Cobalt-carbon nanofibers as an efficient support- free catalyst for oxygen reduction reaction with a systematic study of active site formation

Title
Cobalt-carbon nanofibers as an efficient support- free catalyst for oxygen reduction reaction with a systematic study of active site formation
Authors
김민중남도환박희영권초롱엄광섭유성종장종현김형준조은애권혁상
Keywords
산소환원반응; 알카라인 연료전지; Cobalt-carbon nanofiber; 비백금계 촉매
Issue Date
2015-07
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 3, NO 27, 14284-14290
Abstract
Recently, major efforts have been devoted to exploring cheap and active non-precious metal catalysts for the oxygen reduction reaction (ORR) in fuel cells for large-scale applications. Herein, we report electrospun cobalt-carbon nanofibers (Co-CNFs) as an efficient catalyst for the ORR, together with a systematic study of the active site formation. The ORR activity of the Co-CNFs increases with increasing Co content up to approximately 30 wt%, at which high ORR activity is exhibited, comparable with a commercial Pt/C catalyst in alkaline media. XPS and structural analysis reveals a Co–pyridinic Nx bond at the edge plane, and more Co nanoparticles were found in the Co-CNFs as the Co content was increased. These sites can behave as the primary and the secondary active sites for the ORR, according to a dual-site mechanism. The ORR activity of the Co-CNFs may deteriorate even if only one of these sites is limited. The high ORR activity of the Co-CNF catalysts results from the synergetic effect of dual site formation for the ORR.
URI
http://pubs.kist.re.kr/handle/201004/49986
ISSN
20507488
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE