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SPEEK-based Composite Membranes for Direct Methanol Fuel Cells

Published online by Cambridge University Press:  01 February 2011

Alessandra D'Epifanio ,
Barbara Mecheri ,
Christoph F Weise ,
Steve Greenbaum ,
E Traversa  and
Silvia Licoccia
Alessandra D'Epifanio
Affiliation:
alessandra.d.epifanio@uniroma2.it, University of Rome "Tor Vergata", Rome, Italy
Barbara Mecheri
Affiliation:
barbara.mecheri@uniroma2.it, University of Rome "Tor Vergata", Rome, Italy
Christoph F Weise
Affiliation:
cfweise@yahoo.com, Hunter College of the City University of New York, New York, New York, United States
Steve Greenbaum
Affiliation:
steve.greenbaum@hunter.cuny.edu, Hunter College of the City University of New York, New York, New York, United States
E Traversa
Affiliation:
NAST Center & Department of Chemical Science and Technology, University of Rome “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Roma, Italy
Silvia Licoccia
Affiliation:
licoccia@uniroma2.it, University of Rome "Tor Vergata", Rome, Italy
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Abstract

Sulfonated polyether ether ketone (SPEEK)-based composite membranes doped with 23 and 50 wt% of hydrated tin oxide (SnO2·nH2O) were prepared and characterized for Direct Methanol Fuel Cell (DMFC) applications . The composite membranes were characterized in terms of ion exchange capacity (IEC), tensile tests, water uptake measurements, electrochemical impedance spectroscopy (EIS), and Pulsed-field-gradient spin-echo nuclear magnetic resonance (PFGSE NMR) spectroscopy. The body of results indicated the involvement of hydrated tin oxide in the proton conduction mechanism, the inorganic phase providing additional paths between the water clusters for proton transport. NMR measurements evidenced that SnO2·nH2O particles not only facilitate the proton transport but also hinder water diffusion. Therefore, due to the selectivity of SnO2·nH2O for proton diffusion, the filler effect was found to be also beneficial for the reduction of methanol crossover through the SPEEK membrane and for improving the performance of the SPEEK membrane when used as electrolyte in a DMFC test station.

Keywords

compositepolymerenergy generation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1126: Symposium S – Solid-State Ionics–2008 , 2008 , 1126-S12-02
Copyright
Copyright © Materials Research Society 2009

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References

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