Atividade eletrocatalítica de pós-ultrafinos de Pt(1-y) SnyOz preparados pelo processo Pechini para oxidação de etanol / Eletroactivity of ultrafine powders of Pt (1-y) SnyOz prepared by the Pechini process for oxidation of etanol

AUTOR(ES)

Fernando Carmona Simões Lucio

DATA DE PUBLICAÇÃO

2006

RESUMO

In this work, a method for the preparation of eletrocatalysts containing platinum and tin supported on carbon was developed aiming at the ethanol oxidation. This method uses the thermal decomposition of polymeric precursors, known as the Pechini method, for the production of powders with particle size lying in the range of nanometers. Several catalysts were prepared by varying the platinum and tin ratio, as well as the metal and carbon proportion. The eletrocatalysts were characterized by Energy Dispersive X-ray Spectroscopy (EDX), X-ray diffraction (DRX) and Transmission Electron Microscopy (TEM). Our results showed that the method employed in the study produced catalysts with compositions close to the nominal one, with particle size in the order of 5 nm. The electrocatalytic activities of the catalysts were investigated by conventional electrochemistry techniques (cyclic voltammetry and chronoamperometry) and by tests in direct ethanol fuel cells. After the chronoamperometric tests, the ethanol and the products were analyzed by High Performance Liquid Chromatography (HPLC). Results obtained by cyclic voltammetry in the presence of ethanol showed that currents of ethanol oxidation at approximately 0.2 V vs. RHE were achieved and the chronoamperometry results gave evidence of large differences in the electroactivity of the eletrocatalysts. The electrolysis results showed that the main product was acetaldehyde, and that the break of the C-C bond of the ethanol occured in small proportions. The best result in the cell tests was found by using the catalyst PtSnO2/C with a tin / platinum molar ratio of 1:9 and 30% (mass) metal loading in relation to carbon. The power density obtained in this case was approximately 72 mW cm-2.

ASSUNTO(S)

direct ethanol fuel cell ptsn/c pechini eletrooxidação de etanol células a combustível a etanol direto pechini ptsn/c

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