Structure and transport properties of annealed nafion membranes
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2016
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BRAZILIAN MRS MEETING, 15th
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Resumo
The relationship between electrical properties and the structural features of
annealed Nafion samples was investigated by X-ray diffraction (XRD), small angle
X-ray scattering (SAXS), scanning electron microscopy (SEM), and impedance
spectroscopy. Understanding of the observed effects on the proton conductivity
due to annealing at controlled humidity at high temperature is crucial for
improving the polymer electrolyte fuel cell (PEFC) at high operating temperatures
(T > 100 °C) [1]. The experimental results reveal that membranes submitted to a
heat treatment in the 100 – 200 °C temperature interval at low relative humidity
(RH), display higher crystallinity and irreversibly shrinking of the ionic domains.
However, the electrical properties of the polymer matrix were mostly affected by
the irreversible destabilization of the ionic phase. 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 high T
compared to pristine membranes. Such results are relevant for the preparation of
membrane electrode assemblies as well as for the development of highperformance
ionomer membranes.
Como referenciar
MATOS, BRUNO R.; SILVA, JAQUELINE de S. da; FONSECA, FABIO C. Structure and transport properties of annealed nafion membranes. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... p. 1572-1572. Disponível em: http://repositorio.ipen.br/handle/123456789/27429. 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.