期刊
CHEMCATCHEM
卷 9, 期 9, 页码 1663-1674出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201601585
关键词
carbon nanofibers; chemical vapor deposition; nitrogen-doped carbon; oxygen reduction reaction
资金
- Norwegian University of Science and Technology (NTNU)
- European Commission 7th Framework Programme (FP7) through FREECATS project [280658]
- NORTEM within INFRASTRUCTURE program of the Research Council of Norway (RCN) [197405]
- RCN
- project partners NTNU
- University of Oslo
- SINTEF
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, -Fe5C2, and -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 Hagg carbide, -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.
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