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Proton Conducting Electrolyte Membranes based on Tungsten Oxide and Sulfonated Polyether Ether Ketone Hybrid Composites

Published online by Cambridge University Press:  01 February 2011

Barbara Mecheri
Affiliation:
barbara.mecheri@uniroma2.it, University of Rome "Tor Vergata", Chemical Science and Technology, Via della Ricerca Scientifica 11, Rome, Rome, 00133, Italy, +39-06-7295-4496, +39-06-7259-4238
Alessandra D'Epifanio
Affiliation:
alessandra.d.epifanio@uniroma2.it, University of Rome "Tor Vergata", Chemical Science and Technology, Italy
Maria Luisa Di Vona
Affiliation:
divona@uniroma2.it, University of Rome "Tor Vergata", Chemical Science and Technology, Italy
Enrico Traversa
Affiliation:
traversa@uniroma2.it, University of Rome "Tor Vergata", Chemical Science and Technology, Italy
Silvia Licoccia
Affiliation:
licoccia@uniroma2.it, University of Rome "Tor Vergata", Chemical Science and Technology, Italy
Masaru Miyayama
Affiliation:
miyayama@rcast.u-tokyo.ac.jp, The University of Tokyo, Research Center for Advanced Science and Technology (RCAST), Japan
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Abstract

Composite membranes, prepared by mixing sulfonated polyether ether ketone (SPEEK) and WO3·2H2O in dimethylacetamide, were characterized by Thermogravimetry, Electrochemical Impedance Spectroscopy and Water Uptake measurements to evaluate their possible performance as proton exchange membranes (PEM). The body of results indicated the existence of a coordinative interaction between the water molecules of tungsten oxide and the sulfonic acid (-SO3H) groups of SPEEK. Moreover, EIS data demonstrated that the proton conductivity of the composite membranes is higher than both that of pure SPEEK and pure tungsten oxide, suggesting the presence of ion-rich regions where the proton transfer is favored. The SO3H - H2O interaction not only lead to enhancement of the proton conductivity of the membranes but also to improvement of their heat resistance as well as to decrease their water solubility.

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

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References

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