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PtSn /C-ITO electrocatalysts were prepared by the sodium borohydride reduction method with 20% mass metallic load supported on Vulcan XC72 carbon and tin and indium oxides (ITO) in the following compositions; 50:50, 70:30 and 90:10. The electrocatalysts were subjected to x-ray diffraction characterization (XRD), transmission electron microscope (TEM), energy dispersive x-ray spectroscopy (EDX) and electrochemical analyzes using cyclic voltammetry and amperometric techniques for studies of ethanol electrochemical oxidation. In the electrochemical techniques the thin porous coating was used where the electrocatalysts were tested in both the acidic and alkaline media. Experiments in unit cell fed directly by ethanol were tested simulating real operating conditions. The electrochemical and physical characterization analyzes in acid medium allowed to compare the performance and stabilities of the electrocatalysts under study and also demonstrated the benefits of the addition of tin and ITO, with emphasis at PtSn/C-ITO 70:30 electrocatalyst. In alkaline media the PtSn/C-ITO 50:50 electrocatalyst demonstrated the best performance in the tests of cyclic voltammetry and amperometry, however, the same efficiency did not happen in the unit cell tests which leads to believe that in alkaline medium the oxidation mechanism of ethanol under temperature and other actual pertinent parameters to cell operation need to be changed and/or studied.

Oxidação do etanol por eletrocatalisador a base de platina e estanho (PtSn/C-ITO) preparados pelo método de redução por borohidreto de sódio