What are the reasons for the oxidation of graphite electrodes?

The main reasons for the oxidation of graphite electrodes are as follows:

High potential: During the electrolysis process, the graphite electrode is usually at a high potential, which accelerates the reduction reaction of oxygen on the electrode surface, leading to oxidation of the graphite electrode.

Electrolytes: Some electrolytes can oxidize graphite electrodes, such as electrolytes containing fluoride or chloride, which react chemically with graphite under the action of an electric field, leading to the oxidation of graphite electrodes.

Temperature: High temperatures accelerate the oxidation process of graphite electrodes because graphite is more prone to react with oxygen at high temperatures.

Pressure: High pressure can increase the mechanical stress on graphite electrodes, which may cause changes in the microstructure of graphite electrodes, thereby accelerating the oxidation process.

Improper use: Improper operation, such as excessive current density or incorrect electrolyte ratio, can lead to oxidation of graphite electrodes when using them.

Environmental factors: Humidity, pollutants in the air, and other environmental factors may also cause oxidation of graphite electrodes.

Therefore, when using graphite electrodes, it is necessary to strictly control the electrolysis conditions to avoid the factors that may cause oxidation of graphite electrodes, in order to ensure the service life of the electrodes and the stability of the electrolysis process.