Fig. 3.

Electrochemical performances of NMOH electrode. a Working principle of an aqueous ZIB with NMOH as the cathode and Zn foil as the anode. b CV curves of coin-type Zn/NMOH cell with the aqueous electrolyte of 2 M ZnSO₄ and 0.2 M MnSO₄ at a scan rate of 0.1 mV s⁻¹. c Galvanostatic charge/discharge profiles of the Zn/NMOH cell tested between 0.8 and 1.9 V with different current densities. d Rate performances of NMOH electrode at current densities between 200 and 1500 mA g⁻¹. e Long-cycling performances of NMOH electrode at 500 mA g⁻¹