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US 8,802,316 B1Granted
Solid oxide fuel cells having porous cathodes infiltrated with oxygen-reducing catalysts
AssigneeU.S. Department of Energy
InventorsMeilin Liu, Ze Liu, Mingfei Liu, Lifang Nie, David Spencer Mebane, Lane Curtis Wilson, Wayne Surdoval
Life of this patent
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Abstract
Solid-oxide fuel cells include an electrolyte and an anode electrically coupled to a first surface of the electrolyte. A cathode is provided, which is electrically coupled to a second surface of the electrolyte. The cathode includes a porous backbone having a porosity in a range from about 20% to about 70%. The porous backbone contains a mixed ionic-electronic conductor (MIEC) of a first material infiltrated with an oxygen-reducing catalyst of a second material different from the first material.
Claims9
A solid-oxide fuel cell, comprising:
- an electrolyte;
- an anode electrically coupled to a first surface of the electrolyte;
- and
- a cathode electrically coupled to a second surface of the electrolyte, the cathode comprising a porous mixed ionic-electronic conductor (MIEC) having a porosity in a range from about 20% to about 70% and comprising a plurality of pores, and the cathode further comprising an oxygen-reducing catalyst coating, where the oxygen-reducing catalyst coating comprises an oxygen-reducing catalyst where,
- the porous mixed ionic-electronic conductor comprises a perovskite having a composition La1-xAxB1-yB′y where A comprises a strontium (Sr) element at the A-site of the perovskite, B comprises a cobalt (Co) element at the B-site of the perovskite, and B′ comprises an iron (Fe) element at the B-site of the perovskite, and where 0≦x<1 and 0≦y<1 and where,
- the oxygen-reducing catalyst is selected from a group consisting of lanthanum strontium manganite (LSM), strontium-doped samarium cobaltite (SSC), calcium-doped lanthanum cerate (LCC), calcium-doped lanthanum zirconate (LCZ), gadolinium-doped ceria (ODC) and samaria-doped ceria (SDC) and where,
- the oxygen-reducing catalyst coating has a thickness in a range from about one monolayer to about 30 nm and where,
- some portion of the plurality of pores in the porous mixed ionic-electronic conductor (MIEC) have a pore surface where the oxygen-reducing catalyst coating is directly on the pore surface.
5 more elements
A solid-oxide fuel cell, comprising:
- an electrolyte;
- an anode electrically coupled to a first surface of the electrolyte;
- and
- a cathode electrically coupled to a second surface of the electrolyte, the cathode comprising a porous mixed ionic-electronic conductor (MIEC) having a porosity in a range from about 20% to about 70% and comprising a plurality of pores, where the plurality of pores has an average pore size greater than about 0.3 μm, and the cathode further comprising an oxygen-reducing catalyst coating, where the oxygen-reducing catalyst coating comprises an oxygen-reducing catalyst where,
- the porous mixed ionic-electronic conductor comprises a perovskite having a composition La1-xAxB1-yB′y, where A comprises a strontium (Sr) element at the A-site of the perovskite, B comprises a cobalt (Co) element at the B-site of the perovskite, and B′ comprises an iron (Fe) element at the B-site of the perovskite, and where 0≦x<1 and 0≦y<1 and where,
- the oxygen-reducing catalyst is selected from a group consisting of lanthanum strontium manganite (LSM), strontium-doped samarium cobaltite (SSC), calcium-doped lanthanum cerate (LCC), calcium-doped lanthanum zirconate (LCZ), gandolinium-doped ceria (GDC) and samaria-doped ceria (SDC) and where,
- the oxygen-reducing catalyst coating has a thickness in a range from about one monolayer to about 30 nm and where,
- some portion of the plurality of pores in the porous mixed ionic-electronic conductor (MIEC) have a pore surface where the oxygen-reducing catalyst coating is directly on the pore surface.
5 more elements
Dependencies are inferred from the claim text.