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Issue
Korean Journal of Chemical Engineering,
Vol.37, No.6, 938-945, 2020
Defect-controlled Fe-N-doped carbon nanofiber by ball-milling for oxygen reduction reaction
Sohn Y, Kim DG, Lee JH, Lee SJ, Hwang IS, Lee SH, Yoo SJ, Kim P
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-Fe-VGCNF (x=4, 6).
Keywords: Fuel Cells; Oxygen Reduction Reaction (ORR); Non-precious Metal Catalysts; High-energy Ball-mill; Vapor Grown Carbon Nano Fiber (VGCNF)
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