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(a) Comparative LSV curves of N-GQDs/MoS2-, N-GQDs/rGO-, MOS2–rGO-, and N-GQDs/MoS2–rGO-modified electrodes in the presence of O2-saturated 0.1 M KOH at 1600 rpm with a scan rate of 10 mV/s, LSV obtained for (b) N-GQDs/MoS2-, (c) N-GQDs/rGO-, and (d) MoS2–rGO electrocatalyst-modified electrode in the presence of O2-saturated 0.1 M KOH solution at various rotation speeds in the range of 400–2500 rpm.
