New Insights into the Oxygen Reduction Reaction Mechanism on Pt (111): A Detailed Electrochemical Study

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Title: New Insights into the Oxygen Reduction Reaction Mechanism on Pt (111): A Detailed Electrochemical Study
Authors: Gómez Marín, Ana María | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Electrochemistry | Oxygen | Platinum | Radicals | Surface chemistry
Knowledge Area: Química Física
Issue Date: Jun-2013
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Citation: ChemSusChem. 2013, 6(6): 1091-1100. doi:10.1002/cssc.201200847
Abstract: 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=1.15 V 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>0.9 V 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.
Sponsor: This study has been carried out in the framework of the European Commission FP7 Initial Training Network “ELCAT”, Grant Agreement No. 214936-2. Support from the Spanish MICYNN though project CTQ2010-16271 and GV through PROMETEO/2009/045 (FEDER) are gratefully acknowledged.
ISSN: 1864-5631 (Print) | 1864-564X (Online)
DOI: 10.1002/cssc.201200847
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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