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Title: Protective interlayer for high temperature solid electrolyte electrochemical cells

The invention is comprised of an electrically conducting doped or admixed cerium oxide composition with niobium oxide and/or tantalum oxide for electrochemical devices, characterized by the general formula: Nb{sub x}Ta{sub y}Ce{sub 1{minus}x{minus}y}O{sub 2} where x is about 0.0 to 0.05, y is about 0.0 to 0.05, and x+y is about 0.02 to 0.05, and where x is preferably about 0.02 to 0.05 and y is 0, and a method of making the same is also described. This novel composition is particularly applicable in forming a protective interlayer of a high temperature, solid electrolyte electrochemical cell, characterized by a first electrode; an electrically conductive interlayer of niobium and/or tantalum doped cerium oxide deposited over at least a first portion of the first electrode; an interconnect deposited over the interlayer; a solid electrolyte deposited over a second portion of the first electrode, the first portion being discontinuous from the second portion; and, a second electrode deposited over the solid electrolyte. The interlayer is characterized as being porous and selected from the group consisting of niobium doped cerium oxide, tantalum doped cerium oxide, and niobium and tantalum doped cerium oxide or admixtures of the same. The first electrode, an air electrode, is amore » porous layer of doped lanthanum manganite, the solid electrolyte layer is a dense yttria stabilized zirconium oxide, the interconnect layer is a dense, doped lanthanum chromite, and the second electrode, a fuel electrode, is a porous layer of nickel-zirconium oxide cermet. The electrochemical cell can take on a plurality of shapes such as annular, planar, etc. and can be connected to a plurality of electrochemical cells in series and/or in parallel to generate electrical energy. 5 figs.« less
Inventors:
; ;
Issue Date:
OSTI Identifier:
228048
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (United States) PTO; SCA: 300501; 300503; PA: EDB-96:078873; SN: 96001584036
Patent Number(s):
US 5,516,597/A/
Application Number:
PAN: 8-334,990
Contract Number:
AC21-80ET17089
Resource Relation:
Other Information: PBD: 14 May 1996
Research Org:
Westinghouse Electric Corporation
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; SOLID ELECTROLYTE FUEL CELLS; DESIGN; ELECTRODES; BATTERY SEPARATORS; NIOBIUM OXIDES; TANTALUM OXIDES; CERIUM OXIDES; DOPED MATERIALS; ZIRCONIUM OXIDES; LANTHANUM OXIDES; CHROMIUM OXIDES; CERMETS; NICKEL; MANGANESE OXIDES