CIESC Journal ›› 2014, Vol. 65 ›› Issue (6): 2113-2119.DOI: 10.3969/j.issn.0438-1157.2014.06.023

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Effect of Fe/Co mass ratio on activity of non-noble metal catalyst for oxygen reduction reaction

ZHANG Yuhui, YI Qingfeng   

  1. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
  • Received:2013-07-22 Revised:2014-03-06 Online:2014-06-05 Published:2014-06-05
  • Supported by:

    supported by the National Natural Science Foundation of China(21376070,20876038) and the Natural Science Foundation of Hunan Province(14JJ2096).

铁/钴质量比对MWCNT-聚苯胺复合物氧还原电活性的影响

张玉晖, 易清风   

  1. 湖南科技大学化学化工学院, 湖南 湘潭 411201
  • 通讯作者: 易清风
  • 作者简介:张玉晖(1987- ),女,硕士研究生。
  • 基金资助:

    国家自然科学基金项目(21376070,20876038);湖南省高校创新平台开放基金项目(11K023);湖南省自然科学基金项目(14JJ2096)。

Abstract: Transition metal has an important effect on the electrocatalytic activity of non-noble metal catalysts for oxygen reduction reaction (ORR). In this work, the precursor containing MWCNTs, polyaniline, Fe and Co was firstly synthesized, and then the precursor was heated at 900℃ under N2 to obtain the C-N catalysts with different Fe/Co mass ratios. The structure of the catalysts was investigated with SEM and X-ray diffraction. ORR activity of the catalysts in acidic and alkaline media was tested with voltammetry. The prepared catalyst with Fe/Co mass ratio of 6:1 presents the highest electrocatalytic activity for ORR. ORR current density at 2000 r·min-1 was 12.5 mA·mg-1@-0.3 V(vs SCE) in acidic solution and 7.8 mA·mg-1@-0.8 V(vs SCE) in alkaline solution, and onset potential of ORR was 0.52 V(vs SCE) in acidic solution and-0.09 V(vs SCE) in alkaline solution. Fe/Co mass ratio played a great role in the electrocatalytic activity of these non-noble metal catalysts for ORR.

Key words: electrochemistry, fuel cell, catalysis, oxygen reduction reaction, non-noble metal catalyst

摘要: 中心金属离子在非贵金属C-N复合物对氧还原反应(ORR)的电催化活性方面有重要作用。通过将含有多壁碳纳米管(MWCNTs)、聚苯胺与过渡金属Fe和Co的前驱体在N2气氛下于900℃下加热,得到了不同金属比例的C-N催化剂。采用SEM、XRD等对催化剂的结构进行了表征。利用电化学伏安技术,研究了催化剂对ORR的电催化活性及其稳定性。结果表明,当Fe与Co质量比为6:1时催化剂的催化活性最好,在酸性溶液中ORR起始电位达到0.52 V(vs SCE),电流密度为12.5 mA·mg-1@-0.3 V (vs SCE);在碱性溶液中ORR 起始电位为-0.09 V(vs SCE),电流密度为7.8 mA·mg-1@-0.8 V (vs SCE)。结果表明,催化剂中Fe与Co的质量比对催化剂的活性有很大影响。

关键词: 电化学, 燃料电池, 催化, 氧还原, 非贵金属催化剂

CLC Number: