolytes. The synthetic approach, the carbide‐based catalyst, the structure of the catalysts, and the proposed mechanism open new avenues for the development of ORR catalysts.
Type:
Journal article
Language:
English
Published in:
Angewandte Chemie International Edition, 2014, Vol 53, Issue 14
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
260911288

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