Journal
CHEMSUSCHEM
Volume 6, Issue 6, Pages 1091-1100Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201200847
Keywords
electrochemistry; oxygen; platinum; radicals; surface chemistry
Funding
- European Commission FP7 Initial Training Network ELCAT [214936-2]
- Spanish MICYNN [CTQ2010-16271]
- GV [PROMETEO/2009/045]
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The oxygen reduction reaction (ORR) is undoubtedly the most important fuel-cell cathodic reaction. In this work, a detailed electrochemical analysis of the ORR on Pt(111) in nonadsorbing electrolytes was performed, which included the high-potential region Eup=1.15V while ensuring the electrode surface structure stability. Our results suggest that the reduction of a soluble intermediate species formed during the ORR is the rate-determining step in the whole reaction mechanism. This species does not undergo any other electrochemical reaction at E>0.9V and may accumulate close to the electrode surface. Together with dissolved O2, this intermediate may modify the oxide-growth dynamics on Pt(111). Hence, both species interact with the electrode surface through complex catalytic networks. Under certain experimental conditions, oxygenated species from the oxidation of Pt(111) may enhance the overall ORR current. These results propose an alternative to explain the current state of the art for this fundamental process.
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