• Huang, J.; Li, M.; Eslamibidgoli, M. J.; Eikerling, M.; Groß, A. Cation Overcrowding Effect on the Oxygen Evolution Reaction. JACS Au 2021, 1, 1752-1765. Application of the hierarchical framework to the oxygen evolution reaction with a focus on cation effects. The observed decrease in activity with increasing effective size of cations was interpreted as a consequence of cation overcrowding near negatively charged electrode surface.