Fig. 4: Investigations of proposed OER pathway.
From: Lattice oxygen activation enabled by high-valence metal sites for enhanced water oxidation
a Free energy comparation between OH− adsorption and lattice hydroxyl deprotonation in different models. b Free energy diagram of OER cycling at Fe–Ni dual-site on (FeCoCrNi)OOH model. c The determined ΔG of RLS via LOM and AEM pathway in different models. d The determined current densities of various catalysts at 1.5 V versus RHE under different pH values. e The detected MS signals of generated oxygen molecule using 18O isotope-labelled catalysts. The signals are normalized through initializing the intensity of 16O2 as 1000 a.u. f Schematic illustration of the proposed overall OER pathway for EA-FCCN catalyst. The black and blue oxygen atoms represent lattice and adsorbed oxygen, respectively.
