A highly active and durable Co-N-C electrocatalyst synthesized using exfoliated graphitic carbon nitride nanosheets

Jin Hee Lee, Min Jung Park, Sung Jong Yoo, Jong Hyun Jang, Hyoung Juhn Kim, SukWoo Nam, Chang Won Yoon, Jin Young Kim

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Exfoliated graphitic carbon nitride nanosheets (g-C<inf>3</inf>N<inf>4</inf>-NS) were applied for the first time for the preparation of an electrocatalyst for the oxygen reduction reaction (ORR). A less dense structure with increased surface area was observed for g-C<inf>3</inf>N<inf>4</inf>-NS compared to bulk g-C<inf>3</inf>N<inf>4</inf> from detailed analyses including TEM, STEM, AFM with depth profiling, XRD, and UV-Vis spectroscopy. The pyrolysis of the prepared g-C<inf>3</inf>N<inf>4</inf>-NS with Co and carbon under an inert environment provided an enhanced accessibility to the N functionalities required for efficient interaction of Co and C with N for the formation of Co-N-C networks and produced a hollow and interconnected Co-N-C-NS structure responsible for high durability. The Co-N-C-NS electrocatalyst exhibited superior catalytic activity and durability and further displayed fast and selective four electron transfer kinetics for the ORR, as evidenced by various electrochemical experiments. The hollow, interconnected structure of Co-N-C-NS with increased pyridinic and graphitic N species has been proposed to play a key role in facilitating the desired ORR reaction.

Original languageEnglish
Pages (from-to)10334-10339
Number of pages6
JournalNanoscale
Volume7
Issue number23
DOIs
Publication statusPublished - 2015 Jun 21

ASJC Scopus subject areas

  • Materials Science(all)

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    Lee, J. H., Park, M. J., Yoo, S. J., Jang, J. H., Kim, H. J., Nam, S., Yoon, C. W., & Kim, J. Y. (2015). A highly active and durable Co-N-C electrocatalyst synthesized using exfoliated graphitic carbon nitride nanosheets. Nanoscale, 7(23), 10334-10339. https://doi.org/10.1039/c5nr01584g