Oxygen Electrocatalysis: Symmetry‐Broken Atom Configurations at Grain Boundaries and Oxygen Evolution Electrocatalysis in Perovskite Oxides (Adv. Energy Mater. 34/2018)

In article number 1802481, Sung-Yoon Chung and co-workers demonstrate that grain boundaries (GBs) in LaCoO3 and LaMnO3 are exceptionally active sites for oxygen evolution reaction (OER) electrocatalysis. By using a combination of bicrystal thin films, atomic-scale direct observations, and theoretical calculations, this work elucidates the strong correlation between the symmetry-broken atomic displacements at GBs and the variation of electronic structure to facilitate the charge transfer and thus the OER activity.