Defect-controlled Fe-N-doped carbon nanofiber by ball-milling for oxygen reduction reaction
- Defect-controlled Fe-N-doped carbon nanofiber by ball-milling for oxygen reduction reaction
- 유성종; 손연선; 김동건; 이수진; 황인선; 이수형; 김필; 이지호
- Issue Date
- The Korean journal of chemical engineering
- VOL 37, NO 6-945
- 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).
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