Atomic Structure of Polypyrrole-Modified Carbon-Supported Cobalt Catalyst

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• 作者：Juan Wang ; Haiying Qin ; Jiabin Liu ; Zhoupeng Li ; Hua Wang ; Ke Yang ; Aiguo Li ; Yan He ; Xiaohan Yu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：September 27, 2012
• 年：2012
• 卷：116
• 期：38
• 页码：20225-20229
• 全文大小：349K
• 年卷期：v.116,no.38(September 27, 2012)
• ISSN：1932-7455

文摘

Carbon-supported cobalt catalyst (Co-BP) and polypyrrole-modified carbon-supported cobalt catalyst (Co-PPY-BP) are prepared by an impregnation鈥揷hemical method and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and X-ray absorption fine structure, to investigate their electronic and atomic structures. It is found that a Co ion bonds with two pyrrolic N atoms to form a Co鈥揘₂ bond in the Co-PPY-BP sample. Those two N atoms together with four O atoms at 2.04 脜 constitute a distorted octahedral structure. The Co鈥揘₂ bond, in which the central Co ion has a high valence electron density, is confirmed to be the main active site of Co-PPY-BP toward oxygen reduction reaction in alkaline electrolyte.