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Effect of the degree of alloying of PtRu/C (1:1) catalysts on ethanol oxidation

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Abstract

The effect of alloying degree on the ethanol oxidation activity of a PtRu/C catalyst with a Pt/Ru atomic ratio of 1:1 was investigated by measurements in a half-cell and in a single direct ethanol fuel cell. The increase of the amount of Ru alloyed from one third to two thirds of the total Ru content in the catalyst clearly resulted in a decrease of the ethanol oxidation activity. As the amount of the highly active hydrous ruthenium oxide was near the same, the lower activity of the PtRu/C catalyst with higher alloying degree was mainly ascribed to the presence of an excessive number of Ru atoms around Pt active sites, hindering ethanol adsorption on Pt sites. The reduced ethanol adsorption could be also related to the decreased Pt–Pt bond distance and to the electronic effects by alloying.

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Acknowledgments

The authors thank the Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP, Proc. 2010/20045-0) for the financial assistance to the project. F.I. Pires (Proc. 160503/2011-6) and P.G. Corradini (Proc. 131469/2011-8) thank the CNPq for the fellowships granted. The authors wish to thank the Brazilian Synchrotron Light Laboratory (LNLS) for assisting with the XPS measurements (Project SXS-13594).

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Authors and Affiliations

  1. Instituto de Química de São Carlos, USP, C.P. 780, São Carlos, SP, 13560-970, Brazil

    Felipe I. Pires, Patricia G. Corradini, Valdecir A. Paganin & Joelma Perez

  2. Scuola di Scienza dei Materiali, Via 25 Aprile 22, 16016, Cogoleto, Genoa, Italy

    Ermete Antolini

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  1. Felipe I. Pires
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  2. Patricia G. Corradini
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  3. Valdecir A. Paganin
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  4. Ermete Antolini
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  5. Joelma Perez
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Correspondence to Ermete Antolini.

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Pires, F.I., Corradini, P.G., Paganin, V.A. et al. Effect of the degree of alloying of PtRu/C (1:1) catalysts on ethanol oxidation. Ionics 19, 1037–1045 (2013). https://doi.org/10.1007/s11581-012-0822-9

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  • DOI: https://doi.org/10.1007/s11581-012-0822-9

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