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Proton conductivity in silica gels

Proton conductivity in silica gels Commercial silica gel drying pearls were used in impedance measurements between ambient temperature and 300 °C in dry and humid atmospheres. A pronounced difference was seen supporting previous conclusions that proton conduction was operative in these amorphous samples. The same conclusion was reached on the basis of a fuel cell experiment at ambient temperature. A Nernst voltage close to the theoretical one was observed. Mechanical tests were carried out with silica gel plates made from the above material. Such plates displayed in the bending mode a time-dependent anelastic relaxation, i.e., a Gorsky effect, which arose from the long-range diffusion of protonic defects from the compressed to the dilated part of the plate. The chemical diffusivity and the density of the protonic defects could be determined. The same Gorsky effect may be expected in crystalline proton conductors, and also in Li-containing ceramics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Proton conductivity in silica gels

Schober, T.
Ionics , Volume 12 (2) – Jun 22, 2006
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References (6)

Publisher
Springer Journals
Copyright
Copyright © 2006 by Springer-Verlag
Subject
Chemistry; Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-006-0028-0
Publisher site
See Article on Publisher Site

Abstract

Commercial silica gel drying pearls were used in impedance measurements between ambient temperature and 300 °C in dry and humid atmospheres. A pronounced difference was seen supporting previous conclusions that proton conduction was operative in these amorphous samples. The same conclusion was reached on the basis of a fuel cell experiment at ambient temperature. A Nernst voltage close to the theoretical one was observed. Mechanical tests were carried out with silica gel plates made from the above material. Such plates displayed in the bending mode a time-dependent anelastic relaxation, i.e., a Gorsky effect, which arose from the long-range diffusion of protonic defects from the compressed to the dilated part of the plate. The chemical diffusivity and the density of the protonic defects could be determined. The same Gorsky effect may be expected in crystalline proton conductors, and also in Li-containing ceramics.

Journal

Ionics – Springer Journals

Published: Jun 22, 2006

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