Defect-controlled Fe-N-doped carbon nanofiber by ball-milling for oxygen reduction reaction

Title
Defect-controlled Fe-N-doped carbon nanofiber by ball-milling for oxygen reduction reaction
Authors
유성종손연선김동건이수진황인선이수형김필이지호
Issue Date
2020-06
Publisher
The Korean journal of chemical engineering
Citation
VOL 37, NO 6-945
Abstract
We demonstrate that control of the defect level on carbon materials is effective for enhancing the oxygen reduction reaction (ORR) performance of nonprecious-metal catalysts. Vapor-grown carbon nanofiber (VGCNF) with high crystallinity and high electronic conductivity was chosen as the substrate of our ORR catalysts. To induce defects on the VGCNF, it was subjected to ball-milling for various controlled times, yielding BMx-VGCNF (x represents the ball-milling time, 0-6 h). The defect level introduced on the VGCNF was effectively regulated by controlling the ballmilling time. Although the density of defect sites increased with increasing ball-milling time, the surface area was highest in BM2-VGCNF. Nonprecious-metal ORR catalysts (BMx-Fe-VGCNF) were prepared by NH3 pyrolysis of Fe-ionadsorbed BMx-VGCNF. The ball-milling of VGCNF was effective to introduce nitrogen onto the catalyst. In particular, the controlled ball-milling was important to generate highly active sites on the catalyst surface. Among the catalysts studied, BM2-Fe-VGCNF exhibited the best ORR performance, which was 2.5-times greater than that of BMx-FeVGCNF (x=4, 6).
URI
http://pubs.kist.re.kr/handle/201004/72060
ISSN
0256-1115
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