fig9

Figure 9. (A) Nyquist plots with the insets of high-frequency semicircles and corresponding equivalent circuits of K_0.5MnO₂ and K_0.5MnO₂@Al₂O₃ after 10 cycles^[73]. Reprinted with permission from Ref.^[73]. Copyright 2023 Elsevier.^[73] (B) SEM images of the cycled electrodes^[74]. Reprinted with permission from Ref.^[74]. Copyright 2023 Wiley-VCH^[74]. In-situ XRD spectra of (C1) KMCF and (C2) KMCF-P_0.1^[118]. Reprinted with permission from Ref.^[118]. Copyright 2024 Elsevier^[118]. (D) the schematic diagram of the KMTO structure^[119]. Reprinted with permission from Ref.^[119]. Copyright 2024 Elsevier^[119]. (E) HADDF-STEM image of W-KMFMCO, indicative of the phase boundary. Reprinted with permission from Ref.^[62]. Copyright 2024 Wiley-VCH^[62]. (F) The schematic illustration of phase-transition-free CaTiO₃ stabilized KMTO^[115]. Reprinted with permission from Ref.^[115]. Copyright 2024 Springer Nature^[115].