An electrode (Electrode) is a conductor or semiconductor that comes into contact with an electrolyte solution or electrolyte, forming a multiphase system.
Electrochemical systems utilize electrodes for the input or output of electrical energy, and electrodes serve as the sites for electrode reactions.
In a typical electrochemical system, there is a three-electrode system comprising a working electrode, a reference electrode, and a counter electrode.
The reference electrode (Reference Electrode, abbreviated as RE) is an electrode with a known potential and close to ideally non-polarizable.
Essentially, no current flows through the reference electrode, and it is used to measure the electrode potential of the working electrode relative to the reference electrode.
Various research systems can choose different reference electrodes. Commonly used reference electrodes include the Ag/AgCl electrode, the saturated calomel electrode, the mercury-mercury oxide electrode, and the mercury sulfate electrode. The selection of the appropriate reference electrode should be based on the electrolyte solution system.