Stabilisation of composite LSFCO–CGO based anodes for methane oxidation in solid oxide fuel cells |
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| Affiliation: | 1. Pirelli Labs S.p.A., Viale Sarca 222, I-20126 Milan, Italy;2. CNR-ITAE, Via Salita Santa Lucia Sopra Contesse 5, I-98125 Messina, Italy;1. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, Building 779, DK-4000 Roskilde, Denmark;2. EMPA, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, CH-8600 Dübendorf, Switzerland;1. German Aerospace Centre (DLR), Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany;2. Institute of Thermodynamics and Thermal Engineering (ITW), Universität Stuttgart, Pfaffenwaldring 6, 70550 Stuttgart, Germany;3. Université Grenoble Alpes, Laboratoire d''Electrochimie et de Physico-Chimie des Matériaux et des Interfaces, F-38000 Grenoble, France;4. CNRS, Laboratoire d’Electrochimie et de Physico-Chimie des Matériaux et des Interfaces, F-38000 Grenoble, France;5. Institute of Science and Technology for Ceramics (ISTEC) of the National Research Council (CNR), Via Granarolo 64, I-48018 Faenza, RA, Italy;1. Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK;2. Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK;3. Department of Materials, Imperial College London, London SW7 2AZ, UK |
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| Abstract: | A La0.6Sr0.4Fe0.8Co0.2O3–Ce0.8Gd0.2O1.9 (LSFCO–CGO) composite anode material was investigated for the direct electrochemical oxidation of methane in intermediate temperature solid oxide fuel cells (IT-SOFCs). A maximum power density of 0.17 W cm?2 at 800 °C was obtained with a methane-fed ceria electrolyte-supported SOFC. A progressive increase of performance was recorded during 140 h operation with dry methane. The anode did not show any structure degradation after the electrochemical testing. Furthermore, no formation of carbon deposits was detected by electron microscopy and elemental analysis. Alternatively, this perovskite material showed significant chemical and structural modifications after high temperature treatment in a dry methane stream in a packed-bed reactor. It is derived that the continuous supply of mobile oxygen anions from the electrolyte to the LSFCO anode, promoted by the mixed conductivity of CGO electrolyte at 800 °C, stabilises the perovskite structure near the surface under SOFC operation and open circuit conditions. |
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