Disclosed is a sealing glass composition that turns, when fired at a temperature of 900-1150 C., into a crystallized glass having a thermal expansion coefficient of 80-11010.sup.7/ C. in the range of 50-850 C. The composition is substantially free of both boron oxide and barium oxide, and comprises SiO.sub.2: 43-53 mol %, CaO: 12-33 mol %, MgO: 12-33 mol %, La.sub.2O.sub.3: 1-7 mol %, and ZnO: 0-4.5 mol %.

Disclosed is a sealing glass composition that turns, when fired at a temperature of 900-1150 C., into a crystallized glass having a thermal expansion coefficient of 80-11010.sup.7/ C. in the range of 50-850 C. The composition is substantially free of both boron oxide and barium oxide, and comprises SiO.sub.2: 43-53 mol %, CaO: 12-33 mol %, MgO: 12-33 mol %, La.sub.2O.sub.3: 1-7 mol %, and ZnO: 0-4.5 mol %.

A caulk composition includes at least one powder component and at least one binder component, such that the powder component has a particle size distribution in the range of 95% less than 25 m and 90% greater than 1 m. A molten carbonate fuel cell (MCFC) includes a fuel cell stack, a manifold, and the caulk composition disposed in between the fuel cell stack and the manifold.

A caulk composition includes at least one powder component and at least one binder component, such that the powder component has a particle size distribution in the range of 95% less than 25 m and 90% greater than 1 m. A molten carbonate fuel cell (MCFC) includes a fuel cell stack, a manifold, and the caulk composition disposed in between the fuel cell stack and the manifold.

A solid oxide fuel cell (SOFC) stack including a plurality of SOFCs and a plurality of interconnects. Each interconnect is located between two adjacent SOFCs, and each interconnect contains a Mn or Co containing, electrically conductive metal oxide layer on an air side of the interconnect. The SOFC stack also includes a barrier layer located between the electrically conductive metal oxide layer and an adjacent SOFC. The barrier layer is configured to prevent Mn or Co diffusion from the electrically conductive metal oxide layer to the adjacent SOFC.

A solid oxide fuel cell (SOFC) stack including a plurality of SOFCs and a plurality of interconnects. Each interconnect is located between two adjacent SOFCs, and each interconnect contains a Mn or Co containing, electrically conductive metal oxide layer on an air side of the interconnect. The SOFC stack also includes a barrier layer located between the electrically conductive metal oxide layer and an adjacent SOFC. The barrier layer is configured to prevent Mn or Co diffusion from the electrically conductive metal oxide layer to the adjacent SOFC.

A stack (1) of intermediate temperature, metal-supported, solid oxide fuel cell units (10), each unit comprising a metal support substrate (12), a spacer (22) and an interconnect (30) that each have compression bolt holes (34), fuel inlet port (33), fuel outlet port (32) and air outlet (17) therein, wherein bolt voids (34) are formed by aligning the bolt holes and a further void (17) by aligning the air outlets, and the voids are vented, for example, to the environment or further void to prevent the build-up of fuel, moisture or ions.

A frame gasket may include a flat base, which is positioned along the edge of stack constitutional parts and which includes a first elastic base and reinforced fibers mixed therein to ensure sealing of a fuel cell stack, and first projection units, which project over the base and which include a second elastic base.

A frame gasket may include a flat base, which is positioned along the edge of stack constitutional parts and which includes a first elastic base and reinforced fibers mixed therein to ensure sealing of a fuel cell stack, and first projection units, which project over the base and which include a second elastic base.

A power transmission system enables the electrical contacting of a stack with a power line or with an adjacent stack. The stack is made up of a plurality of planar electrochemical modules and is closed off at each of the end faces by a stack-side power transmission plate. The power line to be contacted ends with a line-side power transmission plate. The power transmission system comprises at least one porous, metallic body which is arranged between the stack-side power transmission plate of the stack to be contacted and the line-side power transmission plate of the power line or the stack-side power transmission plate of the adjacent stack and is electrically connected to these power transmission plates. In addition, the porous, metallic body is sealed in a gastight manner by a closed circumferential seal.