Redox mitigating solid oxide cell compositions

A solid oxide cell comprising:

• a porous solid cathode layer including a first cathode surface and a second cathode surface;
• a solid electrolyte layer comprising a first electrolyte surface and a second electrolyte surface, with the first electrolyte surface disposed toward the second cathode surface;
• a porous cermet anode functional layer (AFL) comprising a first AFL surface and a second AFL surface, the first AFL surface contacting the second electrolyte surface;
• a porous cermet anode substrate (AS) comprising a first AS surface and a second AS surface, the first AS surface contacting the second AFL surface;
• and
• a porous cermet oxidation barrier layer (OBL) comprising a first OBL surface and a second OBL surface, the first OBL surface contacting the second AS surface;
• wherein the porous solid cathode layer has a porosity when oxidized in a range of about 5% to about 50%;
• wherein the AFL comprises yttria-stabilized zirconia and about 35 vol. % to about 70 vol. % of transition metals provided that the AFL does not comprise both cobalt and iron;
• wherein the AFL has a porosity when reduced in a range of about 10% to about 50%;
• wherein the AS has a porosity when reduced in a range of about 25% to about 60%;
• wherein the OBL comprises yttria-stabilized zirconia and about 35 vol. % to about 70 vol. % of transition metals including (i) nickel, and (ii) at least one of cobalt or iron;
• wherein the thickness of the OBL is in a range of about 1 μm to about 30 μm;
• wherein, in the OBL, a ratio of (i) said nickel to (ii) said at least one of cobalt or iron is in a range of about 1:5 to about 10:1;
• and
• wherein the OBL has a porosity when reduced in a range of about 5% to about 50%.