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Diffusivity and Free Anion Concentration of Ionic Liquid Composite Polybenzimidazole Membranes by Barjola, Arturo (author);Escorihuela, Jorge (author);García-Bernabé, Abel (author);Sahuquillo, Óscar (author);Giménez, Enrique (author);Compañ, Vicente (author) is a Materials Science article available to read on EtoBox.

What is Diffusivity and Free Anion Concentration of Ionic Liquid Composite Polybenzimidazole Membranes about?

In this article, PBI composite membranes containing the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIM-NTf~2~) at 1, 5, 10, 20 and 50 wt% (named PBI-IL-__x__) have been prepared by a casting method. The internal morphology of the membranes was analyzed by scanning electron microscopy (SEM), revealing that the incorporation of IL promotes the formation of porous channels. Thermal and mechanical stability was confirmed by thermogravimetric analysis (TGA) and tensile test measurements. The ionic transport through membranes was analysed by means of electrochemical impedance spectroscopy (EIS), showing a dependence on the IL loading, reaching a highest conductivity value of 1.8 × 10^−2^ S cm^−1^ for the PBI-IL-50 membrane at 160 °C. The experimental results showed a Vogel–Fulcher–Tammann (VFT) type relation for the ionic conductivity with temperature and the calculated activation energies suggest that ionic conduction in the films can occur by both hopping and vehicle-type mechanisms. Eyring's absolute rate theory was also used to obtain activation enthalpy and entropy from the temperature dependence of the conductivity. Diffusivity and free ion nu

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Author
Barjola, Arturo (author);Escorihuela, Jorge (author);García-Bernabé, Abel (author);Sahuquillo, Óscar (author);Giménez, Enrique (author);Compañ, Vicente (author)
Publisher
Royal Society of Chemistry (RSC)
Published
2021
Language
EN
Field
Materials Science (Physical Sciences)

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