催化作用
金属salen络合物
化学
氧还原反应
无机化学
碳纤维
金属
氧还原
热解
氧气
X射线光电子能谱
还原(数学)
电催化剂
有机化学
电化学
物理化学
几何学
数学
电极
作者
Yuta Tanaka,Akira Onoda,Okuoka Shinichi,Tomoyuki Kitano,Koki Matsumoto,Takao Sakata,Hidehiro Yasuda,Takashi Hayashi
出处
期刊:Chemcatchem
[Wiley]
日期:2018-02-21
卷期号:10 (4): 743-750
被引量:13
标识
DOI:10.1002/cctc.201701629
摘要
Nonprecious metal electrocatalysts are being explored as alternatives to platinum-group metal electrocatalysts for the oxygen reduction reaction (ORR) which is required for cathode materials in fuel cells. Herein, we describe a new method for preparing metal and nitrogen-containing carbon (M/N/C) catalysts with high ORR activity using π-expanded Fe(Salen) precursors. The Fe/N/C ORR catalysts were obtained by pyrolysis of a mixture of carbon support (Vulcan XC-72R) and the iron complex precursors. The Fe/N/C catalyst prepared from N,N´-bis(2-hydroxy-1-naphthylidene)-1,2-phenylenediamino-iron(III) chloride is found to have an onset potential of 860 mV, which is positively shifted by 60 mV from that of the catalyst prepared from the simple Fe(Salen) complex. The catalyst promotes efficient four-electron reduction in the ORR. XAFS and XPS studies reveal that the Fe/N/C catalysts have atomically-dispersed iron active sites and that the activity depends on high content of pyridinic nitrogen. This new methodology facilitates design of the nonprecious metal-carbon catalysts with excellent ORR activity.
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