Metastable ceramic fuel cell and method of making the same
First Claim
1. A solid oxide fuel cell having anode, cathode and electrolyte layers each formed essentially of a multi-oxide ceramic material, said electrolyte layer being a uniform deposit formed by thermal quenching at a rate of about 106 degrees Kelvin per second to about 108 degrees Kelvin per second and having a structure selected from the group consisting of nanocrystalline, nanocomposite and amorphous, each of said structures being a far-from-equilibrium metastable structure, said electrolyte layer having a matrix of multi-oxide ceramic material comprising an 8-12 mole % yttria-stabilized zirconia, said electrolyte layer serving as a fast oxygen ion conductor.
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Abstract
A solid oxide fuel cell has anode, cathode and electrolyte layers each formed essentially of a multi-oxide ceramic material and having a far-from-equilibrium, metastable structure selected from the group consisting of nanocrystalline, nanocomposite and amorphous. The electrolyte layer has a matrix of the ceramic material, and is impervious and serves as a fast oxygen ion conductor. The electrolyte layer has a matrix of the ceramic material and a dopant dispersed therein in an amount substantially greater than its equilibrium solubility in the ceramic matrix. The anode layer includes a continuous surface area metallic phase in which electron conduction is provided by the metallic phase and the multi-oxide ceramic matrix provides ionic conduction.
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Citations
12 Claims
- 1. A solid oxide fuel cell having anode, cathode and electrolyte layers each formed essentially of a multi-oxide ceramic material, said electrolyte layer being a uniform deposit formed by thermal quenching at a rate of about 106 degrees Kelvin per second to about 108 degrees Kelvin per second and having a structure selected from the group consisting of nanocrystalline, nanocomposite and amorphous, each of said structures being a far-from-equilibrium metastable structure, said electrolyte layer having a matrix of multi-oxide ceramic material comprising an 8-12 mole % yttria-stabilized zirconia, said electrolyte layer serving as a fast oxygen ion conductor.
Specification