530397.fig.0017a
(a)
530397.fig.0017b
(b)
Figure 17: (a) Polarization curves for the ORR on a Pt monolayer covered annealed-Pd3Fe(111) (red), annealed-Pd(111) (green), and Pt(111) surfaces (black) at 1600 rpm in oxygen-saturated 0.1 M HClO4 at room temperature; scan rate: 20 mV s−1. (b) The bar plot for the comparison of ORR-specific activities of the corresponding three surfaces at 0.9 V (RHE) [47].