High performance cathodes for solid oxide fuel cells
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United States of America Patent
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Oct 14, 2003
Grant Date -
Nov 28, 2002
app pub date -
Apr 10, 2001
filing date -
Apr 10, 2001
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Abstract
The present invention relates to a multi-layered and multifunctional cathode in solid oxide fuel cells having high conductivity, high catalytic activity, minimized coefficient of thermal expansion (CTE) mismatch, excellent compatibility to other portions of the fuel cell, and reduced temperature operation. The cathode comprises a conductive layer, a catalyst layer and a graded composition layer. The conductive layer has a first density, the catalyst layer has a second density that is less than the first density, and the graded composition layer is characterized by a graded electronic conductivity and a graded ionic conductivity.
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