Nafion membranes annealed at high temperature and controlled humidity: struture conductivity, and fuel cell performance
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Electrochimica Acta
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The 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. Experimental data reveal that the heat treatment at high
temperature (T 130–140 C) with low relative humidity (RH 0%) results in significant changes of Nafion
such as increased crystallinity and decreased average distance of hydrophilic domains. Such effects were
practically absent when the same heat treatment was carried out at high RH 100%. The effects of
annealing with controlled RH were reflected in the polymer electrolyte fuel cell (PEFC) tests in which the
measured performance was markedly reduced for Nafion samples annealed at low RH. Such a feature was
related to decreased microstructural stability, water sorption and proton conductivity of the annealed
membrane. The observed effects are relevant to evaluate degradation of Nafion during both fuel cell
assembly and harsh PEFC operating conditions. Moreover, the experimental results contribute to advance
the understanding of Nafion’s properties at high temperature for the development of high-performance
ionomer membranes.
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MATOS, BRUNO R.; DRESCH, MAURO A.; SANTIAGO, ELISABETE I.; MORAES, LETICIA P.R.; CARASTAN, DANILO J.; SCHOENMAKER, JEROEN; VELASCO DAVALOS, IVAN A.; RUEDIGER, ANDREAS; TAVARES, ANA C.; FONSECA, FABIO C. Nafion membranes annealed at high temperature and controlled humidity: struture conductivity, and fuel cell performance. Electrochimica Acta, v. 196, p. 110-117, 2016. DOI: 10.1016/j.electacta.2016.02.125. Disponível em: http://repositorio.ipen.br/handle/123456789/25823. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.