Solid electrolyte fuel cell and manufacturing method thereof

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A solid electrolyte fuel cell including a protonic oxide conductor having a composition represented by Ba (Zr1-xCex)1-yMyAlzO3-α (M : one or more kinds of elements selected from a group of tri-valent rare earth elements and In, 1 ≥ x ≥ 0, 0.3 > y > 0, 0.04 > z ≥ 0, and 1.5 > α > 0); and an electrode that is mainly made of platinum and has catalysis properties; wherein an electrolyte has a film thickness of 300 µm or less, and a method of manufacturing the same are disclosed. The solid electrolyte fuel cell can obtain a cell output even at low temperatures equal to 500 degrees centigrade or less.