Starting from a 5 wt% ion power Nafion® solution and dissolving the dry residue in a suitable solvent (10 wt% solution in dimethylacetammide), re-cast Nafion films were developed for polymer electrolyte fuel cells (PEFCs) application. The used Doctor-Blade casting technique allowed to prepare scaled-up membranes comparable to the commercial Nafion ones with good mechanical resistance, thickness homogeneity and an excellent reproducibility. The differences between the re-cast membrane nanostructure and that of the commercial Nafion were investigated by synchrotron small-angle X-ray scattering. The obtained re-cast membrane shows at ambient conditions a semi-crystalline structure with a typical correlation length of about 86 °A and an intercluster Bragg distance of 37 A° , quite different from the values of commercial film. Observation on the swelling of the films revealed that the semi-crystalline structure, once soaked in water, swells less than the ionomeric part, leading to an unusual small-angle X-ray scattering (SAXS) profile in which the matrix and the ionomer peak are significantly overlapped. The ionic conductivity measured at T=80 ◦C shows slightly higher values for the re-cast Nafion membrane. A power density of about 0.490Wcm−2 at 0.6V and at T=80 ◦C in humidified hydrogen/air was obtained for the developed membrane.
|Data di pubblicazione:||2006|
|Titolo:||Structural and electrochemical investigation on re-cast Nafion membranes for polymer electrolyte fuel cells (PEFCs) application|
|Autori:||SACCA' A; CARBONE A; PEDICINI R; PORTALE G; DILARIO L; LONGO A; MARTORANA A; PASSALACQUA E|
|Tipologia:||Articolo su rivista|
|Citazione:||SACCA' A, CARBONE A, PEDICINI R, PORTALE G, DILARIO L, LONGO A, et al. (2006). Structural and electrochemical investigation on re-cast Nafion membranes for polymer electrolyte fuel cells (PEFCs) application. JOURNAL OF MEMBRANE SCIENCE, 278, 105-113.|
|Digital Object Identifier (DOI):||10.1016/j.memsci.2005.10.047|
|Appare nelle tipologie:||01 - Articolo su rivista|