Design of experiment approach applied to reducing and oxidizing tolerance of anode supported solid oxide fuel cell. Part II: Electrical, electrochemical and microstructural characterization of tape-cast cells |
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Authors: | Antonin Faes Zacharie WuilleminPietro Tanasini Nicola AccardoStefano Modena Hans J SchindlerMarco Cantoni Henning Lübbe Stefan DiethelmAïcha Hessler-Wyser Jan Van herle |
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Affiliation: | a Interdisciplinary Centre for Electron Microscopy (CIME), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland b Industrial Energy Systems Laboratory (LENI), EPFL, CH-1015 Lausanne, Switzerland c SOFCPOWER S.r.l., Pergine Vals., Italy d Group of Electrochemical Engineering (GGEC), EPFL, CH-1015 Lausanne, Switzerland e High Performance Ceramics, EMPA, CH-8600 Dübendorf, Switzerland f Powder Technology Laboratory (LTP), EPFL, CH-1015 Lausanne, Switzerland |
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Abstract: | One of the major limitations of the nickel (Ni) - yttria-stabilized zirconia (YSZ) anode support for solid oxide fuel cells (SOFC) is its low capability to withstand transients between reducing and oxidizing atmospheres (“RedOx” cycle), owing to the Ni-to-NiO volume expansion. This work presents results on different anode supports fabricated by tape casting. Three compositions are prepared, as the outcome of a preceding design of experiment approach. The NiO proportion is 40, 50 and 60 wt% of the anode composite.The anode support characteristics like shrinkage during sintering, in-situ conductivity at high temperature, electrochemical performance and tolerance against RedOx cycles have been measured. Performance up to 0.72 W cm−2 (0.62 V, 800 °C) is recorded for the 60 wt% NiO sample on small cells. The open circuit voltage is maintained within ±5 mV after 10 full RedOx cycles at 800 °C and one at 850 °C. Performances tend to be stabilized after one or multiple RedOx cycles. The microstructural observations show round Ni particles after the first reduction; after a RedOx cycle, the Ni particles include micro-porosities that are stable under humidified reducing atmosphere for more than 300 h. |
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Keywords: | RedOx cycling SOFC reoxidation Solid oxide fuel cells Ni-YSZ anode support Cermet electrical conductivity Degradation |
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