Oxygen reduction reaction on a polypyrrole-modified, carbon-supported cobalt hydroxide catalyst

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• 作者：Hai Ying Qin ; Kun Ning Zhu ; Li Qiang Ye ; Zhou Peng Li ; ^{zhoupengli@zju.edu.cn}
• 关键词：Oxygen reduction reaction ; Polypyrrole-modified carbon-supported cobalt hydroxide ; Electrocatalytic activity ; Catalytic site ; Cell performance
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 June, 2012
• 卷：208
• 期：Complete
• 页码：203-209
• 文件大小：1339 K

摘要

A series of polypyrrole (PPY)-modified carbon-supported Co(OH)₂ catalysts [Co(OH)₂-PPY-C] with different types of carbon supports and the PPY and Co(OH)₂ contents are synthesized to investigate the effect of the CoNx and CNC sites on the oxygen reduction reaction (ORR). X-ray photoemission spectroscopy results reveal that the CoNx and CNC sites dominate the four- and two-electron transfer ORR, respectively. The carbon support and the PPY and Co(OH)₂ contents of the catalysts determine the distribution of the CoNx and CNC sites. The competition between these two sites determines the overall electron number of the ORR. A direct borohydride fuel cell using an optimal Co(OH)₂-PPY-C as the cathode catalyst exhibits a maximum power density of 550 mW cm^鈭? at 80 掳C.