Comparisons in Voltammetry of Phenylenediamine Based Ureas on Platinum and Glassy Carbon Working Electrodes
In this study it was sought to observe possible differences in voltammetry of the phenylenediamine based urea system using different working electrode surfaces, in this case: platinum and glassy carbon working electrodes. Differences in voltammetry were observed between platinum and glassy carbon in methylene chloride. These differences appear to be due to faster heterogeneous electron transfer on glassy carbon than on platinum. In order to further explore this faster rate of electron transfer that is observed on glassy carbon, the working electrode surface was methylated, intentionally disrupting the electrode surface. The resulting voltammetric behavior of the phenylenediamine based urea system using this compromised electrode was similar to that of platinum, suggesting that the rate of electron transfer on glassy carbon was slowed down.
Further voltammetric experiments are being conducted in other solvents due to the solvent-dependence of the phenylenediamine based urea system. Possible differences in voltammetry between platinum and glassy carbon electrodes are currently being explored in dimethyl sulfoxide.