A “Smart” Catalyst: Sinter‐Resistant Supported Iridium Clusters Visualized with Electron Microscopy

Like billiard balls: Atomic-scale observations by electron microscopy of supported iridium nanoclusters show that the nanoclusters aggregate to reach a critical diameter of approximately 1 nm and then resist further aggregation (see picture). The observations highlight the potential for this catalyst to assemble into clusters that may be nearly optimum for catalytic activity.