Improved performance of proton exchange membrane fuel cells with p-toluenesulfonic acid-doped co-PPy/C as cathode electrocatalyst.
Improved performance of proton exchange membrane fuel cells with p-toluenesulfonic acid-doped co-PPy/C as cathode electrocatalyst.
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DOI：
10.1021/ja909537g
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发表时间：
2010-01
影响因子：
15
通讯作者：
Xianxia Yuan;Xin Zeng;Hui-Juan Zhang;Zifeng Ma;Chaoyang Wang
中科院分区：
文献类型：
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作者：
Xianxia Yuan;Xin Zeng;Hui-Juan Zhang;Zifeng Ma;Chaoyang Wang
在惰性气氛下，通过对甲苯磺酸（TsOH）掺杂聚吡咯修饰碳载体热解钴盐，制备了一种用于质子交换膜燃料电池（pemfc）氧还原反应（ORR）的新型催化剂Co-PPy-TsOH/C。采用拉曼光谱、元素分析、旋转环盘电极分析和单个H(2)-O(2) PEMFC等技术对Co-PPy- tsoh /C的电催化性能进行了分析，并与未掺杂的Co-PPy/C进行了比较。结果表明，掺杂TsOH使Co-PPy-TsOH/C中N和S含量增加，导致Co-PPy-TsOH/C对ORR的电催化性能远优于Co-PPy/C， Co-PPy-TsOH/C更容易发生四电子转移反应，将氧直接还原为H(2)O。以Co-PPy- tsoh /C为阴极催化剂的PEMFCs性能优于Co-PPy/C，其最大输出功率密度为203 mW cm(-2)，比文献中以Co-PPy/C为阴极催化剂报道的最佳值有了很大的提高。这表明掺杂TsOH是提高Co-PPy/C催化活性的一种有价值的方法，Co-PPy-TsOH/C是一种很有前途的pemfc阴极催化剂。分析了掺杂的作用和机理，提出了PPy-TsOH/C和Co-PPy-TsOH/C的构型。
A novel catalyst, Co-PPy-TsOH/C, for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) was prepared by pyrolyzing cobalt salt and p-toluenesulfonic acid (TsOH)-doped polypyrrole-modified carbon support in an inert atmosphere. The characteristics and electrocatalytic activities of Co-PPy-TsOH/C were analyzed with various techniques, including Raman spectroscopy, elemental analysis, rotating ring disk electrode analysis, and a single H(2)-O(2) PEMFC, and compared with those of undoped catalyst Co-PPy/C. The results showed that doping TsOH introduces larger N and S contents in Co-PPy-TsOH/C, leading to much better electrocatalytic performance for ORR than Co-PPy/C, and that Co-PPy-TsOH/C is more likely to follow a four-electron-transfer reaction to reduce oxygen directly to H(2)O. The performance of PEMFCs with Co-PPy-TsOH/C as cathode catalyst is better than that with Co-PPy/C, and the resulting maximum output power density of 203 mW cm(-2) is a substantial improvement over the best values reported in the literature with Co-PPy/C-based cathode catalyst. This implies that doping TsOH is a valuable method to improve the catalytic activity of Co-PPy/C and that Co-PPy-TsOH/C is a promising cathode catalyst for PEMFCs. The function and mechanism of doping have also been analyzed and the configurations of PPy-TsOH/C and Co-PPy-TsOH/C proposed.