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Catalysts 2019, 9(3), 277; https://doi.org/10.3390/catal9030277

Catalysts of PtSn/C Modified with Ru and Ta for Electrooxidation of Ethanol

Departamento de Química, Universidade Federal do Espírito Santo, Av. Fernando Ferrari, 29075-910 Vitória, Brasil
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Received: 5 February 2019 / Revised: 7 March 2019 / Accepted: 9 March 2019 / Published: 18 March 2019
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Abstract

PtSn/C-type catalysts modified with Ta and Ru were prepared by the thermal decomposition of polymeric precursors with the following nominal compositions: Pt70Sn10Ta20/C, Pt70Sn10Ta15Ru5/C, Pt70Sn10Ta10Ru10/C and Pt70Sn10Ta5Ru15/C. The physicochemical characterization was performed by X-ray diffraction (XRD) and energy dispersive X-ray (EDX). The electrochemical characterization was performed using cyclic voltammetry, chronoamperometry and fuel cell testing. PtSnTaRu/C catalysts were characterized in the absence and presence of ethanol in an acidic medium (H2SO4 0.5 mol L−1). All the catalysts showed activity for the oxidation of ethanol. The results indicated that the addition of Ta increased the stability and performance of the catalysts, as the Pt70Sn10Ta20/C catalyst had the maximum power density of 27.3 mW cm−2 in an acidic medium. The results showed that the PtSn/C-type catalysts modified with Ta and Ru showed good performance against alcohol oxidation, representingan alternative to the use of direct ethanol fuel cells. View Full-Text
Keywords: quaternary catalysts; tantalum; fuel cell quaternary catalysts; tantalum; fuel cell
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Queiroz, M.A.R.; Ribeiro, J. Catalysts of PtSn/C Modified with Ru and Ta for Electrooxidation of Ethanol. Catalysts 2019, 9, 277.

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