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).