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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 ...
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 ...
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.
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.
Potentiometry passively measures the potential of a solution between two electrodes, affecting the solution very little in the process. One electrode is called the reference electrode and has a constant potential, while the other one is an indicator electrode whose potential changes with the sample's composition. Therefore, the difference in ...
The auxiliary electrode often has a surface area much larger than that of the working electrode to ensure that the half-reaction occurring at the auxiliary electrode can occur fast enough so as not to limit the process at the working electrode. When a three-electrode cell is used to perform electroanalytical chemistry, the auxiliary electrode ...
Most experiments involve a three electrode setup but the setup configuration varies widely. All cell configurations create a laminar flow of solution across the working electrode(s) producing a steady-state current determined by solution flow rather than diffusion. The resulting current can be mathematically predicted and modeled.
Three-electrode system. It contains a working electrode, a reference electrode and an auxiliary electrode. This system can be simplified by using screen-printed electrodes that include all three electrodes in a single holder. [3] Spectroelectrochemical cell (SEC cell). It is the device that includes the three-electrode system and allows the ...