The influence of the structural properties of carbon on the oxygen reduction reaction of nitrogen modified carbon based catalysts

Title
The influence of the structural properties of carbon on the oxygen reduction reaction of nitrogen modified carbon based catalysts
Authors
오형석오종길이웅희김현종김한성
Keywords
Nitrogen doping; Carbon nanofiber; Non precious catalysts; Oxygen reduction reaction; PEM fuel cell
Issue Date
2011-07
Publisher
International journal of hydrogen energy
Citation
VOL 36, NO 14-8186
Abstract
Nitrogen modified carbon based catalysts for the oxygen reduction reaction (ORR) were synthesized using three different types of carbon, carbon black (CB), carbon nanotube (CNT) and platelet carbon nanofiber (P-CNF) with nitrogen containing organic precursors. The relationship between the ORR activity and the carbon nanostructure was explored using various electrochemical and physical characterization methods. It was found that the ORR activity was affected by the type and content of the nitrogen functional group instead of the carbon surface area. The formation of nitrogen functional group, in turn, strongly depends on the carbon nanostructure. Unlike the basal plane, the edge plane exposure provides the appropriate geometry for the nitrogen incorporation into carbon structure, resulting in high nitrogen content and high pyridinic-N and graphitic-N content, providing an active site for ORR. Therefore, the P-CNF based catalyst with the highest edge plane exposure has the highest ORR activity despite having the smallest surface area.
URI
http://pubs.kist.re.kr/handle/201004/67022
ISSN
0360-3199
Appears in Collections:
KIST Publication > Article
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