Crystallinity of annealed nafion membranes studied by saxs and afm: effect on pefc performance

dc.creatorMATOS, B.R.
dc.creatorDRESCH, M.
dc.creatorSANTIAGO, E.I.
dc.creatorTAVARES, A.C.
dc.creatorMORAES, LETICIA P.R. DE
dc.creatorCARASTAN, D.J.
dc.creatorSCHOENMAKER, J.
dc.creatorVELASCO-DAVALOS, I.A.
dc.creatorRUEDIGER, A.
dc.creatorFONSECA, F.C.
dc.creatorCONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22.
dc.date2017-03-23T13:10:28Z
dc.date2017-03-23T13:10:28Z
dc.date06-10 de novembro, 2016
dc.date.accessioned2023-09-28T13:33:11Z
dc.date.available2023-09-28T13:33:11Z
dc.identifierhttp://repositorio.ipen.br/handle/123456789/27289
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8997566
dc.descriptionThe relationship between electrical and morphological properties of annealed Nafion samples is investigated by X-ray diffraction (XRD), small angle X-ray scattering (SAXS), atomic force microscopy (AFM), and impedance spectroscopy. The experimental results reveal that membranes submitted to a heat treatment at high temperature (T~130 - 140??C) and low relative humidity (RH), display higher crystallinity and irreversibly shrunk hydrophilic domains. Such an effect was not observed in samples heat treated in the same temperature range but at high RH. The increase in crystallinity and shrinking of the hydrophilic domains reduce the ionomer conductivity. These features were reflected in the polymer electrolyte fuel cell (PEFC) tests in which the measured performance was lower for Nafion samples annealed at low RH and high T than that of samples annealed at high RH. Such results are relevant for understanding the limitations of Nafion membranes at harsh PEFC operating conditions as well as for the development of high-performance ionomer membranes.
dc.format9590
dc.rightsopenAccess
dc.subjectannealing
dc.subjectatomic force microscopy
dc.subjectcrystal structure
dc.subjectheat treatments
dc.subjecthumidity
dc.subjectimpedance
dc.subjectmembranes
dc.subjectproton exchange membrane fuel cells
dc.subjectscattering
dc.subjectx-ray diffraction
dc.titleCrystallinity of annealed nafion membranes studied by saxs and afm: effect on pefc performance
dc.typeResumo de eventos cient??ficos
dc.coverageN


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