ELECTROCHEMICAL CELL

An electrochemical cell is disclosed having a porous metal support, at least one layer of a first electrode on the porous metal support, a first electron-blocking electrolyte layer of rare earth doped zirconia on the at least one layer of the first electrode, and a second bulk electrolyte layer of rare earth doped ceria on the first electron-blocking electrolyte layer. The first electron-blocking electrolyte layer of rare earth doped zirconia may have a thickness of 0.5 μm or greater, and the second bulk electrolyte layer of rare earth doped ceria may have a thickness of 4 μm or greater.