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Methanol Oxidation in Alkaline Medium Using PtIn/C Electrocatalysts

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Abstract

Pt/C and PtIn/C with atomic ratios of 90:10, 70:30, and 50:50 were investigated for methanol electro-oxidation in alkaline media by using cyclic voltammetry (CV), chronoamperometry (CA), and direct methanol alkaline fuel cell (DMAFC). All electrocatalysts were synthesized using sodium borohydride method with 20 wt% of metals loading on carbon. X-ray diffraction (XRD) analysis revealed that bimetallic PtIn had faced centered cubic structure and, also, confirmed alloy formation for PtIn/C nanoparticles. Transmission electron micrographs showed metal nanoparticles with average particle size between 3.0 and 5.0 nm; however, the particle size increases when the In content was increased in PtIn/C. In the CV experiments, the onset potential of methanol electro-oxidation shifted to lower values as the indium content increased. Chronoamperometry experiments and direct methanol alkaline fuel cell suggested PtIn/C (70:30) as the most promising material for methanol electro-oxidation: this result could be explained by the presence of Pt and In in close contact (electronic effect) as the occurrence of oxy-hydroxy interactions.

Chronoamperometry curves for PtIn/C electrocatalysts at 25 °C.

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Acknowledgments

The authors thank the Laboratório de Microscopia do Centro de Ciências e Tecnologia de Materiais (CCTM) for TEM measurements and FAPESP (2014/09087-4), 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, 2252 Cidade Universitária, CEP 05508-900, São Paulo, SP, Brazil

    M. C. L. Santos, S. G. da Silva, E. V. Spinacé & A. O. Neto

  2. Bioscience Institute, Coastal Campus, São Paulo State University, 11380-972, São Vicente, SP, Brazil

    C. A. Ottoni

  3. Department of Chemistry, Federal University of Amazonas, 69077-000, Manaus, AM, Brazil

    R. F. B. de Souza

  4. UFSCar—Campus Lagoa do Sino, Centro de Ciências da Natureza, Universidade Federal de São Carlos, Rodovia Lauri Simões de Barros, Km 12, CEP 18290-000, Buri, SP, Brazil

    M. H. M. T. Assumpção

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  1. M. C. L. Santos
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  3. R. F. B. de Souza
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Correspondence to A. O. Neto.

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Santos, M.C.L., Ottoni, C.A., de Souza, R.F.B. et al. Methanol Oxidation in Alkaline Medium Using PtIn/C Electrocatalysts. Electrocatalysis 7, 445–450 (2016). https://doi.org/10.1007/s12678-016-0324-z

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  • DOI: https://doi.org/10.1007/s12678-016-0324-z

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