Nafion-titanate nanotubes composites prepared by in situ crystallization and casting for direct ethanol fuel cells
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International Journal of Hydrogen Energy
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The physical properties relevant for the application of Nafionetitanate nanotubes composites in electrochemical devices such as water absorption capacity, ion conductivity, and
thermal stability are reported. The nanocomposites were prepared by in situ hydrothermal
conversion of anatase into titanate nanotubes in Nafion matrix and by casting of nanotube
suspensions in Nafion. Composites were characterized by differential scanning calorimetry
(DSC), dynamic vapor sorption (DVS), X-ray diffraction (XRD), transmission electron microscopy (TEM), proton conductivity, and tested in direct ethanol fuel cells (DEFC). Nafion
etitanate nanotubes displayed higher water retention capacity in comparison with Nafion
etitania composites as revealed by DSC and DVS. The ion conductivity at intermediate
temperatures (80e130 C) for Nafionetitanate nanotube composites is higher than Nafion
etitania composites indicating that the hydrophilicity and conduction properties of the
titanate phase contributed to the improvement of the membrane electrical properties. The
Nafionetitanate nanotube composites prepared by in situ solegel exhibited improved
electric and electrochemical performance at high temperatures compared to the composite
prepared by casting. The combined XRD, DSC, and TEM data indicated that at RH ¼ 100%
Nafionetitanate nanotubes are thermally stable up to 130 C, but for higher temperatures
the titanate nanotubes are converted to rutile nanorods.
Como referenciar
MATOS, B.R.; ISIDORO, R.A.; SANTIAGO, E.I.; TAVARES, A.C.; FERLAUTO, A.S.; MUCCILLO, R.; FONSECA, F.C. Nafion-titanate nanotubes composites prepared by in situ crystallization and casting for direct ethanol fuel cells. International Journal of Hydrogen Energy, v. 40, p. 1859-1867, 2015. DOI: 10.1016/j.ijhydene.2014.11.102. Disponível em: http://repositorio.ipen.br/handle/123456789/23410. 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.