Differential pulse voltammetry at microdisk electrodes

Expressions for reversible differential pulse (DP) voltammograms at microdisk electrodes were established from experimental results as a function of pulse electrolysis parameters. Three expressions were computed numerically, depending on the electrode radius and varying the pulse interval, τ. They were compared to theoretical and numerical expressions established previously in literature reports for macrodisk and microcylinder electrodes. The other aim of this work was to determine the minimum value of the pulse interval for which DP voltammograms observed at microdisk electrodes are not distorted. It appeared that no distortion is observed even at very short values of τ, meaning that microdisk electrodes are a good alternative to macroelectrodes in order to reduce time analysis in DPV. DP measurements were carried out at platinum electrodes for two reversible reactions: hexacyanoferrate (II) and iodide oxidation reaction.