fig5

Figure 5. Performance of the rechargeable Zn-air battery: (A) Schematic diagram showing the assembly process of the rechargeable Zn-air battery; (B) Discharge polarization curves and corresponding power density plots for the Zn-air battery with Fe₃₀Co₃₀Ni₃₀-PNC and Pt/C–RuO₂ couples as the air electrodes; (C) Specific capacities normalized to Zn mass at a current density of 10 mA·cm^-2; (D) Discharge/charge cycling curves for the Zn-air battery using Fe₃₀Co₃₀Ni₃₀-PNC and Pt/C–RuO₂ couples as air electrodes at a current density of 10 mA·cm^-2. PNC: Phosphorus and nitrogen doped carbon.