화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.37, No.6, 938-945, June, 2020
DOI10.1007/s11814-020-0522-5  Export Citation
Defect-controlled Fe-N-doped carbon nanofiber by ball-milling for oxygen reduction reaction
Yeonsun Sohn1, Dong-gun Kim1, Ji Ho Lee1, Sujin Lee1, In Seon Hwang1, Soo-Hyoung Lee1, Sung Jong Yoo2, 3, and Pil Kim1, †
  • 1School of Chemical Engineering, School of Semiconductor and Chemical Engineering, Solar Energy Research Center, Jeonbuk National University, JeonJu, Jeonbuk 54896, Korea
  • 2Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea
  • 3Division of Energy & Environment Technology, KIST School, University of Science and Technology (UST), Seoul 02792, Korea
E-mail:
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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