PERFORMANCE OF ELETRODOS Pt / C, Pt3Cr/CE PtCr / C FOR INVESTMENTS IN CATHODES OF THE FUEL CELLS IN METANOL DIRECT / DESEMPENHO DE ELETRODOS Pt/C, Pt3Cr/C E PtCr/C PARA APLICAÇÕES EM CÁTODOS DE CÉLULAS A COMBUSTÍVEL DE METANOL DIRETO

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This work presents oxygem reduction reaction (ORR) studies on platinum (Pt/C) and platinum-chromium alloys containing 50% (PtCr/C) or 70% in chromium (Pt3Cr) dispersed on high surface area, in acid aqueous solutions with and without metanol, with cyclic voltammetry, chronoamperometry and rotating disk electrode techniques. Electrochemical measurements have been also performed in a direct methanol unit fuel cell. The electrocatalysts were characterized by energy dispersive X-ray (EDX) and X-ray diffraction (XRD) analyses. The ORR studies in absence of methanol in solution showed that chromium adittion does not change the reaction mechanism observed on the Pt/C and the electrocatalytic activity increases in the order PtCr/C

ASSUNTO(S)

oxidação de metanol methanol oxidation platinum-chromium oxygen reduction redução de oxigênio quimica analitica platina-cromo

ACESSO AO ARTIGO

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