fig10
Figure 10. (A) Free energy diagrams at 1.23 V for ORR over three types of active sites of Fe-N4, Fe-N4/Fe4-N6, and Fe-N4-OH/Fe4-N6. (B) Schematic ORR process on the Fe-N4 site of Fe-N4/Fe4-N6. (C) Fe-N radical distribution function of the Fe-N4 site in the models of Fe-N4 near Fe4N6 and bare Fe-N4 site at 25 °C and 80 °C. These figures are quoted with permission from Wan et al.[72].
