Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/67176
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dc.creatorV. B. Silva
dc.creatorV. S. Silva
dc.creatorL. M. Madeira
dc.creatorS. P. Nunes
dc.creatorA. Mendes
dc.date.accessioned2019-01-31T15:08:04Z-
dc.date.available2019-01-31T15:08:04Z-
dc.date.issued2008
dc.identifier.othersigarra:69577
dc.identifier.urihttps://repositorio-aberto.up.pt/handle/10216/67176-
dc.description.abstractElectrochemical impedance experiments were carried out in order to study the influence of the ZrO2 inorganic incorporation on the proton conductivity of sulfonated poly(ether ether ketone) (sPEEK) membranes. The impedance data was fitted to an extension of Randles' circuit, within the inorganic content and temperature ranges considered. The model fits quite well for ZrO2 loads up to 10 wt.%. Such a model allows for characterizing the diffusion phenomena (Warburg) of the membrane electrode assembly (MEA), membrane and electrodes resistances, capacitive and inductive behavior. Proton conductivity was obtained from the impedance spectra and it was observed that it increases with temperature and decreases with the inorganic content. As a general trend, the Warburg parameter decreases slightly with the temperature, except for the 5 wt. % ZrO2 membrane that suffers a more pronounced influence, The Warburg parameter also decreases with the ZrO2 content.
dc.language.isoeng
dc.relation.ispartofAdvanced Materials Forum IV
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.subjectEngenharia, Engenharia química, Engenharia química
dc.subjectEngineering, Chemical engineering, Chemical engineering
dc.titleAn impedance study on the sPEEK/ZrO2 membranes for direct methanol fuel cell applications
dc.typeArtigo em Livro de Atas de Conferência Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.subject.fosCiências da engenharia e tecnologias::Engenharia química
dc.subject.fosEngineering and technology::Chemical engineering
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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