Figure 13.

(a) Electronic state regulation of ABO₃ perovskite catalyst optimization of number of electrons at Mn e_g orbital and corresponding conductivity (σ) by light doping and hydrogen treatment and (b) OER activity increase with respect to σ and e_g electron filling (inset: Jahn‐Teller distortion promoting oxygen vacancy formation, resulting in optimal Mn e_g filling and better conductivity). Reproduced from Ref. [87] with permission from WILEY‐VCH Verlag GmbH&Co. KGaA, Weinheim, Copyright 2015. (c) PDOS of cobalt in CoOOH (top) and oxygen‐vacant Zn‐CoOOH (bottom) and (d) OER free energy diagram of single‐ and dual‐center models corresponding to CoOOH and Zn−CoOOH. Reproduced from Ref. [104] with permission from Elsevier, Copyright 2018.