dc Proton conductivity at low-frequency in Nafion conductivity spectrum probed by time-resolved SAXS measurements and impedance spectroscopy

ABSTRACT The electric transport properties of Nafion membranes are investigated by impedance spectroscopy (IS) and correlated with small angle X‐ray scattering (SAXS). Detailed IS measurements in a wide range of temperature and frequencies (f) allowed separating contributions from different charge c...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2015-06, Vol.53 (11), p.822-828
Main Authors: Matos, Bruno R., Santiago, Elisabete I., Rey, Jose Fernando Q., Scuracchio, Carlos H., Mantovani, Gerson L., Hirano, Laos A., Fonseca, Fabio C.
Format: Article
Language:English
Subjects:
Direct current
Electric potential
Exchange
Impedance spectroscopy
Ion exchangers
ionomers
Membranes
Relative humidity
relaxation
SAXS
structure-property relations
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Summary:ABSTRACT The electric transport properties of Nafion membranes are investigated by impedance spectroscopy (IS) and correlated with small angle X‐ray scattering (SAXS). Detailed IS measurements in a wide range of temperature and frequencies (f) allowed separating contributions from different charge carriers in Nafion. At controlled relative humidity and temperature, Nafion IS spectrum exhibits at T > 160 °C two distinct frequency‐independent conductivities occurring at high f ∼ 106 Hz and low f 
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.23704