(a)

(b)

Figure 9: Polarization curves of PtML/IrCo/C (a) and PtML/Ir3Co/C (b) with (red curves) and without (black curves) a palladium interlayer in oxygen-saturated 0.1 M HClO4. Scan rate: 10 mV s−1; rotation speed: 1600 rpm [28].