Chemical compatibility of alternative perovskite oxide SOFC cathodes with doped lanthanum gallate solid electrolyte

Kostogloudis, GC; Ftikos, C; Ahmad-Khanlou, A; Naoumidis, A; Stover, D

dc.contributor.author	Kostogloudis, GC	en
dc.contributor.author	Ftikos, C	en
dc.contributor.author	Ahmad-Khanlou, A	en
dc.contributor.author	Naoumidis, A	en
dc.contributor.author	Stover, D	en
dc.date.accessioned	2014-03-01T01:15:30Z
dc.date.available	2014-03-01T01:15:30Z
dc.date.issued	2000	en
dc.identifier.issn	0167-2738	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13547
dc.subject	SOFC	en
dc.subject	lanthanum gallate solid electrolyte	en
dc.subject	cathode/electrolyte chemical compatibility	en
dc.subject	SEM/EDX	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	FUEL-CELLS	en
dc.subject.other	LAGAO3	en
dc.subject.other	MAGNESIUM	en
dc.subject.other	STRONTIUM	en
dc.subject.other	CONDUCTOR	en
dc.title	Chemical compatibility of alternative perovskite oxide SOFC cathodes with doped lanthanum gallate solid electrolyte	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0167-2738(00)00721-9	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0167-2738(00)00721-9	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	This paper reports on the investigations of the chemical compatibility between SOFC cathode materials with compositions Pr0.8Sr0.2Co0.2Mn0.8O3-delta, Pr0.8Sr0.2Co0.2Fe0.8O3-delta, Pr0.8Sr0.2Co0.3Mn0.7O3-delta and Pr0.75Sr0.2Co0.2Mn0.8O3-delta and the electrolyte materials with compositions La0.8Sr0.2Ga0.9Mg0.1O3-delta, and La0.9Sr0.1Ga0.8Mg0.2O3-delta. The lanthanum gallate electrolyte with 20 mol.% Sr contained two additional phases, namely, LaSrGa3O7 and LaSrGaO4, while that with 10 mol.% Sr was formed in nearly single phase. Two types of experiments were performed: (a) reactivity experiments of powder mixtures and (b) diffusion experiments in cathode/electrolyte double-layer pellets. No reaction products were detected by XRD. High Co diffusion into the electrolyte was identified with SEM/EDX in all diffusion experiments examined. The transition metals diffuse in the order Mn < Fe < Co. La, Pr and Ga show a smaller tendency for diffusion. The diffusion of transition metal cations into the electrolyte La0.8Sr0.2Ga0.9Mg0.1O3-delta caused the destabilisation and disappearance of the second phases in the interdiffusion zone. In the case of the A-site deficient cathode, the formation of LaSrGa3O7 second phase was identified on the electrolyte side, near the interdiffusion zone. (C) 2000 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	SOLID STATE IONICS	en
dc.identifier.doi	10.1016/S0167-2738(00)00721-9	en
dc.identifier.isi	ISI:000165283100014	en
dc.identifier.volume	134	en
dc.identifier.issue	1-2	en
dc.identifier.spage	127	en
dc.identifier.epage	138	en