fig21
Figure 21. (A) K-ion characterization and modeling[220]. Reproduced from Ref.[220] with open access from Springer Nature; (B) Schematic demonstration of the Mg metal battery modified by a COF layer and the role of CuPc-PD COF in regulating the uniform and directional Mg2+ transport[221]. Reproduced from Ref.[221] with permission from Wiley; (C) Schematic diagram of calcium ion batteries with different anodes[222]. Reproduced from Ref.[222] with open access from the Royal Society of Chemistry. COF: Covalent organic frameworks; DME: 1,2-dimethoxyethane; MOF: metal-organic frameworks; MOC: metal-organic cages.
