CELL, CELL STACK UNIT, ELECTROCHEMICAL MODULE, AND ELECTROCHEMICAL APPARATUS

[Object] To provide a cell, a cell stack, an electrochemical module and an electrochemical apparatus that can suppress decrease in output power. [Solution] A cell includes a solid oxide electrolyte layer , a fuel electrode layer on one of the main surfaces of the electrolyte layer , and an oxygen electrode layer on the other. The oxygen electrode layer contains a plurality of pores, and the pore size distribution observed at a section of the oxygen electrode layer has at least three peaks (a first peak p, a second peak p and a third peak p). This structure leads to a cell, a cell stack, an electrochemical module and an electrochemical apparatus that can suppress decrease in output power.