fig10

Figure 10. (A) Zn²⁺ storage mechanism for V_O-MnO₂. (B) comparison of adsorption energies for Zn²⁺ on δ-MnO₂ and V_O-MnO₂. (C) cycling performance of V_O-MnO₂ at 0.2 A g^-1. Reproduced with permission^[136]. Copyright 2019, Wiley-VCH. (D) Zn²⁺ storage in Ni-doped MnO₂ regulated by TO distortion. (E) cycling performance of Ni-doped MnO₂ at 4 C. Reproduced with permission^[138]. Copyright 2021, Wiley-VCH. (F) fabrication of N-MnO_2-x@TiC/C arrays. (G) cycling capability of MnO_2-x@TiC/C and N-MnO_2-x@TiC/C at 1.0 A g^-1. Reproduced with permission^[140]. Copyright 2019, Wiley-VCH. (H) structure of A-MnO_2-δ and in-situ XRD patterns during second charge/discharge cycle. (I) cycling performance of A-MnO_2-δ at 1 A g^-1. Reproduced with permission^[141]. Copyright 2020, Elsevier. KMO: K_0.8Mn₈O₁₆; NKMO: Ni_0.052K_0.119Mn_0.948O₂-0.208H₂O.