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Electrochemical and Fuel Cell Evaluation of PtIr/C Electrocatalysts for Ethanol Electrooxidation in Alkaline Medium

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Abstract

PtIr/C electrocatalysts prepared by borohydride reduction process were characterized by X-ray diffraction, transmission electron microscopy, and cyclic voltammetry. The X-ray diffraction measurements suggested the PtIr alloy formation; furthermore, peaks of IrO2 were not observed; nevertheless, the presence of Ir oxides in small amounts and amorphous forms cannot be discarded. The transmission electron microscopy showed the average particle diameter between 4.0 and 6.0 nm for all compositions prepared. The catalytic activity for ethanol electrooxidation in alkaline medium at room temperature (cyclic voltammetry and chronoamperometry results) showed that PtIr/C (70:30) and PtIr (90:10) exhibited higher performance toward ethanol oxidation than the other electrocatalysts. Experiments using direct ethanol alkaline fuel cell at 75 °C showed PtIr (90:10) as the best electrocatalyst and Ir/C as virtually inactive for ethanol oxidation in real conditions. The best result obtained using PtIr/C may be associated to the electronic effect between Pt and Ir that could decrease the poisoning on catalyst surface and also by the occurrence of bifunctional mechanism.

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Acknowledgments

The authors wish to thank FAPESP (2013/01577-0, 2011/18246-0, 2012/22731-4, 2012/03516-5) and CNPq (150639/2013-9) for the financial support.

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Authors and Affiliations

  1. Instituto de Pesquisas Energéticas e Nucleares, IPEN/CNEN-SP, Av. Prof. Lineu Prestes, 2242 Cidade Universitária, São Paulo, SP, CEP 05508-900, Brazil

    Sirlane G. da Silva, Mônica H. M. T. Assumpção, Rodrigo F. B. de Souza, Guilherme S. Buzzo, Estevam V. Spinacé, Almir O. Neto & Júlio César M. Silva

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  1. Sirlane G. da Silva
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  2. Mônica H. M. T. Assumpção
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  3. Rodrigo F. B. de Souza
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  5. Estevam V. Spinacé
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  6. Almir O. Neto
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Correspondence to Almir O. Neto.

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da Silva, S.G., Assumpção, M.H.M.T., de Souza, R.F.B. et al. Electrochemical and Fuel Cell Evaluation of PtIr/C Electrocatalysts for Ethanol Electrooxidation in Alkaline Medium. Electrocatalysis 5, 438–444 (2014). https://doi.org/10.1007/s12678-014-0213-2

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  • DOI: https://doi.org/10.1007/s12678-014-0213-2

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