Electrochemical catalytic activity for oxygen reduction reaction of nitrogen-doped carbon nanofibers

Jiyoung Kim, Seongyop Lim, Sang Kyung Kim, Dong Hyun Peck, Byungrok Lee, Seong Ho Yoon, Doohwan Jung

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The electrocatalytic activity of nitrogen-doped carbon nanofibers (N-CNFs), which are synthesized directly from vaporized acetonitrile over nickel-iron based catalysts, for oxygen reduction reaction (ORR), was investigated. The nitrogen content and specific surface area of N-CNFs can be controlled through the synthesis temperature (300 vie 680 °C). The graphitization degree of N-CNFs also are significantly affected by the temperature, whereas the chemical compositions of nitrogen species are similar irrespective of the synthesis conditions. From measurement of the electrochemical double layer capacitance, the surface of N-CNFs is found to have stronger interaction with ions than undoped-carbon surfaces. Although N-CNFs show higher over-potential than Pt catalysts do, N-CNFs were observed to have a noticeable ORR activity, as opposed to the carbon samples without nitrogen doping. The activity dependency of N-CNFs on the content of the nitrogen with which they were doped is discussed, based on the experiment results. The single cell of the direct methanol fuel cell (DMFC) was tested to investigate the performance of a membrane-electrode assembly that includes N-CNFs as the cathode catalyst layer.

Original languageEnglish
Pages (from-to)6350-6358
Number of pages9
JournalJournal of nanoscience and nanotechnology
Volume11
Issue number7
DOIs
Publication statusPublished - Jul 1 2011

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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