Solid oxide fuel cell cathode material

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A solid oxide fuel cell includes a porous anode, a dense electrolyte in contact with the porous anode, and a porous cathode in contact with the dense electrolyte. The porous cathode is characterized by a single-phase structure of Brownmillerite or Srebrodolskite, the composition thereof having the formula [in-line-formulae](Ca2-xAx)(Fe2-yBy)O5±z [/in-line-formulae] wherein : A is at least one element selected from the group : rare earth elements, Bi, and alkaline elements; B is at least one element selected from the group : Al, Ga, In, Mg, Si, and transition metal elements; 0≦x<2; 0≦y<2; and z is a variable, the value of which is such that the overall composition has a generally neutral charge state.