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Title: Low cost stable air electrode material for high temperature solid oxide electrolyte electrochemical cells

A low cost, lanthanide-substituted, dimensionally and thermally stable, gas permeable, electrically conductive, porous ceramic air electrode composition of lanthanide-substituted doped lanthanum manganite is provided which is used as the cathode in high temperature, solid oxide electrolyte fuel cells and generators. The air electrode composition of this invention has a much lower fabrication cost as a result of using a lower cost lanthanide mixture, either a natural mixture or an unfinished lanthanide concentrate obtained from a natural mixture subjected to incomplete purification, as the raw material in place of part or all of the higher cost individual lanthanum. The mixed lanthanide primarily contains a mixture of at least La, Ce, Pr, and Nd, or at least La, Ce, Pr, Nd and Sm in its lanthanide content, but can also include minor amounts of other lanthanides and trace impurities. The use of lanthanides in place of some or all of the lanthanum also increases the dimensional stability of the air electrode. This low cost air electrode can be fabricated as a cathode for use in high temperature, solid oxide fuel cells and generators.
Inventors:
 [1];  [2];  [3];  [4];  [5]
  1. (Monroeville, PA)
  2. (Export, PA)
  3. (Churchill Boro, PA)
  4. (Penn Township, PA)
  5. (Delmont, PA)
Issue Date:
OSTI Identifier:
871222
Assignee:
Westinghouse Electric Corporation (Pittsburgh, PA) NETL
Patent Number(s):
US 5686198
Contract Number:
FC21-91MC28055
Research Org:
Westinghouse Electric Corporation (Pittsburgh, PA)
Country of Publication:
United States
Language:
English
Subject:
cost; stable; air; electrode; material; temperature; solid; oxide; electrolyte; electrochemical; cells; lanthanide-substituted; dimensionally; thermally; gas; permeable; electrically; conductive; porous; ceramic; composition; doped; lanthanum; manganite; provided; cathode; fuel; generators; fabrication; result; lanthanide; mixture; natural; unfinished; concentrate; obtained; subjected; incomplete; purification; raw; individual; mixed; primarily; contains; content; minor; amounts; lanthanides; trace; impurities; increases; dimensional; stability; fabricated; fuel cell; minor amounts; electrolyte fuel; temperature solid; air electrode; electrochemical cells; fuel cells; electrochemical cell; electrically conductive; oxide fuel; solid oxide; electrode material; oxide electrolyte; thermally stable; electrolyte electrochemical; electrode composition; porous ceramic; minor amount; trace impurities; raw material; doped lanthanum; lanthanum manganite; gas permeable; fabrication cost; /429/264/

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