Browse Publications Technical Papers 2005-01-4078
2005-11-22

Ethanol Fuel Cell: New Electrocatalysts Systems 2005-01-4078

As Células a Combustível a Etanol Direto têm diversas barreiras a serem sobrepujadas. Umas dessas barreiras corresponde ao desenvolvimento de um sistema eletrocatalítico menos sensível à contaminação por CO. Neste trabalho foram investigados os sistemas catalíticos PtU e PtRuDy na oxidação direta de etanol.
O sistema eletrocatalítico PtRuDy apresentou um bom desempenho eletrocatalítico, mas, uma degradação após a operação com etanol da ordem de 46%. O sistema catalítico PtU após a sua utilização com etanol não apresentou degradação no desempenho do catalisador.
Ethanol fuel cell has major drawbacks to be overcame. Electrocatalysts systems are one of the major concerns in the development of ethanol fuel cells. In this work we synthesized two different systems: PtRuDy and PtU. PtRuDy shows electroactivities similar to Pt3Sn, that is pointed out as the best catalyst for ethanol oxidation. PtU shows a promise result when operated with ethanol and after this with hydrogen and oxygen again. It is well established that electrocatalysts systems as PtRu when operated with alcohols these systems shows a huge degradation when operating with hydrogen again. PtRuDy system shows 46% of degradation while operating with ethanol and turning back to hydrogen. PtU system shows no degradation at all after operating with ethanol 1.0 mol L-1 and turning to hydrogen again.

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