POSITIVE ELECTRODE CATALYST AND DEVICE

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A positive electrode catalyst, for use in a positive electrode in a device provided with the positive electrode and a negative electrode, in which a reaction represented by 4 OH−→O2+2 H2O+4 e− is performed on a side of the positive electrode. The positive electrode catalyst includes a layered metal oxide, wherein the layered metal oxide is a Ruddlesden-Popper type layered perovskite represented by (La1−xAx) (Fe1−yBy)3(Sr1−zCz)3O10−a wherein, A is a rare earth element other than La, B is a transition metal other than Fe, and C is an alkaline earth metal other than Sr; and x satisfies an expression : 0≦x<1, y satisfies an expression : 0≦y<1, z satisfies an expression : 0≦z<1, and a satisfies an expression : 0≦a≦3.