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New Polybenzimidazole-Based Membranes for Fuel Cells

Published online by Cambridge University Press:  26 February 2011

Eliana Quartarone ,
Arianna Carollo ,
Piercarlo Mustarelli ,
Aldo Magistris ,
Corrado Tomasi ,
Luigi Garlaschelli  and
Pier Paolo Righetti
Eliana Quartarone
Affiliation:
elena.quartarone@unipv.it, University of Pavia, Dept. of Physical Chemistry, Via Taramelli 16, Pavia, 27100, Italy
Arianna Carollo
Affiliation:
arianna.carollo@unipv.it, University of Pavia, Department of Physical Chemistry, Via Taramelli 16, Pavia, 27100, Italy
Piercarlo Mustarelli
Affiliation:
mustarelli@matsci.unipv.it, University of Pavia, Department of Physical Chemistry, Via Taramelli 16, Pavia, 27100, Italy
Aldo Magistris
Affiliation:
aldo.magistris@unipv.it, University of Pavia, Department of Physical Chemistry, Via Taramelli 16, Pavia, 27100, Italy
Corrado Tomasi
Affiliation:
corrado.tomasi@unipv.it, IENI-CNR, Pavia, 27100, Italy
Luigi Garlaschelli
Affiliation:
garlasch@unipv.it, University of Pavia, Department of Organic Chemistry, Via Taramelli 12, Pavia, 27100, Italy
Pier Paolo Righetti
Affiliation:
pierpaolo.righetti@unipv.it, University of Pavia, Department of Organic Chemistry, Via Taramelli 12, Pavia, 27100, Italy
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Abstract

One of current trends of the PEM research is the development of new membranes working at high temperature and low humidity.

Acid-doped polybenzimidazoles are particularly appealing because of high proton conductivity without humidification and promising fuel cells performances. PBI contains basic functional groups that can easily interact with strong acids, such as H3PO4, H2SO4, allowing proton migration along the anionic chains via a Grotthuss mechanism.

In this work phosphoric acid-doped membranes, synthesised from benzimidazole-based monomers with increased basicity and molecular weight, are described and discussed. The influence of the monomer structure on the transport properties and on the physico-chemical interactions between acid and polymer has been investigated by means of impedance spectroscopy and 31P solid-state NMR. Test of methanol crossover and diffusion have been performed to check the membrane suitability for DMFCs.

Keywords

ionic conductorenergy-storagepolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA08-03
Copyright
Copyright © Materials Research Society 2007

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References

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