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Issue 27, 2015
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Cobalt-carbon nanofibers as an efficient support-free catalyst for oxygen reduction reaction with a systematic study of active site formation

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Abstract

Recently, major efforts have been devoted to exploring cheap and active non-precious metal catalysts for the oxygen reduction reaction (ORR) in fuel cells for large-scale applications. Herein, we report electrospun cobalt-carbon nanofibers (Co-CNFs) as an efficient catalyst for the ORR, together with a systematic study of the active site formation. The ORR activity of the Co-CNFs increases with increasing Co content up to approximately 30 wt%, at which high ORR activity is exhibited, comparable with a commercial Pt/C catalyst in alkaline media. XPS and structural analysis reveals a Co–pyridinic Nx bond at the edge plane, and more Co nanoparticles were found in the Co-CNFs as the Co content was increased. These sites can behave as the primary and the secondary active sites for the ORR, according to a dual-site mechanism. The ORR activity of the Co-CNFs may deteriorate even if only one of these sites is limited. The high ORR activity of the Co-CNF catalysts results from the synergetic effect of dual site formation for the ORR.

Graphical abstract: Cobalt-carbon nanofibers as an efficient support-free catalyst for oxygen reduction reaction with a systematic study of active site formation

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Publication details

The article was received on 19 Mar 2015, accepted on 01 Jun 2015 and first published on 03 Jun 2015


Article type: Paper
DOI: 10.1039/C5TA02031J
J. Mater. Chem. A, 2015,3, 14284-14290

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    Cobalt-carbon nanofibers as an efficient support-free catalyst for oxygen reduction reaction with a systematic study of active site formation

    M. Kim, D. Nam, H. Park, C. Kwon, K. Eom, S. Yoo, J. Jang, H. Kim, E. Cho and H. Kwon, J. Mater. Chem. A, 2015, 3, 14284
    DOI: 10.1039/C5TA02031J

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