Abstract
Barium stannate doped with 2 at.% of lanthanum was synthesized and investigated as a potential anode material for low temperature solid oxide fuel cells (LT-SOFCs). Ba0.98 La0.02SnO3-δ ceramic was calcined at 1200-1300°C in air to obtain the cubic perovskite phase and then sintered at 1550°C for 12h. The sintered sample has shown approx. 7% shrinkage and 70% density. For the 30% porous sample, electrical conductivity values of 8.7 S/cm and 9.3 S/cm, respectively was achieved, at 600°C and 400°C, respectively in 10% H2/3%H2O/N2.The preliminary results has shown a decent redox stability, approx. 7 % loss in conductivity at 600°C when cycled 3 times between air and reducing conditions over a period of 60 h. Post-test XRD analysis on Ba0.98 La0.02SnO3-δ samples show structural stability by retaining the cubic perovskite phase. The material was also stable in dry and humidified H2. Interestingly, the material has shown semi-conductor like behavior in the presence of methane. The conductivity values of the materials in 97%CH4/3%H2O gas were 6.4 and 2.2 S/cm at 600 and 500°C, respectively. This material has promising performance for integration into an LT-SOFC anode, but processing challenges remain.
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