Pt catalysts modified with Bi: Enhancement of the catalytic activity for alcohol oxidation in alkaline media

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Title: Pt catalysts modified with Bi: Enhancement of the catalytic activity for alcohol oxidation in alkaline media
Authors: Figueiredo, Marta C. | Arán-Ais, Rosa M. | Feliu, Juan M. | Kontturi, Kyösti | Kallio, Tanja
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: Platinum catalysts | Alcohol oxidation | Bi adsorption | Alkaline media | Adatoms
Knowledge Area: Química Física
Issue Date: Apr-2014
Publisher: Elsevier
Citation: Journal of Catalysis. 2014, 312: 78-86. doi:10.1016/j.jcat.2014.01.010
Abstract: Recent developments on anion-exchange membranes for fuel cell application renewed the interest in the study of alcohol oxidation at high pHs for applications in anion-exchange membrane direct alcohol fuel cells (AEM-DAFC). Although platinum is still the most studied catalyst for oxidation of alcohols in alkaline media, the introduction of one or more metals in order to increase the oxophilicity of the catalyst is a common approach in the development of improved materials for these reactions. In this manuscript, we report the enhancement of the catalytic activity of Pt/C toward ethanol, methanol, and propanol oxidation in alkaline media by simple adsorption of Bi surface. The activity was checked by cyclic voltammetry, and the reaction products and intermediates were analyzed by “in situ” infrared spectroscopy. The presence of Bi was shown to increase the activity of Pt toward the oxidation of the referred alcohols by acting as a third body (impeding surface poisoning) and also by an electronic effect (on water adsorption at the surface).
Sponsor: Financial support from Aalto University, MICINN (Feder) and Generalitat Valenciana through Projects CTQ2010-16271 and PROMETEO/2009/45.
ISSN: 0021-9517 (Print) | 1090-2694 (Online)
DOI: 10.1016/j.jcat.2014.01.010
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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