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Fig. 8 | Nano-Micro Letters

Fig. 8

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. 8

a Schematic of zinc–air battery. b Open cell voltage (OCV) of two-connected Zn–air battery. c Specific discharging capacities at 20 mA cm−2. d Discharging polarization and power density curves based on the Co-N4/NC and Pt/C-Ru/C catalyst. e Cycling test (100 cycles) at a current density of 10 mA cm−2 with Co-N4/NC and Pt/C-Ru/C catalyst. f Images of two homemade rechargeable Zn–air batteries in series with a LED

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