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Quarez, E., Kravchyk, K. V. & Joubert, O. (2012) Compatibility of proton conducting La6WO12 electrolyte with standard cathode materials. Solid State Ion. 216 19–24.
Added by: Laurent Cournède (2016-03-10 21:28:39) |
| Type de référence: Article DOI: 10.1016/j.ssi.2011.11.003 Numéro d'identification (ISBN etc.): 0167-2738 Clé BibTeX: Quarez2012 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: ba0.5sr0.5co0.8fe0.2o3-delta, Cathode, Compatibility, composite cathodes, diffraction, electrical-conductivity, la6wo12, oxide fuel-cells, proton conductivity, Solid Oxide Fuel Cells Créateurs: Joubert, Kravchyk, Quarez Collection: Solid State Ion. |
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Mixed ionic and electronic conductors (MIEC) such as LSM (La0.7Sr0.3MnO3-delta), LSCM (La0.7Sr0.25Cr0.5Mn0.5O3-delta) and BSCF (Ba0.5Sr0.5Co0.8Fe0.2O3-delta) have been investigated as potential cathode materials with La6WO12 (LWO) proton conducting electrolyte for use in protonic ceramic fuel cells (PCFC). Different cathode - LWO powder mixtures have been subjected to high temperature treatment (1150 degrees C during 144 h in air) and studied by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM). The analysis of the results reveals that LWO is chemically and mechanically stable with LSM and LSCM but reacts with BSCF. Symmetrical cells cathode/LWO/cathode have been studied by electrochemical impedance spectroscopy (EIS). The minimum of area specific resistance (ASR) values have been found for LSM cathode (in humidified air at 750 degrees C: ASR(LSM) = 4.3 Omega.cm(2); ASR(LSCM) = 15.5 Omega.cm(2); ASR(BSCF) = 9.7 Omega.cm(2)). Composite cathodes using a two-phase ceramic/ceramic (cer-cer) approach were also studied. In the case of LSM/LWO cathode cer-cer, it allows a significant decrease of the ASR value. (C) 2011 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |