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Diffusivity and free anion concentration of ionic liquid composite polybenzimidazole membranes

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Diffusivity and free anion concentration of ionic liquid composite polybenzimidazole membranes

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dc.contributor.author	Barjola, Arturo
dc.contributor.author	Escorihuela Fuentes, Jorge
dc.contributor.author	García Bernabé, Abel
dc.contributor.author	Sahuquillo, Óscar
dc.contributor.author	Giménez, Enrique
dc.contributor.author	Compañ, Vicente
dc.date.accessioned	2021-12-16T15:55:02Z
dc.date.available	2021-12-16T15:55:02Z
dc.date.issued	2021
dc.identifier.citation	Barjola, Arturo Escorihuela Fuentes, Jorge García Bernabé, Abel Sahuquillo, Óscar Giménez, Enrique Compañ, Vicente 2021 Diffusivity and free anion concentration of ionic liquid composite polybenzimidazole membranes Rsc Advances 11 26379 26390
dc.identifier.uri	https://hdl.handle.net/10550/81074
dc.description.abstract	In this article, PBI composite membranes containing the ionic liquid (IL) 1-butyl-3-methylimidazolium tris(trifluoromethylsulfonyl)imide (BMIM-NTf2) 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 x 10-2 S cm-1 for the PBI-IL-50 membrane at 160 ºC. 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 number density were obtained by means of electrode polarization analysis to obtain more insight into the conduction in these composite membranes. Finally, the Debye length was calculated and related to both transport parameters.
dc.language.iso	eng
dc.relation.ispartof	Rsc Advances, 2021, vol. 11, p. 26379-26390
dc.subject	Materials
dc.subject	Conductivitat elèctrica
dc.title	Diffusivity and free anion concentration of ionic liquid composite polybenzimidazole membranes
dc.type	journal article	es_ES
dc.date.updated	2021-12-16T15:55:03Z
dc.identifier.doi	10.1039/D1RA05364G
dc.identifier.idgrec	149351
dc.rights.accessRights	open access	es_ES