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Corrugated electrode/electrolyte iInterfaces in SOFC : theoretical and experimental development

Abstract : The present work proposes to explore how the presence of a periodic pattern at electrode/electrolyte interfaces of a SOFC could impact the electrochemical performances, from theoretical and experimental points of view. The model results demonstrate that a patterned interfaces along with an electrolyte having a thickness smaller than the dimensions of the pattern, lead to a strong increase of the exchange surface, hence to the exchange currents (up to 64%) with respect to flat interfaces. With the use of laboratory standard ceramic processes, this architecturation was experimented on YSZ-Ni self supported anodes on top of which a thin YSZ electrolyte was deposited. The first electrical tests for such a cell with a non-optimized thickness show an increase of the current density with respect to a cell with flat interfaces, from 130 to 300 mA cm-2 at 0.7 V, that is even higher than anticipated by the modeling.
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Submitted on : Friday, June 22, 2018 - 3:34:19 PM
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Anthony Chesnaud, Francesco Delloro, Maya Geagea, André-Pierre Abellard, J. Ouyang, et al.. Corrugated electrode/electrolyte iInterfaces in SOFC : theoretical and experimental development. ECS Transactions, Electrochemical Society, Inc., 2017, 78, pp.1851-1863. ⟨10.1149/07801.1851ecst⟩. ⟨hal-01821589⟩



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