Fig. 4

LSV curves of Pt/C and NiO–CuO/G cathodes in O2-saturated 50 mM PBS at 25 °C (scan rate = 10 mV s−1 and rotation rate = 1200 rpm)
LSV curves of Pt/C and NiO–CuO/G cathodes in O2-saturated 50 mM PBS at 25 °C (scan rate = 10 mV s−1 and rotation rate = 1200 rpm)