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
Morales, Miguel (Institut de Recerca en Energia de Catalunya)
Miguel Pérez, Verónica (Institut de Recerca en Energia de Catalunya)
Tarancón Rubio, Albert (Institut de Recerca en Energia de Catalunya)
Slodczyk, A. (Institut de Recerca en Energia de Catalunya)
Torrell Faro, Marc (Institut de Recerca en Energia de Catalunya)
Ballesteros, Belén (Institut Català de Nanociència i Nanotecnologia)
Ouweltjes, Jan Pieter (HTceramix SA)
Bassat, Jean-Marc (CNRS. ICMCB)
Montinaro, Dario (SOLIDPower SpA)
Morata, Alex (Institut de Recerca en Energia de Catalunya)

Date:	2017
Abstract:	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 SrZrOis 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.
Grants:	European Commission 621207 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Strontium ; Zirconium ; Cation diffusion ; SrZrO3 ; CGO interlayer ; SOFC ; Raman spectroscopy
Published in:	Journal of power sources, Vol. 344 (March 2017) , p. 141-151, ISSN 0378-7753

DOI: 10.1016/j.jpowsour.2017.01.109

Postprint 20 p, 977.8 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles