Cationic Interdiffusion at the SOFC Electrolyte/Cathode Interface in La2Mo2O9/La0.8Sr0.2MnO3-δ
File(s)
Accepted version
Supporting information
Author(s)
Skinner, SJ
Ravella, UK
liu, J
corbel, G
lacorre, P
Type
Journal Article
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-δ (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 °C, 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.
Date Issued
2017-07-11
Date Acceptance
2017-06-26
Citation
Chemistry Select, 2017, 2 (20), pp.5616-5623
ISSN
2365-6549
Publisher
Wiley
Start Page
5616
End Page
5623
Journal / Book Title
Chemistry Select
Volume
2
Issue
20
Copyright Statement
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/slct.201701180/abstract
Publication Status
Published