530397.fig.0011a
(a)
530397.fig.0011b
(b)
Figure 11: Oxygen reduction activity at 0.9 V plotted in the order of strongest to weakest OH binding energy, and the binding energy of O is also given; both are shown in parenthesis in eV. (a) Ir3Co, (b) Ir-Co cores. The Pt-skin surfaces with an interlayer of Pd show the highest activities in both cases [28].