fig2

Figure 2. Electrochemical performance of ZP and ZP@CuC₂O₄ electrodes. (A) Rate performance of Zn//Zn symmetric cells under stepwise current-density variation; (B) Galvanostatic cycling of Zn//Zn symmetric cells at 1 mA cm^-2/1 mAh cm^-2 at room temperature; (C) Galvanostatic cycling of Zn//Zn symmetric cells at 7 mA cm^-2/1 mAh cm^-2 at room temperature; (D) Galvanostatic cycling of Zn//Zn symmetric cells at 10 mA cm^-2/1 mAh cm^-2 at room temperature; (E) Galvanostatic cycling of Zn//Zn symmetric cells at 40 °C and 0.5 mA cm^-2/0.25 mAh cm^-2; (F) Comparison of the cycling durability achieved in this work with previously reported surface-modified zinc electrodes; (G) Coulombic efficiency of Zn//Cu cells at 0.2 mA cm^-2/0.1 mAh cm^-2; (H) Coulombic efficiency of Zn//Cu cells at 1 mA cm^-2/0.5 mAh cm^-2. CE: Coulombic efficiency; ZP: zinc powder; CB: carbon black; rGO: reduced graphene oxide; CNT: carbon nanotube; MXene: two-dimensional transition-metal carbides, nitrides, and carbonitrides.