MATOS, BRUNO R.SANTIAGO, ELISABETE I.REY, JOSE F.Q.SCURACCHIO, CARLOS H.MANTOVANI, GERSON L.HIRANO, LAOS A.FONSECA, FABIO C.2015-12-212015-12-212015MATOS, 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. <b>Journal of Polymer Science</b>, v. 53, n. 11, p. 822-828, 2015. Part B. DOI: <a href="https://dx.doi.org/10.1002/polb.23704">10.1002/polb.23704</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/25352.0887-6266http://repositorio.ipen.br/handle/123456789/25352The 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.822-828closedAccession exchangemembranesimpedancespectroscopyscatteringrelaxationproton conductivitysmall angle scatteringArtigo de periódico1153Part B10.1002/polb.23704https://orcid.org/0000-0002-5972-5933https://orcid.org/0000-0003-0708-202184.12