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 %.
