On the Origin of Electrocatalytic Oxygen Reduction Reaction on Electrospun Nitrogen鈥揅arbon Species

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• 作者：Dongyoon Shin ; Beomgyun Jeong ; Bongjin Simon Mun ; Hongrae Jeon ; Hyun-Joon Shin ; Jaiyoon Baik ; Jaeyoung Lee
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：June 6, 2013
• 年：2013
• 卷：117
• 期：22
• 页码：11619-11624
• 全文大小：353K
• 年卷期：v.117,no.22(June 6, 2013)
• ISSN：1932-7455

文摘

Nitrogen鈥揷arbon (N鈥揅) species is a potential electrocatalyst for oxygen reduction reaction (ORR) in electrochemical energy conversion cells, but its mechanistic origin of ORR on the N鈥揅 surface is still unclear. We show our facile approach to the synthesis of highly active Co-modified N鈥揅 catalyst and investigated the origin of ORR activity of electrospun N鈥揅 species by removing the metal with hydroxide carbon etching and acid metal leaching. Through the detailed investigation on the origin of ORR electrocatalysis for electrospun N鈥揅 nanofibers, we revealed that pyrrolic-N and highly graphitized carbon structure are mainly responsible for the enhanced ORR activity of metal-free N鈥揅 nanofiber and embedded Co metal got involved in the creation of the pyrrolic N site.