Chemical and electrochemical characterization of Nafion containing silver nanoparticles in a stripe-like distribution

The particular chemical structure of Nafion with nanostructured and segregated hydrophilic and hydrophobic domains enables its use as a model structure for the manufacture of polymer-metal nanocomposites. Among such nanocomposites, samples of Nafion-117 containing Ag-NPs of ca. 10 nm prepared by Int...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (12), p.9923-9931
Main Authors: Domènech, B, Romero, V, Vázquez, M. I, Avila, M, Benavente, J, Muñoz, M, Macanás, J
Format: Article
Language:English
Subjects:
Devices
Electric potential
Enginyeria química
Ionomers
Membranes
Nanocomposites
Nanocomposites (Materials)
Nanocompostos (Materials)
Nanostructure
Polymers
Polímers
Reduction
Silver
X-ray photoelectron spectroscopy
Àrees temàtiques de la UPC
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Summary:The particular chemical structure of Nafion with nanostructured and segregated hydrophilic and hydrophobic domains enables its use as a model structure for the manufacture of polymer-metal nanocomposites. Among such nanocomposites, samples of Nafion-117 containing Ag-NPs of ca. 10 nm prepared by Intermatrix Synthesis exhibited a particular distribution in the form of stripes, a regular pattern that could reveal the real morphology of the polymer. To evaluate the potential application of this engineered material ( e.g. in electrochemical devices), these new nanocomposite membranes were characterized by different techniques: microscopic, surface chemical analysis, mechanical and electrical/electrochemical. X-ray (XRD and XPS) analyses combined with synchrotron experiments (XANES) were used to determine the chemical speciation of Ag in the membrane. Membrane potential and impedance spectroscopy measurements showed that such Ag-NPs did not hinder the diffusive transport of protons in the membrane bulk, moreover, they slightly reduced the electrical resistance in fully hydrated state samples. The mechanical evaluation of the nanocomposite evidenced a reduction of the elastic character when compared with the unmodified Nafion-117 sample. Study of the effect of Ag-NPs stripes in Nafion: evaluation of chemical, electrochemical and mechanical properties.
ISSN:2046-2069
2046-2069
DOI:10.1039/c5ra22838g