|Title:||Synthesis and performance of A-site deficient lanthanum-doped strontium titanate by nanoparticle based spray pyrolysis|
|Authors :||Burnat, Dariusz Artur|
Graule, Thomas J.
|Published in :||Journal of Power Sources|
|Publisher / Ed. Institution :||Elsevier BV|
|Language :||Englisch / English|
|Subject (DDC) :||620.11: Werkstoffe|
|Abstract:||In this study A-site deficient lanthanum doped strontium titanate, which is considered as a promising, redox-stable candidate for full ceramic anodes in Solid Oxide Fuel Cells (SOFCs), was produced by nanoparticle-based spray pyrolysis. In this process cost-effective nitrate salts and titania nanoparticles are used as precursors. LST with a nominal composition of La0.2Sr0.7TiO3 showed limited stability at temperatures higher than 1290 °C. It was observed that minor contents of secondary phases, which form at elevated temperatures, invoke a drastic loss of the electrical performance. Thermal stability is significantly increased by a slight enrichment of strontium. The phase pure A-site deficient LST shows remarkably higher electrical performance than similar stoichiometric counterparts. Reductive sintering results in a conductivity as high as 600 S cm−1 at 600 °C. Furthermore the A-site deficient LST shows a high redox-stability and fast redox-kinetics. With these properties LST is a suitable material for the fabrication of a new generation of Ni-free ceramic SOFC anodes. Secondary phases have a significant influence on the electrical conductivity and redox behaviour.|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Computational Physics (ICP)|
Institute of Materials and Process Engineering (IMPE)
|Publication type:||Beitrag in wissenschaftlicher Zeitschrift / Article in scientific Journal|
|Appears in Collections:||Publikationen School of Engineering|
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