Electrochemical reaction single cell and electrochemical reaction cell stack

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Problem : In the electrochemical reaction single cell, the peeling between the first air electrode layer of the air electrode and the second air electrode layer is suppressed. Solution : In an electrochemical reaction single cell, the average crystallin size of the first material (perovskite-type oxide) contained in the first air electrode layer is the average crystallin size of the second material (perovskite-type oxide) contained in the second air electrode layer; It is larger than any of the average crystallin sizes of the third material (at least one of the rare earth element doped cerium oxide and the rare earth element doped zirconium oxide). [Selection Figure]Figure 7