Cross-flow interconnect and fuel cell system including same

A fuel cell stack, comprising:

• interconnects stacked over one another;
• fuel cells disposed between the interconnects, facing fuel and air flow fields of adjacent interconnects;
• a fuel inlet riser at least partially defined by the inlets of the interconnects and configured to provide fuel to the fuel flow fields;
• a fuel outlet riser at least partially defined by fuel outlets of the interconnects and configured to receive anode exhaust from the fuel flow fields;
• riser seals disposed on a riser seal region of each interconnect and configured to prevent fuel in the fuel inlet and outlet risers from entering the air flow fields;
• and
• perimeter seals disposed on a perimeter seal region of each interconnect and configured to prevent air from entering the fuel flow fields;
• wherein the riser and perimeter seals are formed of a seal material comprising, by weight:
• SiO2 in an amount ranging from about 30% to about 60%;
• B2O3 in an amount ranging from about 0.5% to about 15%.
• Al2O3 in an amount ranging from about 0.5% to about 5%;
• CaO in an amount ranging from about 5% to about 30%;
• MgO in an amount ranging from about 2% to about 25%;
• La2O3 in an amount ranging from about 2% to about 12%;
• and
• at least 0.5% of at least one of BaO and SrO.

The fuel cell stack of claim 19, wherein the seal material comprises, by weight:

• BaO in an amount ranging from about 20% to about 30%;
• SrO in an amount ranging from about 10% to about 20%;
• or
• BaO in an amount ranging from about 20% to about 30% and SrO in an amount ranging from about 10% to about 20%.