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http://dx.doi.org/10.3740/MRSK.2018.28.11.640

Synthesis of Fe3C-Embedded Nitrogen Doped Carbon for Oxygen Reduction Reaction  

Lee, Young-Geun (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
An, Geon-Hyoung (Program of Materials Science & Engineering, Convergence Institute of Biomedical Engineering and Biomaterials, Seoul National University of Science and Technology)
Ahn, Hyo-Jin (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Publication Information
Korean Journal of Materials Research / v.28, no.11, 2018 , pp. 640-645 More about this Journal
Abstract
The design of non-precious electrocatalysts with low-cost, good stability, and an improved oxygen reduction reaction(ORR) to replace the platinium-based electrocatalyst is significant for application of fuel cells and metal-air batteries with high energy density. In this study, we synthesize iron-carbide($Fe_3C$) embedded nitrogen(N) doped carbon nanofiber(CNF) as electrocatalysts for ORRs using electrospinning, precursor deposition, and carbonization. To optimize electrochemical performance, we study the three stages according to different amounts of iron precursor. Among them, $Fe_3C$-embedded N doped CNF-1 exhibits the most improved electrochemical performance with a high onset potential of -0.18 V, a high $E_{1/2}$ of -0.29 V, and a nearly four-electron pathway (n = 3.77). In addition, $Fe_3C$-embedded N doped CNF-1 displays exellent long-term stabillity with the lowest ${\Delta}E_{1/2}=8mV$ compared to the other electrocatalysts. The improved electrochemical properties are attributed to synergestic effect of N-doping and well-dispersed iron carbide embedded in CNF. Consequently, $Fe_3C$-embedded N doped CNF is a promising candidate for non-precious electrocatalysts for high-performance ORRs.
Keywords
oxygen reduction reaction; carbon nanofiber; nitrogen doping; iron carbide;
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