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Title
Japanese: 
English:Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer 
Author
Japanese: Yusuke Hiraike, Makoto Saito, Hideharu Niwa, 小林 正起, Yoshihisa Harada, 尾嶋 正治, Jaehong Kim, 難波江 裕太, 柿本 雅明.  
English: Yusuke Hiraike, Makoto Saito, Hideharu Niwa, Masaki Kobayashi, Yoshihisa Harada, Masaharu Oshima, Jaehong Kim, Yuta Nabae, Masa-aki Kakimoto.  
Language English 
Journal/Book name
Japanese: 
English:Nanoscale Research Letters 
Volume, Number, Page Vol. 10    No. 1    pp. 179
Published date 2015 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://www.nanoscalereslett.com/content/10/1/179
 
DOI https://doi.org/10.1186/s11671-015-0881-8
Abstract Carbon-based cathode catalysts derived from a hyperbranched iron phthalocyanine polymer (HB-FePc) were characterized, and their active-site formation mechanism was studied by synchrotron-based spectroscopy. The properties of the HB-FePc catalyst are compared with those of a catalyst with high oxygen reduction reaction (ORR) activity synthesized from a mixture of iron phthalocyanine and phenolic resin (FePc/PhRs). Electrochemical measurements demonstrate that the HB-FePc catalyst does not lose its ORR activity up to 900degreesC, whereas that of the FePc/PhRs catalyst decreases above 700degreesC. Hard X-ray photoemission spectra reveal that the HB-FePc catalysts retain more nitrogen components than the FePc/PhRs catalysts between pyrolysis temperatures of 600degreesC and 800degreesC. This is because the linked structure of the HB-FePc precursor has high thermostability against nitrogen desorption. Consequently, effective doping of active nitrogen species into the sp2 carbon network of the HB-FePc catalysts may occur up to 900degreesC.

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