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Proton conductivity of functionalized zirconia colloids

Published online by Cambridge University Press:  11 February 2011

D. Carrière ,
M. Moreau ,
K. Lahlil ,
P. Barboux  and
J.-P. Boilot
D. Carrière
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643C, 1 route de Saclay, Ecole Polytechnique, 91128 Palaiseau Cedex
M. Moreau
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643C, 1 route de Saclay, Ecole Polytechnique, 91128 Palaiseau Cedex
K. Lahlil
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643C, 1 route de Saclay, Ecole Polytechnique, 91128 Palaiseau Cedex
P. Barboux
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643C, 1 route de Saclay, Ecole Polytechnique, 91128 Palaiseau Cedex
J.-P. Boilot
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643C, 1 route de Saclay, Ecole Polytechnique, 91128 Palaiseau Cedex
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Abstract

Colloidal 60 nm ZrO2 particles have been treated with aqueous solutions of phosphoric acid and sulphophenyl-phosphonic acid (SPPA). This leads to the covalent bonding of P-OH and C6H4-SO3H acid groups onto the surface of the particles. The resulting acidity yields a significant proton conductivity at the surface of the particles.

The proton conductivity of the ZrO2-H3PO4 system is quite stable against a change of relative humidity and temperature. However, it remains limited by the low acidity of the POH group. On the contrary, the proton conductivity of the ZrO2-SPPA system is almost two orders of magnitude higher at high relative humidities due to the high acidity of the C6H4-SO3H group (1.10-3 S.cm-1 in the same conditions). But, it is much more sensitive to changes in relative humidity.

A mixed grafting of both H3PO4 and SPPA onto the zirconia particles allows to obtain a conductivity as high as in the SPPA case whereas it remains stable with humidity and temperature as for the phosphoric acid. This probably indicates that the conductivity arises from ionization of sulphonic acid but that the weaker phosphoric acid groups contribute to the conduction mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE1.9
Copyright
Copyright © Materials Research Society 2003

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References

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