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| Home > Publications database > Preparation and characterization of La$_{0.8}$Ca$_{0.2}$Fe$_{0.8}$Co$_{0.2}$O$_{3-δ}$ as a new air electrode material for solid oxide cells |
| Home > Publications database > Preparation and characterization of La$_{0.8}$Ca$_{0.2}$Fe$_{0.8}$Co$_{0.2}$O$_{3-δ}$ as a new air electrode material for solid oxide cells |
| Conference Presentation (Other) | FZJ-2022-00682 |
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2021
Abstract: Preparation and characterization of La0.8Ca0.2Fe0.8Co0.2O3-δ as a new air electrode material for solid oxide cellsMario Micu-Budisteanu1, Christian Berger2, Edith Bucher1, Christian Lenser3, Norbert H. Menzler3, Werner Sitte11 Chair of Physical Chemistry, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria2 Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany3 Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Materials Synthesis and Processing (IEK-1), 52425 Jülich, GermanyPerovskites from the series (La,Sr)(Co,Fe)O3-δ are mixed ionic and electronic conductors that are suitable for a broad variety of possible applications, with cathodes for solid oxide fuel cells (SOFCs), anodes for solid oxide electrolyser cells (SOECs), electrochemical gas sensors and catalysts being the most promising fields of application. However, due to long-term stability issues, current research efforts are directed towards development of alternative Sr-free materials. Recently, high electronic- and good ionic conductivities, as well as exceptionally fast oxygen exchange kinetics were demonstrated for La0.8Ca0.2FeO3-δ (LCF82). In the present work, substitution of this material with cobalt is investigated with the aim to further improve sintering activity and electronic conductivity. Therefore, La0.8Ca0.2Fe0.8Co0.2O3-δ (LCFC8282) was synthesized using a sol-gel method. XRD confirmed that the material is single phase. Thermal expansion coefficients (TEC) were determined as a function of oxygen partial pressure (1×10-3 ≤ pO2/bar ≤ 1) and temperature (600 ≤ T/°C ≤ 1000). In comparison of LCF82 with LCFC8282, the TEC of the Co-substituted material is slightly higher with values of 19-23×10- 6 K-1. The electronic conductivity of LCFC8282 is in the range of 128 ≤ S cm-1 ≤ 145 at 600 ≤ T/°C ≤ 800 and pO2=0.1 bar and thus higher than that of LCF82 (~110 S cm-1). First results on the oxygen exchange kinetics of LCF8282 show high activity towards oxygen reduction.
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