Effect of temperature on the electro-oxidation of ethanol on platinum
AUTOR(ES)
Camargo, Ana Paula M., Previdello, Bruno A. F., Varela, Hamilton, Gonzalez, Ernesto R.
FONTE
Química Nova
DATA DE PUBLICAÇÃO
2010
RESUMO
We present in this work an experimental investigation of the effect of temperature (from 25 to 180 ºC) in the electro-oxidation of ethanol on platinum in two different phosphoric acid concentrations. We observed that the onset potential for ethanol electro-oxidation shifts to lower values and the reaction rates increase as temperature is increased for both electrolytes. The results were rationalized in terms of the effect of temperature on the adsorption of reaction intermediates, poisons, and anions. The formation of oxygenated species at high potentials, mainly in the more diluted electrolyte, also contributes to increase the electro-oxidation reaction rate.
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