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Low temperature proton conduction in bulk nanometric TiO2 prepared by high-pressure field assisted sintering

Published online by Cambridge University Press:  24 May 2012

Filippo Maglia ,
Ilenia G. Tredici ,
Giorgio Spinolo  and
Umberto Anselmi-Tamburini
Filippo Maglia*
Affiliation:
Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli 12, I-27100 Pavia, Italy
Ilenia G. Tredici
Affiliation:
Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli 12, I-27100 Pavia, Italy
Giorgio Spinolo
Affiliation:
Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli 12, I-27100 Pavia, Italy
Umberto Anselmi-Tamburini
Affiliation:
Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli 12, I-27100 Pavia, Italy
*
a)Address all correspondence to this author. e-mail: filippo.maglia@unipv.it
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Abstract

We investigated the conductivity of high-density bulk-anatase samples with a grain size between 24 and 56 nm prepared by high pressure field-assisted sintering. When exposed to humid atmosphere, the insurgence of proton conductivity was observed for temperatures below 350 °C. Below this temperature, the samples showed a conductivity several orders of magnitude higher than that measured under dry oxygen atmosphere. The protonic conductivity strongly increased as grain size decreased, while a negligible dependence from porosity was observed when the latter ranged between 8 and 25 vol%. If compared with zirconia- and ceria-based nanomaterials with similar grain size, bulk nanometric anatase showed the highest low temperature protonic conductivity as well as the highest crossover temperature between dry and humid conduction behavior.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 15: Focus Issue: Advanced Materials for Fuel Cells , 14 August 2012 , pp. 1975 - 1981
Copyright
Copyright © Materials Research Society 2012

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