The methanol and ethylene glycol electrooxidation on palladium electrode in acidic solution has been investigated by cyclic voltammetry and in situ Fourier transform infrared spectroelectrochemistry. It shows that the oxidation of methanol and ethylene glycol at Pd electrode cannot proceed until over 1. 5 V in acidic and neutral media. The overpotential decreases and the peak current density increases with the reduction in pH values. The formation of the oxygen-containing species significantly affects the alcohol oxidation on Pd electrode. The in situ FTIR spectroscopic measurements show that the oxidation products of ethylene glycol on Pd electrode are CO2 and oxalic acid at high potentials and concentrated acid solution. However,the dominant product is CO2 for the oxidation of both methanol and ethylene glycol in acidic and neutral solutions,indicating that the pathway of methanol or ethylene glycol oxidation is a non-poisoning process.


electrocatalysis, Pd, methanol, ethylene glycol, in situ Fourier transform infrared spectroelectrochemistry

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