Journal
JOURNAL OF POWER SOURCES
Volume 188, Issue 1, Pages 38-44Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.11.087
Keywords
Carbon-based catalyst; Nitrogen modification; Oxygen reduction; PEM fuel cell
Funding
- Department of Energy [DE-FC36-03GO13108]
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Nitrogen-modified carbon-based catalysts for oxygen reduction were synthesized by modifying carbon black with nitrogen-containing organic precursors. The electrocatalytic properties of catalysts were studied as a function of surface pre-treatments, nitrogen and oxygen concentrations, and heat-treatment temperatures. On the optimum catalyst, the onset potential for oxygen reduction is approximately 0.76V (NHE) and the amount of hydrogen peroxide produced at 0.5V (NHE) is approximately 3% under our experimental conditions. The characterization studies indicated that pyridinic and graphitic (quaternary) nitrogens may act as active sites of catalysts for oxygen reduction reaction. In particular, pyridinic nitrogen, which possesses one lone pair of electrons in addition to the one electron donated to the conjugated pi bond, facilitates the reductive oxygen adsorption. (C) 2008 Elsevier B.V. All rights reserved.
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