Journal
CARBON
Volume 54, Issue -, Pages 249-257Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2012.11.036
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Funding
- National Natural Science Foundation of China [21105041, 21127006, 21075058, 21005036]
- Key Project of Natural Science Foundation [ZR2010BZ004, JQ201106]
- Tai-Shan Scholar Research Fund of Shandong Province
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Three-dimensional flowerlike nitrogen-doped carbons (NCs) have been prepared by copyrolysis of solid ferrocene and melamine at 500-700 degrees C. X-ray photoelectron spectroscopy N1s spectra show three kinds of C-N bonding patterns: pyridinic-, pyrrolic-, and graphitic-type nitrogen species, and the atomic percentage of doping nitrogen can be adjusted between 0.67% and 4.62% by controlling reaction temperature. The electrocatalytic performance of as-prepared NCs for oxygen reduction reaction (ORR) is evaluated, and it is found that the NC-600 with the highest content of pyridinic-type nitrogen species outperforms other NC catalysts in ORR electrocatalytic activity in terms of half-wave potential, number of electrons transferred, and kinetic current density. It suggests that the pyridinic-type nitrogen species are active sites of NC catalysts and responsible for the enhanced ORR performance. Compared with the commercial Pt/C catalyst, the as-prepared NC catalysts exhibit a superior methanol tolerance for ORR in alkaline medium. (c) 2012 Elsevier Ltd. All rights reserved.
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