Linear sweep voltammetry was performed using Autolab PGstat204 in potentiostatic mode to characterize dendronized poly(epichlorohydrin-co-ethylene oxide) membranes

The uploaded dataset contains linear sweep voltammetry (LSV) measurements performed on four ion-exchange membranes: CP41, CP71, CP0, and Nafion. The chemical composition and structural characteristics of the commercial and modified membranes used in this work are detailed in Polymers (see Reference 1). LSV measurements were obtained following the method described in Reference 2. Experiments were carried out using an Autolab PGstat204 potentiostat operating in potentiostatic mode. The applied current ranged from 100 mA to 100 μA, with a potential window of 0–5 V, a 0.01 V potential step, and a scan rate of 0.0013 V·s⁻¹. The measurement setup, including electrode arrangement, is shown in Figure S1 of the referenced methodology. Each membrane sample was positioned within a Teflon frame featuring a circular opening corresponding to a 0.5 cm² effective membrane area. The reference electrode (Ag/AgCl) was placed 1.13 cm from the membrane surface. All measurements were performed at ambient temperature, with 200 mL of electrolyte solution in each compartment. A single measurement series was performed for each membrane, sequentially testing HCl, LiCl, NaCl, and KCl electrolytes. For each specific cation, five consecutive LSV scans were recorded at 5, 10, 20, 40, and 60 minutes, resulting in time-dependent current–voltage profiles. These data provide a basis for analyzing ion-transport behavior, electrochemical stability, and time-resolved polarization characteristics of the tested membranes. References Membrane compositions: M. et al., Polymers, 2021. DOI: 10.3390/polym13223915 LSV methodology (as cited in the original work): Source [19] from the referenced article describing the linear sweep voltammetry procedure used to acquire the dataset.