The role of transition metals in non-precious nitrogen-modified carbon-based electrocatalysts for oxygen reduction reaction

Title
The role of transition metals in non-precious nitrogen-modified carbon-based electrocatalysts for oxygen reduction reaction
Authors
오형석김한성
Keywords
Non-precious metal catalyst; Oxygen reduction reaction; Transition metal; Active site; Polymer electrolyte membrane fuel cell
Issue Date
2012-08
Publisher
Journal of power sources
Citation
VOL 212-225
Abstract
This study examines the role of transition metals (Co or Fe) on nitrogen-modified carbon-based catalysts for the oxygen reduction reaction (ORR). The nitrogen-modified carbon-based catalysts are synthesized by the pyrolysis process in the presence of polypyrrole (PPy) and ethylenediamine (ED) with different amounts of transition metals. Electrochemical data and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) analysis do not support that the transition metal itself behaves as an active site for ORR. The X-ray photoelectron spectroscopy (XPS) and elemental analysis results show that the total nitrogen content and the active nitrogen functional groups, such as pyridinic-N and graphitic-N, are strongly dependent on the type of transition metal and the amount of transition metal used. Therefore, it is believed that transition metals serve to catalyze the formation of active nitrogen functional groups for the ORR by doping nitrogen into carbon.
URI
http://pubs.kist.re.kr/handle/201004/67019
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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