Herein, hyperbranched 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO)-based polymers intended for application as low-viscosity catholytes for RFBs are presented and the inuence of the structure and the fl molar mass distribution on the hydrodynamic properties is investigated. In this work, the ionic conductivity of SPEEK membranes is increased almost fourfold by conducting a well-controlled irreversible swelling. . For an iron-chromium redox flow battery (ICRFB), sulfonated poly (ether ether ketone) (SPEEK) membranes with five various degrees of sulfonation (DSs) are studied. However, intermolecular interactions of polymer molecules, i.
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