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A voltammogram (see linear sweep voltammetry) is a graph that measures the current of an electrochemical cell as a function of the potential applied. [9] This graph is used to determine the concentration and the standard potential of the analyte.
The current at the working electrode is plotted versus the voltage at the working electrode to yield the cyclic voltammogram (see Figure 1). Cyclic voltammetry is generally used to study the electrochemical properties of an analyte in solution [ 2 ] [ 3 ] [ 4 ] [ 1 ] or of a molecule that is adsorbed onto the electrode.
The system of this measurement is usually the same as that of standard voltammetry.The potential between the working electrode and the reference electrode is changed as a pulse from an initial potential to an interlevel potential and remains at the interlevel potential for about 5 to 100 milliseconds; then it changes to the final potential, which is different from the initial potential.
Linear potential sweep. In analytical chemistry, linear sweep voltammetry is a method of voltammetry where the current at a working electrode is measured while the potential between the working electrode and a reference electrode is swept linearly in time.
The shape of the semiintegral can be used as an easy method to measure the amount of ohmic drop of an electrochemical cell in cyclic voltammetry.Essentially the semiintegral of a cyclic voltammogram at a planar electrode (an electrode that obeys to the rules of planar diffusion) has the shape of a sigmoid while the original data is gauss-sigmoid convoluted.
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In fast-scan cyclic voltammetry (FSCV), a small carbon fiber electrode (micrometer scale) is inserted into living cells, tissue, or extracellular space. [3] The electrode is then used to quickly raise and lower the voltage in a triangular wave fashion.