초록 ▼

An electrochemical device for separating oxygen from an oxygen-containing gas comprises a plurality of planar ion-conductive solid electrolyte plates and electrically-conductive gas-impermeable interconnects assembled in a multi-cell stack. Electrically-conductive anode and cathode material is appli

An electrochemical device for separating oxygen from an oxygen-containing gas comprises a plurality of planar ion-conductive solid electrolyte plates and electrically-conductive gas-impermeable interconnects assembled in a multi-cell stack. Electrically-conductive anode and cathode material is applied to opposite sides of each electrolyte plate. A gas-tight anode seal is bonded between the anode side of each electrolyte plate and the anode side of the adjacent interconnect. A biasing electrode, applied to the anode side of each electrolyte plate between the anode seal and the edge of the anode, eliminates anode seal failure by minimizing the electrical potential across the seal. The seal potential is maintained below about 40 mV and preferably below about 25 mV. A gas-tight seal is applied between the cathode sides of each electrolyte plate and the adjacent interconnect such that the anode and cathode seals are radially offset on opposite sides of the plate. The combination of biasing electrodes and offset seals is particularly effective in eliminating anode seal failure.

대표청구항 ▼

[ We claim:] [1.] An electrically insulating support material between an electrically-conducting interconnect and an electrolyte in an electrochemical device for separating oxygen from an oxygen-containing gas which material is made by firing a mixture comprising inorganic oxide glass or glass-ceram

[ We claim:] [1.] An electrically insulating support material between an electrically-conducting interconnect and an electrolyte in an electrochemical device for separating oxygen from an oxygen-containing gas which material is made by firing a mixture comprising inorganic oxide glass or glass-ceramic combined with one or more electrically insulating ceramics at above about 700.degree. C. to yield an electrically insulating support material, wherein the coefficient of thermal expansion of the mixture after firing differs from the coefficient of thermal expansion of the electrolyte or the coefficient of thermal expansion of the interconnect by less than about 2 micrometer/(meter.cndot..degree. C.).