| 摘要 |
PROBLEM TO BE SOLVED: To restrain metal in a fuel electrode layer from being sintered by controlling the mean crystal grain size of ZrO2 and CeO2 particles in the fuel electrode layer so as to become larger on the surface thereof than in a part in contact with a solid electrolyte. SOLUTION: A fuel electrode layer 33 is formed out of at least one type of metal selected from Ni, Co, Ti and W, and ZrO2 and/or CeO2 , and the mean crystal grain size of ZrO2 and/or CeO2 on the surface of the fuel electrode layer 33 is made larger than a part in contact with a solid electrolyte. In this case, the mean crystal grain size of ZrO2 and/or CeO2 in the fuel electrode layer 33 is preferably made large gradually from the part in contact with the solid electrolyte toward the surface layer. In addition, 40wt.% to 90wt.% of one type of metal selected from Ni, Co and Ti and W is preferably made present in the fuel electrode layer 33. |
