Influence of Temperature on the Electrocatalytic Oxidation of Aromatic Compounds Adsorbed on Platinum.

摘要

The effect of temperature on the electrocatalytic oxidation of aromatic compounds (1,4-dihydroxybenzene and 1,4-dihydroxynaphthalene) adsorbed on smooth polycrystalline platinum in aqueous solutions has been investigated. Adsorption occurred spontaneously when the clean platinum surface was immersed into aqueous solutions of the aromatic compounds. Analytical measurements were made by using thin-layer electrochemical methods. As the temperature was raised from 5 to 65 C, the extent of oxidation of species bound in the edgewise orientation was increased considerably, in contrast to that of species attached in the flat orientation, which was nearly constant. The oxidation data suggest that CO2 is the principal product from flat-adsorbed species at or above room temperature but that the product distribution from edge-oriented intermediates is a sensitive function of temperature.