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Title
Japanese: 
English:Enhancement in Kinetics of the Oxygen Reduction Reaction on a Nitrogen-Doped Carbon Catalyst by Introduction of Iron via Electrochemical Methods 
Author
Japanese: Jiajia Wu, 張 達, Hideharu Niwa, Yoshihisa Harada, 尾嶋 正治, Hironori Ofuchi, 難波江 裕太, 岡島 武義, 大坂 武男.  
English: Jiajia Wu, Da Zhang, Hideharu Niwa, Yoshihisa Harada, Masaharu Oshima, Hironori Ofuchi, Yuta Nabae, Takeyoshi Okajima, Takeo Ohsaka.  
Language English 
Journal/Book name
Japanese: 
English:Langmuir 
Volume, Number, Page Vol. 31    No. 19    pp. 5529-5536
Published date Apr. 2015 
Publisher
Japanese: 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.1021/acs.langmuir.5b00310
 
DOI https://doi.org/10.1021/acs.langmuir.5b00310
Abstract The iron (Fe) electrodeposition?electrochemical dissolution has been employed on nitrogen-doped carbon material (P-PI) prepared via multi-step pyrolysis of a polyimide precursor to achieve the introduction of Fe species, and its influence on the oxygen reduction reaction (ORR) is investigated by cyclic and rotating ring-disk electrode voltammetry in 0.5 M H2SO4. After the electrochemical treatment, the overpotential and H2O2 production percentage of ORR on the P-PI are decreased and the number of electrons transferred is increased in the meanwhile. In combination with the results of X-ray absorption fine structure spectra, the presence of Fe?Nx sites (Fe ions coordinated by nitrogen) is believed to be responsible for the improved ORR performance. Further kinetic analysis indicates that a two-electron reduction of O2 is predominant on the untreated P-PI with coexistence of a direct four-electron transformation of O2 to H2O, while the introduction of Fe species leads to a larger increase in the rate constant for the four-electron reduction than that for the two-electron process, being in good agreement with the view that Fe?Nx sites are active for four-electron ORR.

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