530397.fig.0010a
(a)
530397.fig.0010b
(b)
Figure 10: Comparison of the mass activity in terms of Pt mass, (Pt + Pd) mass and the platinum-group-metal’s mass (a) and the surface-area activity (b) at 0.9 V (RHE) of PtML/IrCo/C (blue) and PtML/PdML/IrCo/C for oxygen reduction. The activity of Pt/C, the commercial catalyst, is shown in black [28].