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Fig. 6 | Nano-Micro Letters

Fig. 6

From: Ultrasonic Plasma Engineering Toward Facile Synthesis of Single-Atom M-N4/N-Doped Carbon (M = Fe, Co) as Superior Oxygen Electrocatalyst in Rechargeable Zinc–Air Batteries

Fig. 6

a Linear scan voltammetry (LSV) curves, b Half-wave potential and onset potential and, c Tafel slopes of Co-N4/NC, Fe-N4/NC, NC, and Pt/C for ORR in O2-saturated 0.1 M KOH solution at 1600 rpm with 5 mV s−1. d Electrochemical impedance spectroscopy (EIS) measurements of Co-N4/NC, Fe-N4/NC, and NC. e EIS of Co-N4/NC fresh and after 100 cycles. f ORR polarization curves of Co-N4/NC and Pt/C before and after 3000 cycles. g LSV polarization curves and h Tafel slopes for OER of Co-N4/NC, Fe-N4/NC, and Ru/C. i LSV polarization curves of different catalysts for ORR/OER in O2-saturated 0.1 M KOH solution at 1600 rpm with 5 mV s−1

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