fig8

Figure 8. (A) Schematic representation of preparation process for MnO₂@NC electrode; (B) SEM images of MnO₂@CC; (C) CV curves at 0.5 mV s^-1; (D) GCD curves at 0.1 A g^-1[102]. This figure is reprinted (adapted) with permission from Li et al. Copyright (2022) Wiley^[102].