fig4
Figure 4. (A) Phase evolution of MnO2; This figure is reprinted (adapted) with permission from Huang et al. Copyright (2019) Oahost[72]. (B) Phase evolution of cathode; (C) Contour graph of in situ XRD data. This figure is reprinted (adapted) with permission from Gao et al. Copyright (2020) Wiley VCH[54].
