Synthesis and electrical characterisation of doped perovskite titanates as potential anode materials for solid oxide fuel cells

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Abstract

This work reports the synthesis and electrical characterisation over a range of oxygen partial pressures (10–20–1 atm) of the A-site deficient perovskites Sr1–3x/2LaxTiO3–δ, with a view to establishing their potential as anode materials for solid oxide fuel cells. Single phase samples were observed for synthesis in air for 0≤x≤0.6, and the materials remained phase pure for both high and low oxygen partial pressures at the measurement temperature of 930 °C. Good electrical conductivity, which increased with increasing La content, was observed on reduction in low oxygen partial pressures, with values as high as 7 S cm–1 [ P(O2)= 10–20 atm], similar to values observed for the related system, Sr1–x/2Ti1–xNbxO3–δ, examined previously. The conductivity of the fully reduced samples showed metallic character from 100 to 930 °C. As the oxygen partial pressure was raised, the conductivity dropped, showing an approximate [P(O2)]–1/6 dependence for porous samples. New samples, Sr1–y/2–3x/2LaxTi1–yNbyO3–δ, with both La and Nb substitutions, were also studied, and these phases showed similar electrical behaviour. Further results for the Sr1–x/2Ti1–xNbxO3–δsystem are presented and compared with the La doped systems.

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