fig4
![Recent development in addressing challenges and implementing strategies for manganese dioxide cathodes in aqueous zinc ion batteries](https://image.oaes.cc/d5959b56-cecc-4c5d-aa21-b59c15b140b6/em30119.fig.4.jpg)
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].