Electrochemical reaction single cell

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[Problem] The peeling between the first air electrode layer of the air electrode and the member other than the first air electrode layer is suppressed. Solution : When the electrochemical reaction single cell is a member other than the first air electrode layer is joined to the surface on one side of the first air electrode layer, and the sum of the molars of the element located at site A of the first material (perovskite oxide represented by ABO3) contained in the first air electrode layer is At, and when the sum of the number of moles of elements located at the B site of the first material is Bt, the formula : At / Bt ≦1. The average crystallin size of the first material that satisfies 025 and is contained in the first air electrode layer is smaller than the average crystallet size of the second material (at least one of the rare earth element doped cerium oxide and the rare earth element doped zirconium oxide). [Selection Figure]Figure 7