Fig. 1: High-throughput DFT screening of different metalloporphyrins.

a Periodic table with the color of each metal element representing the formation energy of different metalloporphyrins. b Free-energy diagram for 2e-ORR at U = 0.70 V and (inset) the optimal adsorption configuration of *OOH on cobalt porphyrin. c ΔG*OOH as a function of the Bader charge on the metal center of different metalloporphyrins and (inset) the charge density distribution of cobalt porphyrin. d PDOS for *OOH adsorbed on cobalt porphyrin. e 2D map showing the thermodynamic limiting potential of different metalloporphyrins for 2e-ORR and 4e-ORR.