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Activation energy (in eV) and transition state geometry for O2 dissociation on a AgAu(211) stepped surface (a) with Ag atoms in the rows next to the step Au atoms, (b) with a three-atom Ag ensemble, and (c) same as (a) but with coadsorbed O, corresponding to four O vacancies. Color coding: Au, yellow; Ag, gray; O, red. Adapted from ref (53). Copyright 2016 American Chemical Society.
