Journal
ELECTROCHIMICA ACTA
Volume 319, Issue -, Pages 382-389Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.06.174
Keywords
Oxygen reduction reaction; Nabae model; Genuine four-electron pathway; Polyimide nanoparticles; Kinetic constant
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Funding
- New Energy and Industry Technological Development Organization (NEDO), Japan
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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. (C) 2019 Elsevier Ltd. All rights reserved.
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