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Article

Stability and Reactivity of LSGM Electrolytes With Nickel-Based Ceramic Cathodes

[+] Author and Article Information
C. N. Munnings

 Department of Materials, Imperial College London, Prince Consort Road, London, SW7 2BP, United Kingdom s.skinner@imperial.ac.uk

S. J. Skinner1

 Department of Materials, Imperial College London, Prince Consort Road, London, SW7 2BP, United Kingdom s.skinner@imperial.ac.uk

G. Amow, P. S. Whitfield, I. J. Davidson

 ICPET, NRC Canada, 1200 Montreal Road, Ottawa, K1A 0R6, Canada

1

Author to whom all correspondence should be addressed; Tel: +44 (0)20 7594 6782; Fax: +44 (0)20 7584 3194

J. Fuel Cell Sci. Technol 2(1), 34-37 (Jul 27, 2004) (4 pages) doi:10.1115/1.1842780 History: Received April 07, 2004; Revised July 27, 2004

The surface of La0.9Sr0.1Ga0.8Mg0.2O3δ (LSGM 9182) has been examined through the use of secondary-ion mass spectrometry before and after surface modification by mechanical polishing. It was found that the cation stoichiometry varied at the surface in both cases. The effect of this change on the performance of the cathode material La2NiO4+δ was assessed through ac impedance spectroscopy of symmetrical cells prepared by depositing La2NiO4+δ on the surface of pellets of La0.9Sr0.1Ga0.8Mg0.2O3δ. An improvement in the cathode performance of these cells at temperatures above 500°C was found on electrolytes with elevated levels of strontium and magnesium at the surface.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Comparison of the SIMS responses of the surfaces of differently treated samples: (a) standard, (b) ground surface, and (c) untreated sintered surface

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Figure 2

SIMS response of sample heated to 1000°C for 24h

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Figure 3

Comparison of the ASR of the untreated sintered surface (diamonds) and the ground surface (squares)

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Figure 4

Comparison of the normalized ac impedance response for the untreated sintered sample (open squares) and the ground sample (open triangles) at ∼680°C

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Figure 5

Comparison of the ASR of the ground surface (diamonds) and the sample with surface annealed at 1000°C for 24h (triangles)

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