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Fig. 7 | Nano-Micro Letters

Fig. 7

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. 7

a Stable adsorption configuration of OER and ORR intermediates on NC and M-N4/NC. b Calculated free energy landscape for OER and ORR on NC (green), Co-N4 (blue) and Fe-N4 (red)—embedded graphene at U = 0 V (left) and 1.23 V (right). c Structure of OH*, O*, OOH* adsorbed M-N4 and the mechanisms in OER/ORR processes. The gray, blue, green, red, and yellow sphere are C, N, M (Fe, Co), O, and H atoms

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