Figure 4 (a) Density functional theory (DFT) calculated adsorption energies for H2O and O2 on the Pt sites of (100), (110) and (111) surface. (b) Density functional theory (DFT) calculated adsorption energies for H2O and O2 on the CoOOH sites of (003), (012) and (101) surface. (c) Schematic illustration of the proposed synergistic mechanism of ORR on Pt-SMO-Co2N NWs, including the dissociative reduction of O2 at the Pt site, the proton mediation by the CoOOH site, and the surface proton transfer in between (reactions I and II).