Influence of Support Material of PtSnNiGa/C Electrocatalysts for Ethanol Oxidation

Santos, Deise Menezes; Paganoto, Giordano T.; Queiroz, Maria Aparecida Ribeiro; Guimarães, Marco César Cunegundes; Ribeiro, Josimar

doi:10.17807/orbital.v9i3.949

Cited by 4 publications

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“…The cyclic voltammetry (CV) of the PtSn/C catalysts modified with Ta and Ru ( Figure 3) show similar behavior to that already presented by Pt-based catalysts on carbon [13,19,33,39]. The hydrogen adsorption/desorption region (−0.1 to 0.2 V vs. Ag/AgCl) is not well defined in relation to the pure Pt CV profile due to the possible formation of Sn oxides/hydroxides, Ru and Ta, which can block the Pt active sites [19,24,40].…”

Section: Electrochemical Characterizationsupporting

confidence: 67%

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

Queiroz

Ribeiro

2019

Catalysts

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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.

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