Enhancement of Performance of Fe-N-C Catalysts by Copper and Sulfur Doping for the Oxygen Reduction Reaction

doi:10.7503/cjcu20200155

Abstract

Abstract: A series of nonnoble metal oxygen reduction electrocatalysts was prepared using FeCl₃·6H₂O, Cu(NO₃)₂·3H₂O, KSCN, mildly oxidized BP-2000 and melamine as iron source, copper source, sulfur source, carbon source and nitrogen source, respectively. The morphology and structure of the catalysts were characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and inductively coupled plasma atomic emission spectroscopy(ICP-AES). Then the oxygen reduction performances of the catalysts were evaluated by rotating disk and rotating disk ring tests, and the effect of copper and sulfur doping on catalysts performance was analyzed. The results demonstrate that sulfur doping can significantly promote turnover frequency(TOF) values of Fe-N-C catalysts than copper doping, and effectively reduce peroxide yields. In addition, the copper and sulfur doped Fe-N-C catalyst possesses higher TOF value and lower peroxide yield than the undoped Fe-N-C catalyst. The activation of Fe-N_x sites by sulfur doping and the synergistic effect of adjacent copper-based sites improve the activity and selectivity of the catalysts for oxygen reduction reaction.

Key words: Fuel cell, Oxygen reduction reaction, Electrocatalysis, Nonnoble metal catalyst

CLC Number:

O646

TrendMD:

WANG Yuemin, MENG Qinglei, WANG Xian, GE Junjie, LIU Changpeng, XING Wei. Enhancement of Performance of Fe-N-C Catalysts by Copper and Sulfur Doping for the Oxygen Reduction Reaction[J]. Chem. J. Chinese Universities, 2020, 41(8): 1843.

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