Nitrogen-doped Carbon Nanofibers for the Oxygen Reduction Reaction: Importance of the Iron Growth Catalyst Phase

Research output: Contribution to journalArticle


  • Marthe E.M. Buan
  • Navaneethan Muthuswamy
  • John C. Walmsley
  • De Chen
  • Magnus Rønning

Research units

  • Norwegian University of Science and Technology
  • SINTEF Materials and Chemistry


A systematic evaluation of the oxygen reduction reaction (ORR) on nitrogen-doped carbon nanofibers (N-CNFs) has been performed by tuning the properties of the N-CNFs by using chemical vapor deposition. Analysis of the as-synthesized N-CNFs shows that the iron used as the growth catalyst consists of iron carbides, including Fe7C3, χ-Fe5C2, and θ-Fe3C, depending on the carbon activity of the synthesis feed. Furthermore, a relationship between the growth catalyst phase, the N-CNF properties, and the electrocatalytic activity for the oxygen reduction in acidic electrolyte is revealed. The best catalytic activity and selectivity was achieved if the N-CNFs were grown from Hägg carbide, χ-Fe5C2, suggesting that this carbide phase favors the incorporation of active sites into the N-CNFs. Controlling the phase of the iron particles used as growth catalysts is therefore essential for obtaining N-CNFs with a high active site density for the oxygen reduction reaction.


Original languageEnglish
Pages (from-to)1663-1674
Number of pages12
Issue number9
Publication statusPublished - 10 May 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • carbon nanofibers, chemical vapor deposition, nitrogen-doped carbon, oxygen reduction reaction

ID: 19136486