Solid oxide fuel cell
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United States of America Patent
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Sep 7, 2004
Grant Date -
Jun 20, 2002
app pub date -
Oct 22, 2001
filing date -
Oct 23, 2000
priority date (Note) -
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Abstract
A solid oxide fuel cell in which the catalytic activity of a fuel electrode is high and in which no poisoning by carbon occurs even when internal reforming is performed under a condition of a low S/C ratio and further in which the time course degradation of the fuel electrode is less when internal reforming is performed. In a solid oxide fuel cell having an oxide ion conductive solid electrolyte, and a fuel electrode and an air electrode connected to both faces thereof, a cermet of a catalyst and of the second solid electrolyte whose oxide ion conductivity is more than or equal to 0.2 S/cm at 1000 .degree. C. is used as the fuel electrode. More specifically, it is desirable that the second solid electrolyte is scandia-stabilized zirconia (ScSZ) containing 9 to 12 mol % of scandia. In addition, the second solid electrolyte may further be ScSZ containing yttria or ceria less than or equal to 2 mol %. Furthermore, the second solid electrolyte may be a composite material of ScSZ and alumina less than or equal to 2 wt %.
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