fig4

Figure 4. (A) CV curves of M-C₃N₄-x//Zn based ZIHSCs at 2 mV·s^-1; CV curves of M-C₃N₄-2//Zn ZIHSC (B) at 2 mV·s^-1 (first 5 cycles), (C) 2~100 mV·s^-1, and (D) 100~1,000 mV·s^-1. CV: Cyclic voltammetry; ZIHSCs: zinc-ion hybrid supercapacitors.