This technique consists of applying a potential across the electrolyte cell and monitoring the resulting change in current or impedance. If the voltage scan rate is infinitesimally small 29 (or dc) the electrochemical process can be considered to be in a steady state. Following considerations are necessary for decoding exact cell geometry.
1. The working and counter electrode should be arranged in a manner that yields uniform current distribution.
2. The reference should be kept very near to the working electrode.
3. The electrode may be considerably purged with hydrogen or other inert gas whenever desirable.
4. The counter electrode and working electrode are sometimes separated by a glass frit to avoid contamination of the electrode environment.
Useful electrochemical data can be obtained by comparing the experimental current versus over potential using Buttler Volmer equation based Kinetic model.