ABSTRACT
The functionality of all electrode materials is limited with respect to their potential window available. On the cathodic side, a reduction in the cation of the supporting electrolyte results in large currents, whereas at the anodic side, the oxidation processes with the respective responses-either of the electrode material itself or of the anion of the electrolyte-would overlap the signal of interest. Thus, in voltammetric or amperometric measurements, the analytes can basically be monitored if they are electroactive and their responses obtainable within the operational potential range. Apart from sorption effects, the reactivity of the analyte is then limited mainly to electrochemical transformations at the electrode surface, that is, reactions connected with the electron transfer.
