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US 12,731,795 B2Granted
Fuel cell interconnect alloyed with transition metal element and method of making thereof
AssigneeBloom Energy Corporation
InventorsVijay Radhakrishnan, Tad Armstrong, Mosur K. Premkumar
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Abstract
A method of making an interconnect for a fuel cell stack includes compressing an interconnect powder to form an interconnect, the interconnect power containing Cr, Fe and at least one transition metal selected from Co, Cu, Mn, Ni, or V pre-alloyed with at least one of the Cr and the Fe, and sintering the interconnect.
Claims18
An interconnect for a fuel cell stack, comprising:
- an interconnect body comprising a chromium based alloy containing iron and at least one transition metal selected from Co, Cu, Mn, Ni, or V, the interconnect body comprising fuel flow channels separated by fuel ribs on a fuel side and air flow channels separated by air ribs on an air side;
- a protective coating comprising an oxide of at least one of Mn or Co located over the air side of the interconnect body;
- and
- a chromium-transition metal oxide spinel interfacial layer located between the air side of the interconnect body and the protective coating,
- wherein a concentration of the at least one transition metal selected from Co, Cu, Mn, Ni, or V is higher on the air side of the interconnect body than on the fuel side of the interconnect body.
2 more elements
Dependencies are inferred from the claim text.