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Crystals 2018, 8(3), 134;

Application of La-Doped SrTiO3 in Advanced Metal-Supported Solid Oxide Fuel Cells

Institute of Condensed Matter Chemistry and Energy Technologies (ICMATE), National Council of Research (CNR), c/o DICCA-UNIGE, Via all’Opera Pia 15, 16145 Genova, Italy
Department of Chemical, Civil and Environmental Engineering, DICCA-UNIGE, Via all’Opera Pia 15, 16145 Genova, Italy
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), German Aerospace Center, Institute of Engineering Thermodynamics—Electrochemical Energy Technology, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Author to whom correspondence should be addressed.
Received: 31 January 2018 / Revised: 9 March 2018 / Accepted: 10 March 2018 / Published: 13 March 2018
(This article belongs to the Special Issue Ceramic Conductors)
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Composite materials frequently allow the drawbacks of single components to be overcome thanks to a synergistic combination of material- and structure-specific features, leading to enhanced and also new properties. This is the case of a metallic-ceramic composite, a nickel-chromium-aluminum (NiCrAl) foam impregnated with La-doped Strontium Titanate (LST). This particular cermet has very interesting properties that can be used in different fields of application, namely: mechanical robustness provided by the metal foam; and chemical stability in harsh conditions of temperature and atmosphere by promotion of a thin protective layer of alumina (Al2O3); high electronic conductivity given by a percolating ceramic conducting phase, i.e., La-doped Strontium Titanate. In this paper, its application as a current collector in a metal-supported Solid Oxide Fuel Cells (SOFC) was studied. Firstly, the electronic properties of different compositions, stoichiometric and under stoichiometric, of LST were analyzed to choose the best one in terms of conductivity and phase purity. Then, LST chemical stability was studied in the presence of Al2O3 at different temperatures, gas compositions and aging times. Finally, stability and conductivity of LST-impregnated NiCrAl foam composite materials were measured, and LST was found to be fully compatible with the NiCrAl foam, as no reactions were detected in oxidizing and reducing atmosphere after up to 300 h operation at 750 °C and 900 °C between the Al2O3 layer and LST. Results showed that the composite is suitable as a current collector in innovative designs of metal-supported SOFC, like the Evolve cell, in which the metallic part is supposed not only to provide the structural stability to the cell, but also to play the role of current collector due to the impregnation of ceramic material. View Full-Text
Keywords: La-doped SrTiO3; Solid Oxide Fuel Cells; electronic conductivity; impregnation; redox cycle; current collector; metal foam La-doped SrTiO3; Solid Oxide Fuel Cells; electronic conductivity; impregnation; redox cycle; current collector; metal foam

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Presto, S.; Barbucci, A.; Carpanese, M.P.; Han, F.; Costa, R.; Viviani, M. Application of La-Doped SrTiO3 in Advanced Metal-Supported Solid Oxide Fuel Cells. Crystals 2018, 8, 134.

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