Fig. 6

Electrochemical performance of PtM/rG-O nanocomposites. a CV curves of PtM/rG-O nanocomposites measured in 0.1 M HClO₄ solution at a scan rate of 50 mV s⁻¹ at room temperature; b ORR activities of PtM/rG-O nanocomposites measured at a speed of 1600 rpm in O₂-saturated 0.1 M HClO₄ solution at room temperature. The inset in a and b is the ECSA value and mass activity (E _1/2 = 0.5) of PtM/rG-O nanocomposites, respectively