fig4

Figure 4. A: Schematic illustration of the structure of a Zn-I₂ battery with an I₂/ACF cathode. B: Configurations of I₂, ZnI₂ and Zn(I₃)₂ by DFT calculations and schematic illustration of the reaction in the I₂/CC cathode. C: Schematic diagram of NPC fabrication. D: Schematic diagram of I₂-Nb₂CT_X fabrication. E: Schematic diagram of PBAs/I₂ fabrication and reaction. F: Schematic illustration of PANI-I₂ fabrication. G: Schematic illustration of the structure of the Zn-I₂ battery with double-layered cathodes. Figures reproduced with permission from Pan et al.^[45], Li et al.^[58], Yu et al.^[50], Ma et al.^[27], Li et al.^{[ 52]}, Zeng et al.^[51] and Lin et al.^[59]. NPC: Nitrogen-doped porous carbon ; DFT: density functional theory.