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Title
Japanese:Genuine four-electron oxygen reduction over precious-metal-free catalyst in alkaline media 
English:Genuine four-electron oxygen reduction over precious-metal-free catalyst in alkaline media 
Author
Japanese: Yun Wu, Shinsuke Nagata, Yuta Nabae.  
English: Yun Wu, Shinsuke Nagata, Yuta Nabae.  
Language English 
Journal/Book name
Japanese:Electrochimica Acta 
English:Electrochimica Acta 
Volume, Number, Page Vol. 319        pp. 382-389
Published date July 2, 2019 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://www.sciencedirect.com/science/article/pii/S0013468619313179
 
DOI https://doi.org/10.1016/j.electacta.2019.06.174
Abstract Understanding the kinetics of oxygen reduction reactions (ORRs) over non-precious-metal (NPM) catalysts in alkaline media is quite important for commercializing anion exchange membrane fuel cells. Rotating ring-disk electrode (RRDE) voltammetry has been useful for studying the selectivity of ORR, but typical analytical models might overestimate the four-electron pathway. The present study investigated ORR in alkaline media over Fe/N/C and N/C catalysts, which were prepared by pyrolyzing polyimide nano-particles. The obtained data were analyzed using the novel RRDE theory, which involves the Nabae model to distinguish a genuine four-electron reduction from a quasi-four-electron reduction (two plus two-electron reduction). The results demonstrated that the reduction with the Fe/N/C catalyst proceeded via an inherent four-electron pathway while that with the N/C catalyst prepared by a similar method proceeded majorly via a two-electron pathway.

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