Niobium based tetragonal tungsten bronzes as potential anodes for solid oxide fuel cells: synthesis and electrical characterisation |
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Authors: | P. R. Slater and J. T. S. Irvine |
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Affiliation: | School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9AJ, UK |
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Abstract: | In this paper we report studies on a range of niobate based tungsten bronzes, with a view to analysing their potential as anode materials in SOFCs. Six systems were studied, (Sr1−xBax)0.6Ti0.2Nb0.8O3, Sr0.6−xLaxTi0.2+xNb0.8−xO3, (Sr0.4−xBax)Na0.2NbO3, (Ba1−xCax)0.6Ti0.2Nb0.8O3, Ba0.5−xAxNbO3 (A=Ca, Sr), and Ba0.3NbO2.8, and the electrical conductivities were examined over a range of oxygen partial pressures (10−20–1 bar). All the systems showed good conductivity in low oxygen partial pressures, with values as high as 8 S cm−1 at 930°C (P(O2)=10−20 bar). As the oxygen partial pressure was raised the conductivity dropped showing in most cases an approximate [P(O2)]−1/4 dependence and good re-oxidation kinetics. Of all the samples studied the (Sr1−xBax)0.6Ti0.2Nb0.8O3 and (Ba1−xCax)0.6Ti0.2Nb0.8O3 systems appear most promising for potential use as anode materials in SOFCs. |
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Keywords: | Anodes Electrical characterisation Niobates Solid oxide fuel cells Tungsten bronzes |
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