Monoclinic and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a single room type solid electrolyte fuel cell stably providing high current in a mixed gas of methane and oxygen even if operated at 600 deg.C or lower and to provide the manufacturing method of the single room type solid electrolyte fuel cell. SOLUTION : A positive electrode 2 of the single room solid electrolyte fuel cell is strontium-doped Ln1-x Srx CoO3-δ (wherein Ln is a rare-earth element), and a negative electrode 3 contains nickel, a composite oxide mainly comprising cerium oxide, and at least one element selected from palladium, platinum, rhodium, iridium, and ruthenium. The single room solid electrolyte fuel cell stably provides current in a mixed gas of methane and oxygen even at 600 deg.C or lower.