New catalyst cuts iridium use by 80% for cheaper green hydrogen

Researchers at Rice University have developed a novel catalyst that reduces iridium usage in proton exchange membrane (PEM) electrolyzers by over 80%, a breakthrough that could significantly lower the cost and improve the scalability of green hydrogen production. Iridium, a rare and expensive metal essential for current PEM electrolyzers due to its durability in acidic water-splitting environments, poses a major supply and economic challenge for expanding hydrogen fuel technologies. The new catalyst, named Ru₆IrOₓ, embeds iridium atoms within a ruthenium oxide lattice rather than coating the surface, enhancing stability by protecting ruthenium atoms from dissolution under harsh electrochemical conditions. The Ru₆IrOₓ catalyst demonstrated industrial-grade performance by sustaining a current density of 2 amperes per square centimeter for over 1,500 hours with minimal degradation, matching the activity of pure iridium catalysts while drastically reducing iridium content. Industrial tests confirmed its durability and efficiency, suggesting that durable PEM electrolyzers can be produced