fig2

Figure 2. (A) The two-step intercalation mechanism of MGS cathode. Reprinted with permission^[83]. Copyright 2018, John Wiley and Sons; (B) Different crystal structures of MnO₂ and the zinc storage mechanisms. Reprinted with permission^[84]. Copyright 2020, John Wiley and Sons; (C) The reaction pathway of Zn-insertion in γ-MnO₂ cathode. Reprinted with permission^[85]. Copyright 2015, American Chemical Society; (D) Cell structure and working mechanism of AZIBs with δ-MnO₂ cathode. Reprinted with permission^[87]. Copyright 2024, John Wiley and Sons. MGS: α-MnO₂/graphene scrolls; AZIBs: aqueous zinc-ion batteries.