Fig. 4: Performance evaluation of the Zn-NO₃⁻ battery.

a Schematic diagram of the battery configuration. b Discharge profiles. c OCP, d NH₃ yields and FEs at different current densities, e Charge and discharge curves at varying current densities, f Stability testing of the Zn-NO₃⁻ battery based on Fe₂Co₁/NC as a cathode battery.