On the chemical interaction of nanoscale lanthanum doped strontium titanates with common scandium and yttrium stabilized electrolyte materials |
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| Authors: | Dariusz Burnat Andre Heel Lorenz Holzer Eugenio Otal Dariusz Kata Thomas Graule |
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| Affiliation: | 1. EMPA – Swiss Federal Laboratories for Material Science and Technology, High Performance Ceramics, Ueberlandstasse 129, CH-8600 Duebendorf, Switzerland;2. AGH – University of Science and Technology in Cracov, Faculty of Material Science and Ceramics, Department of Technology of Ceramics and Refractories, Mickiewicza 30, 30-059 Cracov, Poland;3. EMPA – Swiss Federal Laboratories for Material Science and Technology, Marketing, Knowledge and Technology Transfer, Ueberlandstasse 129, CH-8600 Duebendorf, Switzerland;4. Zurich University of Applied Sciences, Institute of Computational Physics, Wildbachstrasse 21, CH-8400 Winterthur, Switzerland;5. EMPA – Swiss Federal Laboratories for Material Science and Technology, Solid State Chemistry and Catalysis , Ueberlandstasse 129, CH-8600 Duebendorf, Switzerland |
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| Abstract: | Chemical interactions between common electrolyte materials and various La doped strontium titanates (LST), which are redox-stable candidates for SOFCs anodes, were thoroughly investigated. The reactions of nanosized reagents were studied by SEM/EDX microscopy and XRD with subsequent Rietveld refinement. It was found that all A-site deficient LSTs promoted a reaction with Sc and Y stabilized zirconia, whilst stoichiometric LST was chemically stable. Detected structural and microstructural changes were solely assigned to high mobility of Ti. Diffusion of Ti into the zirconia structure promoted formation of tetragonal structures with p42/nmc-type space groups. The results indicate that the reduction of oxygen partial pressure during sintering and application of Sc-containing electrolyte material are successful strategies to hinder or even avoid reactivity. |
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| Keywords: | Reactivity Fluorite Strontium titanate SOFC Anode Chemical stability |
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