Iridium catalysts are prominently used in several industrial and environmental applications. One of the most notable is the water splitting process, where iridium oxide is employed as a catalyst for the oxygen evolution reaction (OER). This reaction is crucial for producing hydrogen fuel via electrolysis. Additionally, iridium complexes are used in carbon-carbon and carbon-nitrogen bond formation reactions, such as in C-H activation, which is significant in the synthesis of pharmaceuticals and fine chemicals.