Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 158, Issue -, Pages 355-360Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2014.04.038
Keywords
Non-precious catalyst; Nitrogen doped carbon; Ionic liquid; Oxygen reduction reaction; sp(2) Carbon network
Funding
- Priority Research Centers Program through the National Research Foundation of Korea - Ministry of Education, Science and Technology [2009-0093823, NRF-2009-C1AAA001-0092926]
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Nitrogen-doped carbon catalysts for the oxygen reduction reaction (ORR) were synthesized by the pyrolysis of ionic liquids (IL), which are precursors of both nitrogen and carbon, using a silica hard template in the presence of a transition metal. From the linear sweep voltammogram recorded in an acidic solution, the ORR activity of the nitrogen-doped carbon catalysts increased significantly after the addition of the transition metal during the pyrolysis of the IL. From XPS-N 1s analysis, the introduction of the transition metal positively contributes to the formation of graphitic-N, which is known to be an active site for the ORR. The results of XPS-C 1s suggest a strong correlation between the sp(2)-carbon network and the ORR activity. Co is a more effective metal compared to Ni due to the creation of a higher degree of sp(2)-carbon networks for fast electron transfer during the ORR. Based on the quantitative analysis of the experimental results, the IL is a promising precursor for nitrogen-doped carbon catalysts, and the addition of a transition metal is essential for improved activity of the ORR. (C) 2014 Elsevier B.V. All rights reserved.
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