Multi-scale analysis of the diffusion barrier layer of gadolinia-doped ceria in a solid oxide fuel cell operated in a stack for 3000 h
BALLESTEROS, Bélen
Catalan Institute of Nanoscience and Nanotechnology = Institut Català de Nanociència i Nanotecnologia [ICN2]
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Catalan Institute of Nanoscience and Nanotechnology = Institut Català de Nanociència i Nanotecnologia [ICN2]
Langue
en
Article de revue
Ce document a été publié dans
Journal of Power Sources. 2017, vol. 344, p. 141-151
Elsevier
Résumé en anglais
The state-of-the-art materials for SOFCs are yttria-stabilized zirconia as electrolyte and lanthanum strontium cobalt ferrite as cathode. However, the formation of insulating phases between them requires the use of diffusion ...Lire la suite >
The state-of-the-art materials for SOFCs are yttria-stabilized zirconia as electrolyte and lanthanum strontium cobalt ferrite as cathode. However, the formation of insulating phases between them requires the use of diffusion barriers, typically made of gadolinia doped ceria. The study of the stability of this layer during the fabrication and in operando is currently one of the major goals of the SOFC industry. In this work, the cation inter-diffusion at the cathode/barrier layer/electrolyte region is analysed for an anode-supported cell industrially fabricated by conventional techniques, assembled in a short-stack and tested under real operation conditions for 3000 h. A comprehensive study of this cell, and an equivalent non-operated one, is performed in order to understand the inter-diffusion mechanisms with possible effects on the final performance. The analyses evidence that the cation diffusion is occurring during the fabrication process. Despite the significant diffusion of Ce,Gd, Zr, Y and Sr cations, the formation of typically reported CGO-YSZ solid solution is not observed while the presence of isolated grains of SrZrO3 is proved. All in all, this study presents new insights into the stability of the typically employed diffusion barriers for solid oxide cells that will guide future strategies to improve their performance and durability.< Réduire
Mots clés en anglais
Strontium
Zirconium
Cation diffusion
SrZrO3
CGO interlayer
SOFC
Raman spectroscopy
Origine
Importé de halUnités de recherche