Figure 1. (IMAGE) Science China Press Caption Metal-normalized activity and mass-specific activity of Ir/MoC catalysts with different Ir content. Ir1 stands for atomically dispersed Ir. The shade highlights that when Ir loading is lower than 4%, the dominant species are Ir1, while it gradually changes the mixture of Ir1, Ir clusters and Ir nanoparticles at higher Ir loading. Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.