Hydration and OH–/Br– Conduction Properties of Fluorene–Thiophene-Based Anion Exchange Thin Films Tethered with Different Cations AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c00811

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After trimethylammonium (TMA) and N-methylpiperidinium (Pip)-functionalized fluorene–thiophene-based anion conductive polymers were synthesized for this work, the effect of cationic groups on hydration and conduction properties of OH–/Br– form fluorene–thiophene-based thin films was investigated. The fluorene–thiophene-based thin film carrying TMA showed superior OH– conductivity to that functionalized with Pip, above 10–2 S cm–1 at 25 °C under 95% relative humidity (RH), because it had higher ion exchange capacity (IEC), lower hydrophobicity, and smaller size of TMA. The in situ temperature-dependent OH– conductivity measurement process for the thin film form was established under different temperatures and 90% RH. The activation energies (Ea) of OH– conduction for thin films carrying TMA and Pip are 33.2 and 35.7 kJ mol–1, respectively. The Ea of OH– conduction was independent of the cation. This is the first systematic study of hydration and OH– conduction properties of anion exchange thin films.