Abstract
The electrooxidation of formic acid on polycrystalline palladium electrodes in sulfuric acid is studied by dc voltammetry and dynamic electrochemical impedance spectroscopy. Impedance spectra with a frequency range of 5 decades with 10 points per decade, obtained with a multi-sine waveform at various scan rates are used to study the mechanism of the electrooxidation on Pd. The use of the dynamic impedance method allows for studying the active electrooxidation at varying potential and surface coverage. We also give some results showing that CO may not be the poisoning species nor present in the electrooxidation pathway.
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