Capacitive phenomena at electrochemical interfaces
Electrochemistry: laws governing processes

The existence of capacitive phenomena in an electrochemical cell is particularly responsible for the observation of a current in circumstances where no electrochemical reaction is taking place. The origin of this current, which differs from the electrolysis current (which is also called faradic, because the process giving rise to it obeys Faraday's law), is the electrical behavior of the electrode/electrolyte interface, where charge accumulates on either side of the interface, like a charged capacitor.