dc Proton conductivity at low-frequency in nafion conductivity spectrum probed by time-resolved SAXS measurements and impedance spectroscopy
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Journal of Polymer Science
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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 frequencyindependent conductivities occurring at high f 106 Hz and low
f < 1022 Hz. Such IS measurements were combined with timedependent SAXS measurements under applied dc electric
potential, which provided compelling evidence that the low-f dc
conductivity is related to the motion of protons via ion-hopping
in hydrated Nafion membranes.
Como referenciar
MATOS, BRUNO R.; SANTIAGO, ELISABETE I.; REY, JOSE F.Q.; SCURACCHIO, CARLOS H.; MANTOVANI, GERSON L.; HIRANO, LAOS A.; FONSECA, FABIO C. dc Proton conductivity at low-frequency in nafion conductivity spectrum probed by time-resolved SAXS measurements and impedance spectroscopy. Journal of Polymer Science, v. 53, n. 11, p. 822-828, 2015. Part B. DOI: 10.1002/polb.23704. Disponível em: http://repositorio.ipen.br/handle/123456789/25352. Acesso em: 30 Dec 2025.
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