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- Three-electrode system + (A '''three-electrode system''' is the setu … A '''three-electrode system''' is the setup used in the [[Q-Sensor]], which is an integral part of the [[Q-Module]]. This system is used in voltammetry (including [[cyclic voltammetry]]) to study the current as a function of the applied potential using three different electrodes: 1) the working electrode 2) the reference electrode, and 3) the counter electrode. In the [[Q-Sensor]], the working or detecting electrode is a glassy carbon (GC) electrode that is set to a given potential and makes contact with the analyte. The potential of the working electrode is controlled by the constant potential of the a silver/silver chloride (Ag/AgCl) reference electrode, which does not pass any current. The applied potential on the surface of the GC should be sufficient to either oxidize reduced analyte (in this case [[Coenzyme Q]]) or to reduce oxidized analyte. Thus, the counter electrode is a platinum electrode (Pt) that passes a current to counter these redox events by completing the circuit that is rate-limited by electron transfer on the GC. To determine the reduced Q fraction the GC electrode is set at the oxidation peak potential, which can be determined with [[cyclic voltammetry]].[[cyclic voltammetry]].)
