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Fuel cell tubes and method of making same

United States Patent

5,993,985
November 30, 1999
View the Complete Patent at the US Patent & Trademark Office
A method of manufacturing porous ceramic tubes for fuel cells with improved properties and higher manufacturing yield is disclosed. The method involves extruding a closed end fuel cell tube, such as an air electrode of a solid oxide fuel cell, in which the closed end also functions as the sintering support. The resultant fuel cell tube has a superior porosity distribution which allows improved diffusion of oxygen at the closed end of the tube during operation of the fuel cell. Because this region has the highest current density, performance enhancement and improved reliability of the fuel cell tube result. Furthermore, the higher manufacturing yield associated with the present method decreases the overall fuel cell cost.
Borglum; Brian P. (Edgewood, PA)
Siemens Westinghouse Power Corporation (Orlando, FL)
09/ 058,067
April 9, 1998
GOVERNMENT CONTRACT The Government of the United States of America has certain rights in this invention pursuant to Contract No. DE-FC21-91MC28055 awarded by the U.S. Department of Energy.