Electrochemical oxygen reduction on carbon nitride

S. M. Lyth, Y. Nabae, N. M. Islam, S. Kuroki, M. Kakimoto, J. Ozaki, S. Miyata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Electrochemical oxygen reduction via non-precious, Fe-macrocycle-derived catalysts has potential to reduce the cost and increase acceptance of hydrogen-powered polymer electrolyte membrane fuel cells. However since these materials are a complex mixture of carbon, nitrogen and iron, the nature of the active site is still much debated. By using carbon nitride as an ideal, nitrogen-rich, iron-free catalyst we shed light on the role of carbon-nitrogen bonding in electrochemical oxygen reduction. Carbon nitride was synthesized on a carbon black support via a simple solvothermal process. The resulting material was pyrolyzed and characterized via a variety of techniques. Electrochemical testing revealed that carbon nitride pyrolyzed at 1000°C displayed the best oxygen reduction activity, with an onset potential of 0.90V and a low selectivity to H2O2 formation, indicating a 4-electron oxygen reduction pathway. The enhanced activity is attributed to enriched quaternary nitrogen in the material at this temperature, as confirmed by X-ray photoelectron spectroscopy.

Original languageEnglish
Title of host publicationElectrode Processes Relevant to Fuel Cell Technology
PublisherElectrochemical Society Inc.
Pages11-26
Number of pages16
Edition23
ISBN (Electronic)9781566778497
ISBN (Print)9781607681991
DOIs
Publication statusPublished - 2010
Externally publishedYes

Publication series

NameECS Transactions
Number23
Volume28
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

All Science Journal Classification (ASJC) codes

  • General Engineering

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