ELETROCATALISADORES À BASE DE PLATINA E DIÓXIDO DE MANGANÊS PARA A REAÇÃO DE REDUÇÃO DE OXIGÊNIO EM MEIO ALCALINO NA PRESENÇA DE METANOL

Abstract

The fuel cells (FCs) are seen as an efficient and clean alternative energy source that could replace existing fossil fuel-based technologies for use in portable, stationary devices, as well as vehicles, however, for the commercialization of DMFCs, is one of the major impediments to the passage of methanol from the anode compartment to the cathode occurs through diffusion through the polymer membrane (crossover effect). Thus in order to minimize this effect the present work studied the electrocatalytic activity of Pt-based catalysts and MnO2 front of the oxygen reduction reaction in the absence and presence of methanol in alkaline medium. The physical characteristics of the catalysts were performed by EDX and XRD, the electrochemical properties of the materials were analyzed using the techniques of cyclic voltammetry and scanning linear and according to the results obtained it was found that the catalyst presented the best answer for the oxygen reduction reaction in the presence of methanol was MnO₂(Pt/C) without considerable loss of catalytic activity for ORR even in the presence of methanol.