Search results for "Nafion membrane"

showing 3 items of 3 documents

Structural and electrochemical investigation on re-cast Nafion membranes for polymer electrolyte fuel cells (PEFCs) application

2006

Abstract 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 wit…

PERFLUORINATED IONOMER MEMBRANESNanostructureMaterials sciencedoctor-blade casting method; pefcs; re-cast nafion membrane; re-cast nation membrane; saxsSmall-angle X-ray scatteringSMALL-ANGLE SCATTERINGFiltration and SeparationSAXSElectrochemistryBiochemistrychemistry.chemical_compoundMembranechemistryChemical engineeringNafionX-RAYIonic conductivityMEDIUM-TEMPERATUREGeneral Materials SciencePhysical and Theoretical ChemistryIonomerDissolutionRe-cast Nafion membrane; PEFCs; Doctor-Blade casting method; SAXSJournal of Membrane Science
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Usefulness of F(dm/dQ) Function for Elucidating the Ions Role in PB Films

2007

The conversion process of "insoluble" prussian blue (PB) films into the "soluble" structure has been followed by the simultaneous measurement of current and mass changes during voltammetric experiments and focusing on the possibilities of the use of the instantaneous mass/electrical charge ratio at each potential. A similar procedure was used for the analysis of the mechanism of reduction of PB films to the Everitt's salt form and to follow the partial dissolution of iron species during the oxidation to the prussian yellow form. The possibility of covering PB films by Nafion membranes, which make difficult the transport of anions through it, allows us to discern the role of anions in the so…

chemistry.chemical_classificationPrussian blueRenewable Energy Sustainability and the EnvironmentAnalytical chemistrySalt (chemistry)Nafion membraneCondensed Matter PhysicsElectric chargeSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsIonchemistry.chemical_compoundchemistrySolubilizationMaterials ChemistryElectrochemistryDissolutionJournal of The Electrochemical Society
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Usefulness of the Instantaneous Mass-charge Ratio for Elucidating the Ions Role in the Stabilization and Dissolution Processes in Prussian Blue Films

2007

The conversion process of 'insoluble' Prussian Blue films into the 'soluble' structure has been followed by the simultaneous measurement of current and mass changes during voltammetric experiments and focusing on the possibilities of the use of the instantaneous mass/electrical charge ratio at each potential. A similar procedure was used for the analysis of the mechanism of reduction of Prussian Blue films to the Everitt's Salt form and to follow the partial dissolution of iron species during the oxidation to the Pussian Yellow form. The possibility of covering Prussian Blue films by Nafion membranes which make difficult the transport of anions through it allows to discern the role of anion…

chemistry.chemical_classificationPrussian bluechemistry.chemical_compoundchemistrySolubilizationInorganic chemistrySalt (chemistry)Nafion membraneDissolutionIonECS Transactions
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