Surface modified SOFC cathode particles and methods of making same
AssigneeSonata Scientific LLC
InventorsJeffrey F. Roeder, Anthony F. Zeberoff, Peter C. Van Buskirk
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Abstract
A novel method to modify the surface of lanthanum and strontium containing cathode powders before or after sintering by depositing layers of gadolinium doped ceria (GDC) and/or samarium doped ceria or similar materials via atomic layer deposition on the powders. The surface modified powders are sintered into porous cathodes that have utility enhancing the electrochemical performance of the cathodes, particularly for use in solid oxide fuel cells. Similar enhancements are observed for surface treatment of sintered cathodes.
Claims19
A solid surface modified porous cathode;
- the solid surface modified porous cathode comprising sintered surface modified oxide powder particles;
- the sintered oxide powder particles having an oxide surface layer comprising a metal oxide, wherein the metal is a rare earth element, and wherein a symmetrical electrochemical cell fabricated with the solid surface modified porous cathode has between 32% and 56% lower polarization in ohm cm-squared than a solid unmodified porous cathode comprised of the same oxide powder particles sintered without the oxide surface layer.
A solid surface modified porous cathode;
- the solid surface modified porous cathode comprising sintered surface modified oxide powder particles;
- the sintered surface modified oxide powder particles having their surface modified by having a deposited metal oxide surface layer before sintering, wherein further the metal oxide surface layer forms an interconnecting web between the sintered surface modified oxide powder particles.
Dependencies are inferred from the claim text.