Structural and dielectric properties of cobaltacarborane composite polybenzimidazole membranes as solid polymer electrolytes at high temperature
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Other documents of the author: Fuentes, Isabel; Andrio, Andreu; García Bernabé, Abel; Escorihuela, Jorge; Viñas, Clara; Teixidor, Francesc; Compañ, Vicente
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
Structural and dielectric properties of cobaltacarborane composite polybenzimidazole membranes as solid polymer electrolytes at high temperatureAuthor (s)
Date
2018Publisher
Royal Society of ChemistryISSN
1463-9076; 1463-9084Bibliographic citation
FUENTES, Isabel, et al. Structural and dielectric properties of cobaltacarborane composite polybenzimidazole membranes as solid polymer electrolytes at high temperature. Physical Chemistry Chemical Physics, 2018, vol. 20, no 15, p. 10173-10184.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/submittedVersionAbstract
The conductivity of a series of composite membranes, based on polybenzimidazole (PBI) containing the
metallacarborane salt M[Co(C2B9H11)2], M[COSANE] and tetraphenylborate, M[B(C6H5)4], M[TPB] both
anions having the ... [+]
The conductivity of a series of composite membranes, based on polybenzimidazole (PBI) containing the
metallacarborane salt M[Co(C2B9H11)2], M[COSANE] and tetraphenylborate, M[B(C6H5)4], M[TPB] both
anions having the same number of atoms and the same negative charge, has been investigated. Different
cations (M = H+, Li+ and Na+) have been studied and the composite membranes have been characterized
by water uptake, swelling ratios, ATR FT-IR, thermogravimetric analysis and electrochemical impedance
spectroscopy to explore the dielectric response and ion dynamics in composite membranes. Our results
show that conductivity increases with increasing temperature and it is higher for H+ than for Li+ and Na+
for all temperatures under study. The mobility of Li+ is greater in [COSANE] than in [TPB] composite
PBI@membranes while for Na+ it is the opposite. The temperature dependence of the conductivity of the
composite was followed by a typical Arrhenius behaviour with two different regions: (1) between 20 and
100 1C, and (2) between 100 and 150 1C. Using the analysis of electrode polarization (EP) based on the
Thrukhan theory we have calculated the ionic diffusion coefficients and the density of carriers. From the
double logarithmic plot of the imaginary part of the conductivity (s00) versus frequency in the entire
range of temperatures studied we have determined for each sample at each temperature, the frequency
values of the onset (fON) and full development of electrode polarization (fMAX), respectively, which permit
us to calculate static permittivity [-]
Is part of
Phys. Chem. Chem. Phys., 2018, 20Investigation project
ENE/2015-69203-R project and CTQ2016-75150-R project ; 2014/SGR/149Rights
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