Layered zirconium alkylphosphates: Suitable materials for novel PFSA composite membranes with improved proton conductivity and mechanical stability (Articolo in rivista)

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Label
  • Layered zirconium alkylphosphates: Suitable materials for novel PFSA composite membranes with improved proton conductivity and mechanical stability (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.memsci.2014.03.021 (literal)
Alternative label
  • A. Donnadio, M. Pica, D. Capitani, V. Bianchi, M. Casciola (2014)
    Layered zirconium alkylphosphates: Suitable materials for novel PFSA composite membranes with improved proton conductivity and mechanical stability
    in Journal of membrane science (Print); Elsevier, Amsterdam (Paesi Bassi)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Donnadio, M. Pica, D. Capitani, V. Bianchi, M. Casciola (literal)
Pagina inizio
  • 42 (literal)
Pagina fine
  • 49 (literal)
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  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84897386193&partnerID=q2rCbXpz (literal)
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  • 462 (literal)
Rivista
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  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
  • Google Scholar (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Perugia University, Department of Chemistry, Via Elce di Sotto 8, 06123 Perugia, Italy; Istituto di Metodologie Chimiche CNR (literal)
Titolo
  • Layered zirconium alkylphosphates: Suitable materials for novel PFSA composite membranes with improved proton conductivity and mechanical stability (literal)
Abstract
  • Nanosized ?-layered monohydrogen zirconium phosphate (ZP) has been organically modified by reacting the monohydrogen phosphate groups with of 1,2 epoxydodecane solutions in tetrahydrofuran. The materials thus obtained (ZP(C12)x, with x in the range 0.74-2.1) have been characterized by TEM, thermogravimetric analysis, X-ray powder diffraction and solid state 13C CPMAS NMR. The functionalization leads to a disordered layer packing without substantial alteration of the inorganic framework of the ?-layer of pristine ZP. Samples with x=0.74 and 1.15 have been used as fillers of membranes based on a recast short side chain perfluorinated ionomer with EW=830. Composite membranes with 5-15 wt% filler loadings have been characterized by stress-strain mechanical tests, proton conductivity measurements and water uptake determinations under controlled conditions of temperature and relative humidity (RH). The presence of the filler results in a significant increase in the Young?s modulus of the neat ionomer up to a maximum of 55% and 67% at room temperature and at 80 °C/70% RH, respectively. At 100 °C and in the RH range 50-90%, the conductivity of the composite membranes is higher than that of the neat ionomer, and the proportional increase in conductivity (+72% for RH=50% and +32% for RH=90%) is maximum for 10 wt% filler loading. Surprisingly, under the same conditions of temperature and RH, the hydration of the most conductive composite membrane is lower than the hydration of the neat ionomer. (literal)
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