Thermomechanical and conductivity studies of doped niobium titanates as possible current collector material in the SOFC anode

Lashtabeg, Anna, Irvine, John T. S. and Feighery, Alan (2003) Thermomechanical and conductivity studies of doped niobium titanates as possible current collector material in the SOFC anode. Ionics, 9 3-4: 220-226. doi:10.1007/BF02375970


Author Lashtabeg, Anna
Irvine, John T. S.
Feighery, Alan
Title Thermomechanical and conductivity studies of doped niobium titanates as possible current collector material in the SOFC anode
Journal name Ionics   Check publisher's open access policy
ISSN 0947-7047
1862-0760
Publication date 2003-05-01
Sub-type Article (original research)
DOI 10.1007/BF02375970
Open Access Status Not yet assessed
Volume 9
Issue 3-4
Start page 220
End page 226
Total pages 7
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
In the reducing atmosphere of the SOFC anode at operating temperatures of 800 °C and above Nb2TiO7 is reduced to Nb 1 33Ti0.67O4. This material displays very high electronic conductivity of >100 Scm-1, suitable for use in such applications as a current collector. It has a low thermal expansion coefficient of 3 × 10-6 K-1, however, which may cause problems due to mismatch with other SOFC components, e.g. YSZ. Doping with Fe 2O3 successfully increased the thermal expansion to a maximum of 6 × 10-6 K-1. A conductivity of 140 Scm-1 at 900 °C in dry 5% H2/Ar. with an activation energy of 0.18 eV. was achieved for the Nb1 344Ti 0.642Fe0 014O4, making it suitable for the use as a current collector. Conductivity runs in wet 5%H2/Ar showed lower conductivities of 15-18 Scm-1 and lower activation energies of 0.08 - 0.09 eV. Single cell tests of Nb1 33Ti0.67O4 showed power outputs of 5.5 - 7.2 mW-cnr at 850 °C, lower than for Ni with 150 - 200 inW-cm-2 at 850 °C. however, this material displayed much better stability at high temperatures than Ni.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Microscopy and Microanalysis Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 10 Feb 2011, 19:29:26 EST by Dr Anna Lashtabeg on behalf of Centre for Microscopy and Microanalysis