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The auxiliary electrode may be isolated from the working electrode using a glass frit. Such isolation prevents any byproducts generated at the auxiliary electrode from contaminating the main test solution: for example, if a reduction is being performed at the working electrode in aqueous solution, oxygen may be evolved from the auxiliary electrode.
Potential as a function of time for anodic stripping voltammetry Three-electrode setup: (1) working electrode; (2) counter electrode; (3) reference electrode. Voltammetry experiments investigate the half-cell reactivity of an analyte. Voltammetry is the study of current as a function of applied potential. These curves I = f(E) are called ...
The working electrode is one of the electrodes at which the oxidation/reduction reactions occur—the processes that occur at this electrode are the ones being monitored. The auxiliary electrode (or counter electrode) is the one at which a process opposite from the one taking place at the working electrode occurs.
The rate of voltage change over time during each of these phases is known as the scan rate (V/s). In a standard three-electrode cell, the potential is measured between the working electrode and the reference electrode, while the current is measured between the working electrode and the counter electrode.
It is the electrode that completes the circuit of the three-electrode cell, as it allows the passage of current. It enables the analysis of processes in which electronic transfer takes place. Screen-printed electrode with the three electrode system, reference electrode (RE), working electrode (WE) and auxiliary or counter electrode (AE or CE)
Screen-printed electrode with some of the different types of SEC measurements (absorption, emission, Raman scattering). The figure shows a system of three electrodes: the central disc, corresponding to the working electrode; the semicircle with the largest arc, corresponding to the auxiliary or counter electrode; and the semicircle with the ...
In electrochemistry, the working electrode is the electrode in an electrochemical system on which the reaction of interest is occurring. [ 1 ] [ 2 ] [ 3 ] The working electrode is often used in conjunction with an auxiliary electrode , and a reference electrode in a three-electrode system .
A potentiostat is a control and measuring device. It comprises an electric circuit which controls the potential across the cell by sensing changes in its resistance, varying accordingly the current supplied to the system: a higher resistance will result in a decreased current, while a lower resistance will result in an increased current, in order to keep the voltage constant as described by ...