Modelling of cells,stacks and systems based around metal-supported planar IT-SOFC cells with CGO electrolytes operating at 500–600 °C |
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| Affiliation: | 1. Ceres Power Ltd., Unit 18, Denvale Trade Park, Haslett Avenue East, Crawley RH10 1SS, UK;2. Department of Chemical Engineering and Chemical Technology, Imperial College London, London SW7 2AZ, UK;1. Departamento de Química, U.D. Química Inorgánica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain;2. Centre de Recherche Public Henri Tudor, L-1855 Luxembourg-Kirchberg, Luxembourg;3. Instituto de Microelectrónica de Barcelona, Centro Nacional de Microelectrónica, IMB-CNM (CSIC), 08193, Bellaterra, Barcelona, Spain;1. Department of Materials Engineering, Federal University of Rio Grande do Sul, 9500, Av. Bento Gonçalves – Prédio 74 – Room 211, 91501-970 Porto Alegre, RS, Brazil;2. National Research Council – Institute for Fuel Cell Innovation, 4250 Wesbrook Mall, V6T 1W5 Vancouver, BC, Canada;1. Plansee SE, 6600 Reutte, Austria;2. Fraunhofer Institute for Surface Engineering and Thin Films, Bienroder Weg 54 E, 38108 Braunschweig, Germany;3. Forschungszentrum Jülich, Institute of Energy and Climate Research (IEK), Wilhelm-Johnen-Straße, 52428 Jülich, Germany;1. University of St Andrews, School of Chemistry, KY16 9ST, St Andrews, United Kingdom;2. TOPSOE FUEL CELL A/S, Nymøllevej 66, DK − 2800, Kgs. Lyngby, Denmark;3. Technical University of Denmark, Department of Energy Conversion and Storage, Frederiksborgvej 399, P.O. Box 49, Bygning 778, 4000 Roskilde, Denmark |
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| Abstract: | Ceres Power Ltd. has developed a novel solid oxide fuel cell (SOFC) concept based upon depositing a thick film positive–electrolyte–negative (PEN) structure on a porous stainless steel substrate, and using gadolinia-doped ceria (CGO) as the electrolyte material. This approach allows the temperature of operation to be reduced to below 600 °C, well below the conventional SOFC operating temperature. Historically, the use of CGO as an electrolyte material has been viewed as impractical because of its poor stability in reducing atmospheres at elevated temperatures, leading to electronic conductivity, which effectively short-circuits the cell leading to a loss of efficiency. In this work, a model is developed which accurately simulates the polarisation behaviour of a Ceres cell including electronic leakage. The parameters of this model are set to give the best possible fit to experimental data. This cell model is then incorporated into a model of a 2.5 kWe stack, and the stack model into a natural gas fuelled combined heat and power (CHP) system model. The system model demonstrates that high operating efficiencies are achievable for such a system based upon IT-SOFC cells with CGO electrolytes. |
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