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An Impedance Study on the sPEEK/ZrO2 Membranes for Direct Methanol Fuel Cell Ap...
V. B. Silva; V. S. Silva; L. M. Madeira; S. P. Nunes; A. MendesElectrochemical 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...
Non-Fluorinated Membranes Thickness Effect on the DMFC Performance
Vasco Freitas Silva; Valter B. Silva; R. Reissner; S. Vetter; A. Mendes; L. M. Madeira; S. P. NunesIn order to study the influence of the proton exchange membrane thickness on the direct methanol fuel cell (DMFC) performance, sulfortated poly (ether ether ketone) (sPEEK) membranes with a sulfonation degree (SD) of 42% and thicknesses of 25, 40, and 55 pm were prepared, characterized, and tested in a DMFC. These polymeric membranes were tested in a DMFC at several temperatures by evaluating the current-voltag...
Preparación, caracterización y comportamiento catalítico de catalizadores basad...
J. H. Ramírez; C. A. Costa; L. M. Madeira; G. Mata; M. A. VicenteEn el presente trabajo se presentan resultados experimentales que evidencian la degradación y mineralización de disoluciones de Orange II (0,1 mM) por medio de un catalizador basado en saponita impregnada con sales de hierro, en presencia de peróxido de hidrógeno, en un reactor cerrado perfectamente agitado. Se prepararon doce muestras, con tres cargas distintas de hierro (7,5; 13,0 y 17,0 % en peso de Fe en lo...
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