fig8
Figure 8. (A) Schematic illustration of the synthesis process of PCF. (B) schematic of K-ion storage mechanism for CF and PCF. Copyright 2022, Chemical Engineering Journal[62]. (C) Schematic illustration of the synthesis process of MHCNFs. Copyright 2021, ACS Applied Materials & Interfaces[63]. (D) Schematic presentation of proposed growth mechanism of porous nanoflaked Co3O4. Copyright 2020, Journal of Power Sources[66]. (E) The discharge curve (solid line) of the third cycle of HG-CNFs and the theoretical capacity contribution of each K-GIC transition reaction marked by dotted lines. Copyright 2020, Journal of Power Sources[67].
