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Mechanistic studies of oxygen reduction on Fe-PEI derived non-PGM electrocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
45922 46427 2014 8 PDF Available
Title
Mechanistic studies of oxygen reduction on Fe-PEI derived non-PGM electrocatalysts
Abstract

•Systematic mechanistic studies on non-PGM ORR catalyst.•Change of ORR mechanism in alkaline vs. acid was found.•Number of electrons in ORR indicates 2 × 2e− mechanism.

Mechanistic studies of oxygen reduction reaction (ORR) on electrocatalysts derived from the pyrolysis of iron salts and polyethyleneimine (PEI) were performed in acidic and alkaline media. The prepared materials have been characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) surface area analysis, and rotating ring-disk electrode (RRDE) methods. Systematic studies of catalyst loading on working electrode allowed establishing a working range suitable for mechanistic studies. It was found that the overall mechanism of ORR in acid electrolyte is not identical with that in alkaline media indicating complex interplay. The dependence of electron transfer numbers on catalyst loading indicates 2 × 2e− mechanism. The analysis of the Tafel plots corresponding to electrode polarizations have demonstrated difference of the reaction rate limiting steps in alkaline and acid media.

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Keywords
Non-PGM; Cathode catalysts; Fuel cell; Mechanism
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Mechanistic studies of oxygen reduction on Fe-PEI derived non-PGM electrocatalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 179–186
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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