Journal
JOURNAL OF POWER SOURCES
Volume 250, Issue -, Pages 279-285Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.11.011
Keywords
Non-noble; N-doped; Carbide; Oxygen reduction reaction; X-ray absorption spectroscopy
Funding
- National Science Council, Taiwan [NSC99-2221-E-151-044-MY2]
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A simple method has been developed for synthesis of carbons incorporating FeNx electrocatalysts (FeNC/C-z) based on heat treatment of nitrogen-rich species (pentaethylenehexamine) and iron precursors (FeCl3) on carbon blacks (Vulcan XC-72) under high temperature in a nitrogen atmosphere. These resulting catalysts have been fully characterized by various spectroscopic and analytical techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). Results obtained from the polarization curves show that FeNC/C-3.1 possesses the surpassing electrocatalytic activity and the tolerance to methanol crossover during the oxygen reduction reaction (ORR) among all the FeNC/C-z catalysts, which may be due to their higher surface Fe/C and N/C atomic ratios as well as a dominant carbon incorporated FeNx (x approximate to 4), as revealed from XPS and XAS spectroscopies. (C) 2013 Elsevier B.V. All rights reserved.
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