Reactivity and diffusion between La0.8Sr0.2MnO3 and ZrO2 at interfaces in SOFC cores by TEM analyses on FIB samples |
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| Affiliation: | 1. Ecole des Mines de Paris, Centre des Matériaux, UMR7633-BP 87, 91003 Evry Cedex, France;2. I.C.M.C.B.-CNRS, 87, Av. du Docteur A. Schweitzer, 33608 Pessac Cedex, France;3. RHODIA, Centre de Recherche d''Aubervilliers, 53 rue de la Haie-Coq, 93308 Aubervilliers Cedex, France;4. Ernest Orlando Lawrence Berkeley National Laboratory, National Center For Electron Microscopy, Berkeley, CA 94720, USA;1. Department of Chemical & Process Engineering, University of Strathclyde, Glasgow G1 1XJ, UK;2. School of Engineering, University of Warwick, Coventry CV4 7AL, UK;1. Department of Hydrogen Energy and Plasma Technologies, Tomsk Polytechnic University, 30 Lenina Ave., Tomsk 634050, Russia;2. Laboratory of Applied Electronics, Institute of High Current Electronics, 2/3 Akademichesky Ave., Tomsk 634055, Russia;3. Department of Structural Macrokinetics, Tomsk Scientific Center, 10/4 Akademichesky Ave., Tomsk 634055, Russia;1. Key Laboratory of Thermal-Fluid Science and Engineering of MOE, School of Energy & Power Engineering, Xi''an Jiaotong University, 710049, China;2. Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi''an Jiaotong University, Xi''an 710049, People''s Republic of China |
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| Abstract: | In this paper, we investigate the diffusion and reactivity at the interface between the electrolyte (YSZ) and the cathode (LSM) of planar SOFC single cells by Analytical and High Resolution Transmission Microscopy. Cells were obtained via an aqueous tape-casting process allowing casting the three layers (cathode, electrolyte, anode [Ni-YSZ]) in a single operation. To allow the cell to function at intermediate temperatures (750–850 °C), the final electrolyte thickness after co-sintering at 1350 °C must range between 40 μm and 50 μm. As-sintered cells as well as cells that have been operated at 850 °C have been considered here; it is shown that the electrical performances were one order of magnitude less than expected and that they deteriorated quickly under operating conditions.In order to explain this behavior, we carried out analytical transmission electron microcopy. To obtain precisely located chemical and structural information, we used the “H-Shape” as well as the Lift Out FIB (Focused Ion Beam) techniques to extract 5 × 10 × 0.1 μm TEM samples; additional High Resolution characterization was carried out at interfaces between LSM and YSZ grains on standard ion-milled samples. We showed that the co-sintering temperature (1350 °C) was responsible for some diffusion of manganese through the electrolyte and the cathode, leading then to the rise of a significant electronic conduction and to the drop off of the ionic conductivity, and accounts for the germination and growth of the resistive pyrochlore phase La2Zr2O7. Operating the cell at 850 °C do not aggravate these phenomena, but rather alters the anode microstructure. |
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