Cyclic Voltammetry (CV), also known as Cyclic Polarization, is the most popular technique for electrochemist. It provides fast information about a system, allows to introduce a time scale and often the results are very visual.
A voltammetry is a technique where the potential is changed and the current is measured. Afterwards the current is plotted versus the potential to create a voltammogram.
A cyclic voltammogram consists of two linear sweeps of the working electrodes potential with two opposed slopes. The slope of the sweeps is equal except for the direction (- / +) and is called Scan Rate. CV is also known as cyclic polarization and could be described as two polarization curves.
The Cyclic Voltammogram is then the plot the two sweep’s current versus the potential.
Understanding capacitive charging current is important for understanding electrochemical experiments, so in this section the origin and equations for capacitive charging current will be explained. Afterwards the effect of capacitive current during Cyclic Voltammetry and Linear Sweep Voltammetry is discussed. Usually electrochemists are interested in the Faraday current that is the current caused by an …