The surface of (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 was assessed through ac impedance spectroscopy of symmetrical cells prepared by depositing on the surface of pellets of . An improvement in the cathode performance of these cells at temperatures above was found on electrolytes with elevated levels of strontium and magnesium at the surface.
Keywords:
solid oxide fuel cells,
secondary ion mass spectra,
surface composition,
solid electrolytes,
stoichiometry,
electrochemical electrodes,
nickel compounds,
lanthanum compounds,
strontium compounds,
gallium compounds,
ceramics,
cathodes
Topics:
Ceramics,
Electrolytes,
Nickel,
Stability,
Stoichiometry,
Magnesium (Metal),
Strontium,
Temperature
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