Why must electrodes be replaced regularly during the electrolysis of aluminium oxide?

During the electrolysis of aluminium oxide, the electrodes play a crucial role in the process. At the anode, oxygen is generated as a result of the electrolysis. When this oxygen is produced, it reacts with the carbon material of the anodes to form carbon dioxide. This reaction leads to the consumption of the carbon anodes, which means they gradually diminish in size and effectiveness over time. As a result, to maintain the efficiency of the electrolysis and ensure proper functioning of the process, the electrodes need to be replaced regularly.

The formation of carbon dioxide from the reaction between the formed oxygen and the carbon anodes is a significant reason for the wear and tear of the electrodes, emphasizing the need for their frequent replacement during the operation of this process.