| abstract |
A cell structure which is provided with a cathode, an anode, and a solid electrolyte layer that has proton conductivity and is interposed between the cathode and the anode. The solid electrolyte layer contains a compound that has a perovskite structure, while containing zirconium, cerium and a rare earth element other than cerium. If T is the thickness of the solid electrolyte layer, the element ratio of the zirconium to the cerium at the position of 0.25T from the cathode-side surface of the solid electrolyte layer, namely Zr C /Ce C and the element ratio of the zirconium to the cerium at the position of 0.25T from the anode-side surface of the solid electrolyte layer, namely Zr A /Ce A satisfy Zr C /Ce C > Zr A /Ce A and Zr C /Ce C > 1. |