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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.
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 .
To focus on the reaction at the working electrode, the reference electrode is standardized with constant (buffered or saturated) concentrations of each participant of the redox reaction. [1] There are many ways reference electrodes are used. The simplest is when the reference electrode is used as a half-cell to build an electrochemical cell.
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 ...
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)
The auxiliary electrode balances the working electrode, but in order to know how much potential it has to add or remove it relies on the reference electrode. The reference electrode has a known reduction potential. The auxiliary electrode tries to keep the reference electrode at a certain reduction potential and to do this it has to balance the ...
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 smallest arc, the reference electrode.
working electrode, counter electrode, reference electrode (standard hydrogen electrode or an equivalent). In case of non-zero net current on the electrode, it is essential to minimize the ohmic IR-drop in the electrolyte, e.g., by positioning the reference electrode near the surface of the working electrode (e.g., see Luggin capillary), or by ...