Pt catalysts modified with Bi: enhancement of the catalytic activity for alcohols oxidation in alkaline media

Marta Costa Figueiredo, R. Arán-Aís, J.M. Feliu, Kyösti Kontturi, Tanja Kallio

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    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, the reaction products and intermediates were analyzed by “in-situ” infrared spectroscopy. The presence of Bi showed to increase of 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).
    Original languageEnglish
    Pages (from-to)78-86
    Number of pages9
    JournalJournal of Catalysis
    Volume312
    DOIs
    Publication statusPublished - Apr 2014
    MoE publication typeA1 Journal article-refereed

    Keywords

    • platinum catalysts, alcohols oxidation, Bi adsorption, alkaline media, adatoms

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