Complex cobalt oxide catalysts for oxygen reduction electrodes in alkaline fuel cells
AssigneeHorizon Fuel Cells, LLC
InventorsEvgeny V. Antipov, Galina A. Tsirlina, Sergey Y. Istomin, Oleg A. Drozhzhin, Eduard E. Levin
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Abstract
Oxygen is reduced in the presence of a catalyst at the cathode of an alkaline-electrolyte fuel cell. Catalysts of the formula Sr3−xA1+xCo4−yByO10.5−z wherein −0.6≦x≦1.0; 0≦y≦3; and −1.5≦z≦0.5; wherein A represents Eu, Gd, Tb, Dy, Ho, or Y; and wherein B represents Fe, Ga, Cu, Ni, Mn, and Cr, demonstrate high catalytic activity and high chemical stability when used as the oxygen-reduction catalyst in alkaline fuel cells.
Claims22
An oxygen reduction catalyst comprising a compound represented by Formula 1-1:
- Sr3−xA1+xCo4−yByO10.5−z (1-1)
- wherein −0.6≦x≦1.0;
- 0≦y≦3;
- and −1.5≦z≦0.5;
- wherein A represents an element of the group consisting of Eu, Gd, Tb, Dy, Ho, and Y;
- wherein B represents an element of the group consisting of Fe, Ga, Cu, Ni, Mn, and Cr;
- and
- wherein said compound further comprises a crystal structure comprising a plurality of layers of corner-shared octahedra, wherein each of said layers is separated by an oxygen-deficient layer, wherein said oxygen-deficient layers comprise tetra cyclic units of corner-shared tetrahedra CoO4 with an additional oxygen atom.
A fuel cell comprising an oxygen reduction catalyst comprising a compound represented by Formula 1-1:
- Sr3−xA1+xCo4−yByO10.5−z (1-1)
- wherein −0.6≦x≦1.0;
- 0≦y≦3;
- and −1.5≦z≦0.5;
- wherein A represents an element of the group consisting of Eu, Gd, Tb, Dy, Ho, and Y;
- wherein B represents an element of the group consisting of Fe, Ga, Cu, Ni, Mn, and Cr;
- and
- wherein said compound further comprises a crystal structure comprising a plurality of layers of corner-shared octahedra, wherein each of said layers is separated by an oxygen-deficient layer, wherein said oxygen-deficient layers comprise tetra cyclic units of corner-shared tetrahedra CoO4 with an additional oxygen atom.
Dependencies are inferred from the claim text.