The design of a DCEFC with an exchangeable generator electrode made of a thin film of a pure oxide deposited on a conductive substrate is described. The cell was tested with Pt, and applied to the investigation of the oxygen reduction reaction (err) on film or pure copper manganite Cu1+xMn2-xO4 (0 < x < 0.4) spray deposited on nickel. The kinetics depends on the copper content, but is invariant with the electrode potential.