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(a) Schematic illustration of the Zn-air battery. (b) Discharge and charge cycling curves. (c) Discharging curves at j = 20 mA cm–2. (d) Polarization curves and corresponding power density. (e) Long-term durability test of the Zn-air batteries at j = 2 mA cm–2 assembled with PCN-226(Co) and commercial Pt/C+RuO2. The loading of PCN-226(Co) is 6.25 times the amount that was used in the ORR test.
