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Cationic Interdiffusion at the SOFC Electrolyte/Cathode Interface in La2Mo2O9 /La0.8Sr0.2MnO3-δ

Abstract : In this work cation diffusion between a La2Mo2O9 (LM) ionic conductor and the conventional Solid Oxide Fuel Cell (SOFC) cathode material La0.8Sr0.2MnO3-delta (LSM), was probed using secondary ion mass spectrometry (SIMS), and diffusion coefficients of Sr, Mo and Mn cations within both materials evaluated. Diffusion coefficients extracted from samples with a Sr solution deposited on the LM pellets and from a Mo solution deposited on LSM pellets were found to be orders of magnitude higher than the cross-diffusion through the interface between two dense pellets in direct contact. These differences may be due to uncertainty in determining the interface position, or to a real dependence on the source of the diffusing cation. In the most favorable case, that of pellets in direct contact, extrapolation of diffusion coefficients down to a typical SOFC operating temperature, 800 8C, show that Mo diffusion in LSM (diffusion coefficient ~ 10-14 cm2.s-1) is much higher than Sr or Mn diffusion in LM, and incompatible with use in a SOFC device, unless an efficient buffer layer is used.
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Contributeur : Gwenaël Corbel Connectez-vous pour contacter le contributeur
Soumis le : vendredi 14 décembre 2018 - 11:39:36
Dernière modification le : lundi 8 novembre 2021 - 16:26:05

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Uday Ravella, Jingjing Liu, Gwenaël Corbel, Stephen Skinner, Philippe Lacorre. Cationic Interdiffusion at the SOFC Electrolyte/Cathode Interface in La2Mo2O9 /La0.8Sr0.2MnO3-δ. ChemistrySelect, 2017, 2 (20), pp.5616-5623. ⟨10.1002/slct.201701180⟩. ⟨hal-01955288⟩



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