POLYMER-ELECTROLYTE MEMBRANE FOR FUEL CELLS BASED ON CROSS-LINKED POLYIMIDE AND PROTIC IONIC LIQUID

Stanislav М. Makhno, Oksana P. Tarasyuk, Tetiana V. Cherniavska, Oleg V. Dzhuzha, Valeriy І. Parkhomenko, Sergiy P. Rogalsky

Abstract


The aim of this research was to develop polymer-electrolyte membrane on the base of commercial polyimide Matrimid which has high proton conductivity at elevated temperatures above 100 °C. Hydrophobic ionic liquid 1-butylimidazolium bis(trifluoromethylsulfonyl)imide (BIM-TFSI) has been synthesized and used as proton conducting electrolyte. The electrical conductivity of the ionic liquid determined by electrochemical impedance method was found to have a value of 10–3 S/cm in the temperature range from 100 to 180 °С. The composite film based on Matrimid polyimide containing 70 wt % of protic ionic liquid has been prepared by casting from methylene chloride solution. Polyetheramine Jeffamine® D-2000 was used as a cross-linking agent for polyimide. According to mechanical and thermal analysis data, Matrimid/BIM-TFSI composite has tensile strength of 18 MPa and thermal degradation point of 306 °С. Electrophysical properties of polyimide film impregnated with ionic liquid was studied by two-probe technique at the frequencies of 0.1, 1.0 and 10 kHz by using immitance meter in the temperature range from 25 to 180 °С. The electrical conductivity was found to be 2.7∙10–4 S/cm at room temperature and reached the value of 1.5∙10–3 S/cm at 180 °С. Thus, in this work proton conducting membrane based on commercial polyimide has been obtained for the first time by simple method without additional sulfonation stage. Matrimid/BIM-TFSI composite membrane is promising for applications in fuel cells operating at elevated temperature without external humidification.


Keywords


полімер - електролітна мембрана; поліімід; іонна рідина; паливні елементи; протона провідність

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DOI: https://doi.org/10.15421/081708

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