Regeneration of fuel cell electrodes
AssigneeLG Fuel Cell Systems Inc.
InventorsZhien Liu, Joe Deering
Life of this patent
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Abstract
A method of operating a fuel cell system is provided. The fuel cell system may comprise one or more solid oxide fuel cells. One or more of the fuel cells may be operated in a fuel cell mode under an average current density of 100 to 1000 mA/cm2 for a period of at least five hundred hours. The method may further comprise operating at least one of the fuel cells in an electrolyzer mode under an average current density from 100 to 1500 mA/cm2, which may be applied for at least one hour. The ratio of the average current density in the electrolyzer mode to the average current density in the fuel cell mode may be at least one but no more than two and one-half.
Claims20
A method of operating a solid oxide fuel cell system comprising one or more fuel cells, said method comprising:
- operating one or more of the fuel cells in a fuel cell mode under an average current density from 100 to 1000 mA/cm2 for a period of at least five hundred hours;
- and
- operating at least one of the fuel cells in an electrolyzer mode under an average current density from 100 to 1500 mA/cm2.
A method of operating a solid oxide fuel cell comprising:
- operating one or more fuel cells in a fuel cell mode under a current density from 100 to 1000 mA/cm2 for a period of at least one thousand hours;
- and
- operating at least one of the fuel cells in an electrolyzer mode under an average current density from 600 to 800 mA/cm2 for a period of at least one hour.
A method of operating a fuel cell system comprising:
- operating one or more fuel cells of said fuel cell system in a fuel cell mode at a first average current density;
- and
- operating at least one of said fuel cells in an electrolyzer mode at a second average current density,
- wherein the ratio of the second average current density to the first average current density is at least one but no more than two and one-half.
Dependencies are inferred from the claim text.