Studies of oxygen reduction reaction active sites and stability of nitrogen-modified carbon composite catalysts for PEM fuel cells

被引：310
作者：
Liu, Gang [1 ]
Li, Xuguang [1 ]
Ganesan, Prabhu [1 ]
Popov, Branko N. [1 ]
机构：
[1] Univ S Carolina, Dept Chem Engn, Ctr Electrochem Engn, Columbia, SC 29208 USA
来源：
ELECTROCHIMICA ACTA | 2010年 / 55卷 / 08期
基金：
美国国家科学基金会;
关键词：
Nitrogen-modified carbon composite catalysts; Active site; Oxygen reduction reaction; Stability; PEM fuel cells; ALLOY; ELECTROCATALYSTS; TEMPERATURE; DURABILITY; PYROLYSIS; NANOTUBES; EVOLUTION; ORR;
D O I：
10.1016/j.electacta.2009.12.055
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A non-precious nitrogen-modified carbon composite (NMCC) catalyst is synthesized by the pyrolysis of cobalt, iron-ethylenediamine-chelate complexes on silica followed by chemical and pyrolysis treatments. Pyrolysis temperature and time have a remarkable impact on the content and the type of the nitrogen-containing functional groups in the NMCC catalysts, which affect their catalytic activity and stability. Based on the analysis of the nitrogen functional groups before and after the stability tests, the ORR active sites of the NMCC catalysts are proposed to be pyridinic-N and quaternary-N functional groups. However the pyridinic-N group is not stable in the acidic environment due to the protonation reaction. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2853 / 2858
页数：6
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