Last Updated: 4/30/19 by Neil Spinner
In an electrochemical system,
the anode is the electrode
at which oxidation
The terms anode and cathode
are most frequently used in two-electrode systems,
such as fuel cells
They are less commonly used in typical three-electrode systems.
In the context of fuel cells and batteries, the anode is also sometimes called the negative electrode, and may be denoted with a minus sign. In the context of secondary (rechargeable) batteries where both the anode and cathode may alternatively undergo both oxidation and reduction
(depending on whether the battery is being charged or discharged), the anode is defined as the electrode experiencing oxidation during discharge.