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Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation

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Abstract

High surface area carbon-supported Pt, PtRh, and PtSn catalysts were synthesized by microwave-assisted polyol procedure and tested for ethanol oxidation in perchloric acid. The catalysts were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning tunnelling microscopy (STM), TEM, and EDX techniques. STM analysis of unsupported catalysts shows that small particles (∼2 nm) with a narrow size distribution are obtained. TEM and XRD examinations of supported catalysts revealed an increase in particle size upon deposition on carbon support (diameter ∼ 3 nm). The diffraction peaks of the bimetallic catalysts in X-ray diffraction patterns are slightly shifted to lower (PtSn/C) or higher (PtRh/C) 2θ values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation. Oxidation of ethanol is significantly improved at PtSn/C with the onset potential shifted for ∼ 150 mV to more negative values and the increase of activity for approximately three times in comparison to Pt/C catalyst. This is the lowest onset potential found for ethanol oxidation at PtSn catalysts with a similar composition. Chronoamperometric measurements confirmed that PtSn/C is notably less poisoned than Pt/C catalyst. PtRh/C catalyst exhibited mild enhancement of overall electrochemical reaction in comparison to Pt/C.

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Acknowledgments

This work was financially supported by the Ministry of Education and Science, Republic of Serbia, Contract No. 172060.

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Authors and Affiliations

  1. ICTM, Department of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade, Serbia

    S. Stevanović, D. Tripković, K. Popović, J. Lović, A. Tripković & V. M. Jovanović

  2. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia

    J. Rogan

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  1. S. Stevanović
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  2. D. Tripković
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  3. J. Rogan
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  4. K. Popović
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  7. V. M. Jovanović
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Correspondence to V. M. Jovanović.

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Stevanović, S., Tripković, D., Rogan, J. et al. Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation. J Solid State Electrochem 16, 3147–3157 (2012). https://doi.org/10.1007/s10008-012-1755-y

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  • DOI: https://doi.org/10.1007/s10008-012-1755-y

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