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Title: Protective interlayer for high temperature solid electrolyte electrochemical cells

The invention comprises 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-x-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. This novel composition is particularly applicable in forming a protective interlayer of a high temperature, solid electrolyte electrochemical cell (10), characterized by a first electrode (12); an electrically conductive interlayer (14) of niobium and/or tantalum doped cerium oxide deposited over at least a first portion (R) of the first electrode; an interconnect (16) deposited over the interlayer; a solid electrolyte (18) deposited over a second portion of the first electrode, the first portion being discontinuous from the second portion; and, a second electrode (20) deposited over the solid electrolyte. The interlayer (14) 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 (12), anmore » air electrode, is a porous layer of doped lanthanum manganite, the solid electrolyte layer (18) is a dense yttria stabilized zirconium oxide, the interconnect layer (16) is a dense, doped lanthanum chromite, and the second electrode (20), a fuel electrode, is a porous layer of nickel-zirconium oxide cermet. The electrochemical cell (10) 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.« less
Inventors:
 [1];  [2];  [3]
  1. (Export, PA)
  2. (Manor, PA)
  3. (Angola, IN)
Issue Date:
OSTI Identifier:
870413
Assignee:
Westinghouse Electric Corporation (Pittsburgh, PA) NETL
Patent Number(s):
US 5516597
Contract Number:
AC21-80ET17089
Research Org:
WESTINGHOUSE ELECTRIC CORP
Country of Publication:
United States
Language:
English
Subject:
protective; interlayer; temperature; solid; electrolyte; electrochemical; cells; comprises; electrically; conducting; doped; admixed; cerium; oxide; composition; niobium; tantalum; devices; characterized; formula; nb; 1-x-y; 05; 02; preferably; method; novel; particularly; applicable; forming; cell; 10; electrode; 12; conductive; 14; deposited; portion; interconnect; 16; 18; discontinuous; 20; porous; selected; consisting; admixtures; air; layer; lanthanum; manganite; dense; yttria; stabilized; zirconium; chromite; fuel; nickel-zirconium; cermet; plurality; shapes; annular; planar; etc; connected; series; parallel; generate; electrical; energy; yttria stabilized; porous layer; oxide composition; niobium oxide; doped cerium; protective interlayer; electrochemical devices; cerium oxide; electrolyte layer; temperature solid; particularly applicable; air electrode; electrochemical cells; electrical energy; electrochemical cell; electrically conductive; solid electrolyte; electrically conducting; zirconium oxide; electrolyte electrochemical; fuel electrode; doped lanthanum; electrochemical device; lanthanum manganite; lanthanum chromite; stabilized zirconium; oxide deposited; novel composition; interconnect layer; generate electric; tantalum oxide; /429/