Title: Synthesis and performance of A-site deficient lanthanum-doped strontium titanate by nanoparticle based spray pyrolysis
Authors : Burnat, Dariusz Artur
Heel, Andre
Holzer, Lorenz
Kata, Dariusz
Lis, Jerzy
Graule, Thomas J.
Published in : Journal of Power Sources
Volume(Issue) : 201
Pages : 26
Pages to: 36
Publisher / Ed. Institution : Elsevier BV
Issue Date: Mar-2012
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
DOI : 10.1016/j.jpowsour.2011.10.088
ISSN: 0378-7753
URI: https://digitalcollection.zhaw.ch/handle/11475/2197
Appears in Collections:Publikationen School of Engineering

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