Patent ID: 6852204

Claim:
A wall construction for an electrolytic cell to separate oxygen from an oxygen comprising gas, said wall construction comprising: an electrolyte layer formed of an ionic conductor; the electrolyte layer located between an anode and cathode each of porous configuration and formed by at least an anode layer and a cathode layer, respectively; current conducting layers overlying the cathode and anode opposite to the electrolyte layer; said electrolyte layer and said cathode layer being no greater than about 200 microns thick and about 500 microns thick, respectively, said anode layer supporting said electrolyte layer and said cathode layer; said cathode comprising an electrically conductive noble metal or noble metal alloy, a mixed conductor, and said ionic conductor; said anode comprising said mixed conductor; and said cathode having sufficient amounts of said electrically conductive noble metal or noble metal alloy and said mixed conductor such that the electrical resistance of said cathode is no more than about 70 percent of combined resistance of said anode and cathode.