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Synthesis and characterisation of proton conducting styrene-co-methacrylate–silica sol–gel membranes containing tungstophosphoric acid

AuthorsAparicio, Mario ; Castro Martín, Yolanda ; Durán, Alicia
Hybrid conductor
Issue Date2005
CitationSolid State Ionics 176 (2005) 333–340
AbstractThe increase of the operation temperature in proton exchange membrane fuel cell (PEMFC) above 100 8C is a great concern for the application of this type of cells in electric vehicles. Hybrid organic–inorganic membranes with nanosized interfaces can combine the main properties to meet this objective. Poly (styrene-co-methacrylate)–silica covalent hybrid membranes have been synthesised by copolymerization of monomers (styrene (STY) and 2-hydroxyethyl methacrylate (HEMA)), with formation of covalent bonds between hydroxyl group from the latter and pre-hydrolyzed tetraethoxysilane. Tungstophosphoric acid hydrate was incorporated to endow the membranes of proton conductivity. The optimal composition and synthesis conditions to promote organic polymerization and sol–gel condensation avoiding phase separation are important issues of this work. The structural analysis shows homogeneous membranes without phase separation. The combination of water uptake and water retention properties provided by SiO2 and tungstophosphoric acid leads to high proton conductivity (maximum values around 1 S/cm) at 120 8C.
Publisher version (URL)http://dx.doi.org/doi:10.1016/j.ssi.2004.07.021
Appears in Collections:(ICV) Artículos
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