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Journal of Electrochemistry ›› 2018, Vol. 24 ›› Issue (6): 726-732.doi: 10.13208/j.electrochem.180842

• Special Issue in Honor of Professor Baolian Yi on His 80th Birthday • Previous Articles     Next Articles

Fe-N Doped Hollow Carbon Nanospheres Linked by Carbon Nanotubes for Oxygen Reduction Reaction

ZHANG Ya-lin1,2, CHEN Chi1, ZOU Liang-liang1, ZOU Zhi-qing1*, YANG Hui1*   

  1. 1. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;2. University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2018-09-04 Revised:2018-09-14 Online:2018-12-28 Published:2018-09-26
  • Contact: ZOU Zhi-qing, YANG Hui E-mail: zouzq@sari.ac.cn; yangh@sari.ac.cn

Abstract: The development of non-precious metal catalysts for oxygen reduction reaction (ORR) is essential for large-scale application of proton exchange membrane fuel cells. Herein, we present the in situ formed Fe-N doped hollow carbon nanospheres linked by carbon nanotubes composite, synthesized by using ZIF-8 as sacrificed template to form polydopamine (PDA) hollow nanospheres, followed by complexing with FeCl3, high temperature heat-treatment and NH3-etching. ZIF-8 was gradually decomposed simultaneously with PDA coating due to the loss of Zn2+ grabbed by PDA. NH3 etching resulted in the improved surface area, while the reducibility of NH3 resulted in the formation of Fe4N nanoparticles, which benefits the ORR activity of the catalyst. The half-wave potential of the as-prepared of PDA-Fe/N/C-NH3 was 0.79 V, only 60 mV lower than that of commercial Pt/C. The stability and methanol tolerance of PDA-Fe/N/C-NH3 were even superior to that of commercial Pt/C, indicating the good potential of PDA-Fe/N/C-NH3 for the application of fuel cells.

Key words: non-precious metal catalyst, oxygen reduction reaction, polydopamine, NH3-etching, carbon nanotubes/hollow nanospheres composite

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