A Viologen Polymer and a Compact Ferrocene: Comparison of Solution Viscosities and Their Performance in a Redox Flow Battery with a Size Exclusion Membrane

In this work, the synthesis and characterization of a compact, ferrocene tetramer linear viologen polymer is reported. The latter material new, 4,4?-bipyridine containing, organo-soluble polymer. As aimed for solubility in nonpolar solvents, 2-ethylhexyl-moiety to promote organosolubility 4-vinylbenzyl serving as polymerizable group are introduced 4,4?-bipyridine. halide anions monomer cation exchanged bis(trifluoromethansulfon)imide, which further enhances organosolubility. subsequently copolymerized with styrene by free radical polymerization. addition, four-ferrocene-containing compact structure, based on pentaerythritol, synthesized via straightforward thiol-ene reaction. solutions thoroughly characterized hydrodynamically. Subsequently, propylene carbonate-based both materials prepared allow an assessment future energy storage applications. This done testing battery characteristics custom-made flow-cell simple dialysis membrane physical separation active materials. capability verified leaving charged solution open circuit 24 h. Here, more than 99% stored charges can be recovered. Cycling 100 times reveals remarkable stability only 0.2% capacity loss per day setup.