Home >

news Help

Publication Information


Title
Japanese: 
English:Fe-containing polyimide-based high-performance ORR catalysts in acidic medium: a kinetic approach to study the durability of catalysts 
Author
Japanese: Azhagumuthu Muthukrishnan, 難波江 裕太, 早川 晃鏡, 岡島 武義, 大坂 武男.  
English: Azhagumuthu Muthukrishnan, Yuta Nabae, Teruaki Hayakawa, Takeyoshi Okajima, Takeo Ohsaka.  
Language English 
Journal/Book name
Japanese: 
English:Catalysis Science & Technology 
Volume, Number, Page Vol. 5    No. 1    pp. 475-483
Published date 2015 
Publisher
Japanese: 
English:The Royal Society of Chemistry 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.1039/C4CY01001A
 
DOI https://doi.org/10.1039/C4CY01001A
Abstract The ORR activity and durability of Fe-containing non-precious N-doped carbon catalysts in acidic medium were studied using a rotating ring-disk electrode voltammetry and XPS technique. The catalysts (Fe/PI) were synthesised from the pyrolysis of the Fe(acac)3 and polyimide nanoparticle (PI) mixture. The catalytic activity and durability of Fe/PI are superior to that of the conventional phthalocyanine-based catalyst. The onset potential of ORR was 0.915 V vs. RHE in 0.5 M H2SO4 which is very close to that of a commercially available Pt/C catalyst. The Fe/PI catalyst sustains its activity and stability even after 11 110 repeating potential steps between 0.6 and 1.0 V vs. RHE in O2-saturated 0.5 M H2SO4 and 1110 potential cycles between 1.0 and 1.5 V vs. RHE in argon-saturated 0.5 M H2SO4, respectively. The kinetic and mechanistic analyses of the ORR on this catalyst indicate that the ORR, as a whole, follows a 4-electron (parallel) pathway. The N 1s XPS spectra before and after the durability test indicate that pyridinic and graphite-like nitrogens take part in improving the ORR activity, whereas nitrogen oxides have a negative role in the ORR. The loss of ORR activity was observed after the acid washing of the catalysts, which suggests the role of Fe in the overall 4-electron reduction of O2.

©2007 Institute of Science Tokyo All rights reserved.