Polymers: Containing Redox‐ActiveN‐Heterocyclic Moieties

A range of N-containing scaffolds, acyclic [e.g. (C 6 H 5 ) 3 N] as well as cyclic ones (e.g. carbazole, dihydrophenazine, and phenothiazine) have been discussed, as active materials, in the context of energy storage. Besides the side-chain or main-chain redox polymers, 2D polymer architectures have gained significant attention. These covalent frameworks combine redox activity and conductivity (due to their conjugated structure) with good rate performances guaranteed by their mostly porous morphology. Accordingly, applications in various types of solid-state batteries (beyond the lithium-ion technology) and supercapacitors have recently emerged.