Iridium-carbon catalysts are widely used in fuel cells, for the electrochemical reaction of hydrogen and oxygen, to promote the efficient operation of the battery. Its high activity and stability make it an ideal catalyst for fuel cell anodes and cathodes. In the process of hydrogen production by PEM electrolysis, iridium carbon catalyst can be used to promote PEM electrolysis and increase the yield of hydrogen. This has potential applications in the field of renewable energy and helps to achieve clean energy production. Iridium-carbon catalysts can also be used for other electrochemical reactions, such as electrolysis of carbon dioxide to produce carbon monoxide. These reactions have important applications in energy conversion and storage, environmental protection, etc.