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].