J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (11): 2543-2551.DOI: 10.1016/j.jmst.2019.07.008

• Orginal Article • Previous Articles     Next Articles

Nitrogen-doped graphite encapsulated Fe/Fe3C nanoparticles and carbon black for enhanced performance towards oxygen reduction

Zhu Jiea, Xiong Zeweia, Zheng Jiminga, Luo Zhihonga, Zhu Guangbina, Xiao Chaoa, Meng Zhengbinga, Li Yibinga*(), KunLuob*()   

  1. aCollege of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
    bSchool of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
  • Received:2019-01-27 Revised:2019-05-06 Accepted:2019-05-20 Online:2019-11-05 Published:2019-10-21
  • Contact: Li Yibing,KunLuo
  • About author:

    1The authors equally contributed to this work.

Abstract:

Non-noble metal (NNM) catalysts have recently attracted intensive interest for their high catalytic performance towards oxygen reduction reaction (ORR) at low cost. Herein, a novel NNM catalyst was synthesized by the simple pyrolysis of carbon black, urea and a Fe-containing precursor, which exhibits excellent ORR catalytic activity, superior durability and methanol tolerance versus the Pt/C catalyst in both alkaline and acidic solutions. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterizations demonstrate that the product is a nitrogen-doped hybrid of graphite encapsulated Fe/Fe3C nanoparticles and carbon black. X-ray photoelectron spectrum (XPS) and electrochemical analyses indicate that the catalytic performance and chemical stability correlate closely with a nitrogen-rich layer on the Fe/Fe3C nanoparticle after pyrolysis with presence of urea, leading to the same four-electron pathway towards ORR as the Pt/C catalyst. The hybrid is prospective to be an efficient ORR electrocatalyst for direct methanol fuel cells with high catalytic performance at low cost.

Key words: Nitrogen doping, Hybrid, Fe/Fe3C, Carbon black, Oxygen reduction reaction