Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (4): 539-548.DOI: 10.1016/S1872-2067(15)61049-X

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A Fe-N-C catalyst with highly dispersed iron in carbon for oxygen reduction reaction and its application in direct methanol fuel cells

Lingzheng Gua,c, Luhua Jianga, Xuning Lib,c, Jutao Jina, Junhu Wangb, Gongquan Suna   

  1. a Division of Fuel Cell & Battery, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-01-07 Revised:2016-01-29 Online:2016-03-30 Published:2016-03-30
  • Contact: Luhua Jiang, Gongquan Sun
  • Supported by:

    This work was supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDA09030104), the National Basic Research Program of China(973 Program, 2012CB215500), and the National Natural Science Foundation of China(21576258, 50823008).

Abstract:

Exploring non-precious metal catalysts for the oxygen reduction reaction (ORR) is essential for fuel cells and metal-air batteries. Herein, we report a Fe-N-C catalyst possessing a high specific surface area (1501 m2/g) and uniformly dispersed iron within a carbon matrix prepared via a two-step pyrolysis process. The Fe-N-C catalyst exhibits excellent ORR activity in 0.1 mol/L NaOH electrolyte (onset potential, Eo = 1.08 V and half wave potential, E1/2 = 0.88 V vs. reversible hydrogen electrode) and 0.1 mol/L HClO4 electrolyte (Eo = 0.85 V and E1/2 = 0.75 V vs. reversible hydrogen electrode). The direct methanol fuel cells employing Fe-N-C as the cathodic catalyst displayed promising performance with a maximum power density of 33 mW/cm2 in alkaline media and 47 mW/cm2 in acidic media. The detailed investigation on the composition-structure- performance relationship by X-ray diffraction, X-ray photoelectron spectroscopy and Mössbauer spectroscopy suggests that Fe-N4, together with graphitic-N and pyridinic-N are the active ORR components. The promising direct methanol fuel cell performance displayed by the Fe-N-C catalyst is related to the intrinsic high catalytic activity, and critically for this application, to the high methanol tolerance.

Key words: Highly dispersed iron, Microporous carbon, Oxygen reduction reaction, Direct methanol fuel cell