NDLI: <i>In situ</i> compatibility studies of lanthanum nickelate with a ceria-based electrolyte for SOFC composite cathodes

Content Provider	Royal Society of Chemistry (RSC)
Author	Skinner, S. J. Tang, C. C. Sayers, R. Parker, J. E.
Copyright Year	2012
Abstract	The phase stability and compatibility of intermediate temperature solid oxide fuel cell (IT-SOFC) composite cathodes of lanthanum nickelate, La2NiO4+δ (LNO), and ceria-gadolinium oxide, Ce0.9Gd0.1O2−δ (CGO10), have been investigated by high resolution synchrotron X-ray diffraction (XRD). No reaction was observed between LNO and CGO10 at temperatures of up to 900 °C when the composite is open to an ambient air environment. However, in a sealed capillary environment the 50 : 50 wt% LNO:CGO10 composite undergoes a partially reversible reaction at temperatures of 750 °C and above, whereby LNO decomposes to La2O3 and Ni. Changes in the CGO10 Bragg peaks indicate that this component is actively involved in this process. This study shows that the phase stability of LNO:CGO10 composites is highly dependent on oxygen partial pressure. In addition, it is observed that ex-situXRD is insufficient to determine the presence of reactivity in composite cathodes and that high resolution in situXRD measurements are required to obtain details of the complexity of phase stability in SOFC composite cathodes.
Starting Page	3536
Ending Page	3543
Page Count	8
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	8
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm14384d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SOFC Solid oxide fuel cell Lanthanum Nickel oxides Synchrotron X-ray crystallography Reversible reaction Oxygen Partial pressure
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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