Fig. 16
From: Hydrogen production from water electrolysis: role of catalysts
(Figure reprinted with permission from Ref. [70])
A (a) Illustration of oxygen vacancy concentration and Co–O bond covalency. (b) Relationship between oxygen vacancies, oxygen diffusivity, and the OER activity. (c) The proposed LOM mechanism (Figure reprinted with permission from Ref. [73]). B Possible OER mechanisms involving concerted proton-electron transfer on surface oxygen sites to yield (a) 34O2(16O18O), and (b) 36O2(18O18O), respectively (Figure reprinted with permission from Ref. [68]). C Volcano plot for OER on some perovskites with AEM and LOM