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(a) CVs of the N-GQDs/MoS2–rGO nanohybrid before and after 3000 cycles with a scan rate of 20 mV/s in the O2-saturated 0.1 M KOH solution and (b) ORR polarization curves of the N-GQDs/MoS2–rGO nanohybrid before and after 3000 cycles with a scan rate of 10 mV/s and rotation rate of 1600 rpm in the O2-saturated 0.1 KOH solution. Comparative CVs of (c) N-GQDs/MoS2–rGO and (d) commercial Pt/C catalyst in the presence and absence of 3 M methanol, with a sweep rate of 100 mV/s in 0.1 M KOH.
