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

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A Lashtabeg, John Thomas Sirr Irvine, AJ Feighery

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In the reducing atmosphere of the SOFC anode at operating temperatures of 800 degreesC and. above Nb2TiO7 is reduced to Nb1.33Ti0.67O4. 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 x 10(-6) K-1, however, which may cause problems due to mismatch with other SOFC components, e.g. YSZ. Doping with Fe2O3 successfully increased the thermal expansion to a maximum of 6 x 10(-6) K-1. A conductivity of 140 Scm(-1) at 900 degreesC in dry 5% H-2/Ar, with an activation energy of 0.18 eV, was achieved for the Nb1.344Ti0.642Fe0.014O4, making it suitable for the use as a current collector. Conductivity runs in wet 5%H-2/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 at 850 degreesC, lower than for Ni with 150 - 200 at 850 degreesC, however, this material displayed much better stability at high temperatures than Ni.



Original languageEnglish
Pages (from-to)220-226
Number of pages7
Publication statusPublished - 2003

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