Breakthrough in Iridium Nanocluster Synthesis Enhances Green Hydrogen Production

A research collaboration involving Tohoku University, Tokyo University of Science, Vanderbilt University, and the University of Adelaide has achieved a significant advancement in synthesizing iridium nanoclusters (Ir15 NCs) using a simple method in ambient air. These nanoclusters demonstrate 1.5 times greater mass activity than conventional iridium catalysts and maintain stability for over 20 hours.

The synthesis combines a polyol reduction method with a ligand-exchange technique, using protective molecules to prevent oxidation. The Ir15 NCs, with an average particle size of 0.9 nm, were dispersed on carbon black to create an efficient solid catalyst. This breakthrough has potential implications for reducing iridium usage in water electrolysis systems, crucial for commercializing green hydrogen production.