Fig. 2: Reaction mechanisms and activity map.
From: Synergy of dual-atom catalysts deviated from the scaling relationship for oxygen evolution reaction

a Schematic illustration of the possible conventional adsorbate evolution mechanism (AEM) and O–O coupling mechanism (OCM). b The computed overpotential (η) of the FeM, CoM, NiM, and CuM dimers on M′M@NC.