Ethanol Oxidation on Pt Single-Crystal Electrodes: Surface-Structure Effects in Alkaline Medium

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Title: Ethanol Oxidation on Pt Single-Crystal Electrodes: Surface-Structure Effects in Alkaline Medium
Authors: Busó-Rogero, Carlos | Herrero, Enrique | 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: Alkaline solutions | IR spectroscopy | Oxidation | Platinum | Single-crystal electrodes
Knowledge Area: Química Física
Issue Date: 21-Jul-2014
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Citation: ChemPhysChem. 2014, 15(10): 2019-2028. doi:10.1002/cphc.201402044
Abstract: Ethanol oxidation in 0.1 M NaOH on single-crystal electrodes has been studied using electrochemical and FTIR techniques. The results show that the activity order is the opposite of that found in acidic solutions. The Pt(111) electrode displays the highest currents and also the highest onset potential of all the electrodes. The onset potential for the oxidation of ethanol is linked to the adsorption of OH on the electrode surface. However, small (or even negligible) amounts of COads and carbonate are detected by FTIR, which implies that cleavage of the C[BOND]C bond is not favored in this medium. The activity of the electrodes diminishes quickly upon cycling. The diminution of the activity is proportional to the measured currents and is linked to the formation and polymerization of acetaldehyde, which adsorbs onto the electrode surface and prevents further oxidation.
Sponsor: This work has been financially supported by the MCINN-FEDER (Spain) and Generalitat Valenciana through projects CTQ 2010-16271 and PROMETEO/2009/045 respectively.
ISSN: 1439-4235 (Print) | 1439-7641 (Online)
DOI: 10.1002/cphc.201402044
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 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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