Solid oxide fuel cell stacks with barium and strontium ceramic b

Details Solid oxide fuel cell stacks with barium and strontium ceramic b Solid oxide fuel cell stacks with barium and strontium ceramic b

1996-08-20

1998-09-15

Bell, Bruce F.

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

429 27, 429 29, 429 30, 429 44, 429 45, 429 46, H01M 810

Patent

active

058076425

ABSTRACT:
A ceramic body based on barium and strontium titanates has a composition defined essentially by the formula Ba.sub.1-x Sr.sub.x TiO.sub.3, where x ranges from 0 to 1. The ceramic body is chemically and dimensionally stable in solid oxide fuel cell (SOFC) operation environments, which encounter oxidizing and reducing atmospheres at temperatures as high as 1,000.degree. C. In addition, the ceramic of which the body is comprised can be tailored to yield a ceramic in which the thermal expansion coefficient (CTE) is adjusted between 11.3.times.10.sup.-6 /.degree.C. and 12.4.times.10.sup.-6 /.degree.C. to match the CTE of the other SOFC materials, thereby avoiding the adverse effects of thermal stress. These features make the ceramic body especially suited for use as manifolds in SOFC stacks, or other non-electrical structural components, such as the inflow and outflow gas manifold materials, the stack housing, or other support structure or spacers in the stack, and the like.

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