Solid oxide fuel cell interconnect having a magnesium containing corrosion barrier layer and method of making thereof
AssigneeBloom Energy Corporation
InventorsEmad El Batawi, Sanchit Khurana, Michael Gasda, Tad Armstrong
Life of this patent
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Abstract
An interconnect for a fuel cell stack includes an interconnect body having an air surface having air flow channels and ribs and a fuel surface having fuel flow channels and ribs, an electrically conductive contact layer located on the air surface of the interconnect, the electrically conductive contact layer containing at least one of Co and Mn, and a corrosion barrier layer containing zirconium silicate and magnesium aluminosilicate crystals located over the electrically conductive contact layer.
Claims8
An interconnect for a fuel cell stack, comprising:
- an interconnect body having an air surface having air flow channels and ribs and a fuel surface having fuel flow channels and ribs;
- an electrically conductive contact layer located on the air surface of the interconnect, the electrically conductive contact layer containing at least one of Co and Mn;
- and
- a corrosion barrier layer containing zirconium silicate and magnesium aluminosilicate crystals located over the electrically conductive contact layer;
- wherein the corrosion barrier layer comprises a glass ceramic barrier layer comprising a glassy matrix containing the zirconium silicate and the magnesium aluminosilicate crystals;
- and
- wherein the glass ceramic barrier layer is formed from a precursor layer that comprises, on an oxide basis:
- from about 45 to about 60 wt. % SiO2;
- from about 10 to about 20 wt. % of MgO
- from about 10 to about 20 wt. % CaO;
- from about 0 to about 10 wt. % K2O;
- from about 5 to about 30 wt. % of at least one of La2O3 and ZrO2;
- from about 2 to about 25 wt. % Al2O3;
- from about 0 to about 5 wt. % BaO;
- and
- from about 0 to about 3 wt. % B2O3.
An interconnect for a fuel cell stack, comprising:
- an interconnect body having an air surface having air flow channels and ribs and a fuel surface having fuel flow channels and ribs;
- an electrically conductive contact layer located on the air surface of the interconnect, the electrically conductive contact layer containing at least one of Co and Mn;
- and
- a corrosion barrier layer containing zirconium silicate and magnesium aluminosilicate crystals located over the electrically conductive contact layer;
- wherein the corrosion barrier layer comprises a glass ceramic barrier layer comprising a glassy matrix containing the zirconium silicate and the magnesium aluminosilicate crystals;
- and
- wherein an atomic formula of the magnesium aluminosilicate crystals is ((BaO)1-x(MgO)x)(Al2O3)(SiO2)2, where 0≤x≤0.5.
An interconnect for a fuel cell stack, comprising:
- an interconnect body having an air surface having air flow channels and ribs and a fuel surface having fuel flow channels and ribs;
- an electrically conductive contact layer located on the air surface of the interconnect, the electrically conductive contact layer containing at least one of Co and Mn;
- and
- a corrosion barrier layer containing zirconium silicate and magnesium aluminosilicate crystals located over the electrically conductive contact layer;
- wherein the corrosion barrier layer comprises a glass ceramic barrier layer comprising a glassy matrix containing the zirconium silicate and the magnesium aluminosilicate crystals;
- and
- wherein the magnesium aluminosilicate crystals comprise barium magnesium aluminosilicate crystals having an atomic formula ((BaO)1-x(MgO)x)(Al2O3)(SiO2)2, where 0.2≤x≤0.5.
Dependencies are inferred from the claim text.