Aug 11, 2009

High-DOE awards Temperature Viscous Sealing Glasses for Solid Oxide Fuel Cells

Solid Oxide Fuel Cells (SOFCs) are multi-layered structures formed primarily of high-purity metal oxides, including an ionic conducting electrolyte, which generate electricity from the electrochemical oxidation of a fuel source. Planar SOFC configurations are relatively simple to manufacture and have greater power densities and efficiencies than other configurations [1,2], but require hermetic seals to prevent mixing of the fuel and oxidant streams within the cell stack and to seal the stack to the system manifold.

The seals must have a low electrical conductivity and must be chemically and mechanically stable in a high temperature reactive environment (moist reducing and/or oxidizing conditions). The seals should exhibit no deleterious interfacial reactions with other cell components, should be created at a low enough temperature to avoid damaging cell components (under 900ºC for some materials), and should not migrate or flow from the designated sealing region during sealing or cell operation because of any applied load.