A comparative study of pyrolyzed and doped cobalt-polypyrrole eletrocatalysts for oxygen reduction reaction
A comparative study of pyrolyzed and doped cobalt-polypyrrole eletrocatalysts for oxygen reduction reaction
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DOI：
10.1016/j.apsusc.2011.12.098
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发表时间：
2012-02
影响因子：
6.7
通讯作者：
Wei Feng;Hengyi Li;Xuan Cheng;T. Jao;F. Weng;A. Su;Y. Chiang
中科院分区：
文献类型：
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作者：
Wei Feng;Hengyi Li;Xuan Cheng;T. Jao;F. Weng;A. Su;Y. Chiang
分别以十二烷基苯磺酸钠（DBSNa）、对甲苯磺酸钠（TSNa）和苯磺酸钠（BSNa）为掺杂剂，以三氯化铁为氧化剂，采用化学氧化法制备了热解碳负载钴聚吡咯（Co-PPy/C）催化剂。采用X射线衍射、X射线光电子能谱、BET比表面积分析、循环伏安、旋转圆盘电极技术和拉曼光谱等手段对催化剂的结构、表面和电化学性能进行了表征。掺杂剂的引入增加了氮和钴的表面浓度，为氧还原反应（ORR）提供了更多的活性位点，同时提高了碳载体的石墨化程度，提高了电子电导率。未掺杂和掺杂的Co-PPy/C的ORR的电子数分别被评估为2.7-3.1。热解的BSNa掺杂的Co-PPy/C表现出最好的电催化活性对ORR由于其更高的表面积，大量的微孔，以及相对较高的氮和钴含量。
The pyrolyzed carbon supported cobalt polypyrrole (Co-PPy/C) catalysts were prepared without or with three selected dopants, namely, sodium dodecylbezene sulfonate (DBSNa), sodium paratoluene sulfonate (TSNa) and sodium bezene sulfonate (BSNa), respectively, through chemical oxidation with ferric chloride as an oxidant. The structure, surface and electrochemical properties of the obtained catalysts were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer–Emmitt–Teller (BET) analysis, cyclic voltammetry, rotating disc electrode technique and Raman spectroscopy. The introduction of dopants increased the surface concentrations of nitrogen and cobalt which would provide more active sites for oxygen reduction reaction (ORR), and enhanced the graphitization degree of carbon support which would improve the electron conductivity. The electron numbers of ORR for the non-doped and doped Co-PPy/C were evaluated to be 2.7–3.1, respectively. The pyrolyzed BSNa-doped Co-PPy/C exhibited the best electrocatalytic activity toward ORR due to its higher surface areas, larger amounts of micropores, as well as relatively higher nitrogen and cobalt contents.