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Título

Proton-conducting methacrylate–silica sol–gel membranes containing tungstophosphoric acid

AutorAparicio, Mario; Mosa Ruiz, Jadra; Etienne, M.; Durán, Alicia
Palabras clavePEMFC
Hybrid conductor
Fecha de publicación2005
EditorElsevier
CitaciónJournal of Power Sources 145 (2005) 231–236
ResumenThe increase of the operation temperature in proton-exchange membrane fuel cell (PEMFC) above 100 ◦C is a great concern for the application of this type of cells in electric vehicles. Hybrid organic–inorganic membranes with nano-sized interfaces can combine the main properties to meet this objective. Methacrylate–silica covalent hybrid membranes have been synthesised by polymerization of 2-hydroxyethyl methacrylate and 3-methacryloxypropyl trimethoxysilane, and hydrolysis–polycondensation of alkoxide radicals. Tungstophosphoric acid hydrate was incorporated to endow the membranes with proton conductivity. The composition and synthesis conditions to promote organic polymerisation and sol–gel condensation avoiding phase separation have been optimised. The structural analysis shows homogeneous membranes without phase separation. The water retention properties provided by SiO2 and tungstophosphoric acid leads to high proton conductivity (maximum values around 3×10−2 S cm−1) at 100–150 ◦C. A 0.5M % of Tungstophosphoric acid (PWA) is enough to build well-connected paths for proton conduction.
Versión del editorhttp://dx.doi.org/doi:10.1016/j.jpowsour.2005.01.071
URIhttp://hdl.handle.net/10261/25112
DOI10.1016/j.jpowsour.2005.01.071
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