Back Cover: A Single‐Atom Iridium Heterogeneous Catalyst in Oxygen Reduction Reaction (Angew. Chem. Int. Ed. 28/2019)

Graphical Abstract Single-atom catalysts combine the advantages of homogeneous and heterogeneous catalysis. In their Research Article on page 9640 ff., Z. Chen et al. describe the design and synthesis of a single-atom iridium catalyst coordinated with four nitrogen atoms (Ir-N-C) to mimic homogeneous iridium porphyrins for high-efficiency oxygen reduction reaction catalysis.