Anode catalyst materials for use in fuel cells
AssigneeThe Technical University of Denmark (DTU)
InventorsJens Kehlet Nørskov, Ping Liu
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Abstract
Catalyst materials having a surface comprising a composition Mx/Pty/Sub; wherein M is selected from the group of elements Fe, Co, Rh and Ir; or wherein M represents two different elements selected from the group comprising Fe, Co, Rh, Ir, Ni, Pd, Cu, Ag, Au and Sn; and wherein Sub represents a substrate material selected from Ru and Os; the respective components being present within specific ranges, display improved properties for use in anodes for low-temperature fuel cell anodes for PEMFC fuel cells and direct methanol fuel cells.
Claims19
A CO tolerant low temperature fuel cell anode catalyst material having a surface, comprising:
- a composition Mx/Pty/Sub;
- wherein M is selected from the group consisting of elements Fe, Co, Rh and Ir;
- or
- M represents M1m+M2n;
- M1 and M2 are different from each other, and are selected from the group of elements consisting of Fe, Co, Rh, Ir, Ni, Pd, Cu, Ag, Au and Sn;
- Sub represents a substrate metal selected from the group consisting of Ru and Os;
- wherein said substrate metal may be present at the surface of an anode material in an amount of less than 25%;
- and wherein said substrate metal is alloyed in the bulk with the metal M and Pt;
- x is a number in the range of 0.7 to 1.3;
- y is a number in the range of 0.7 to 2.3;
- m and n are each a number in the range of 0.7 to 2.3;
- and
- x, y, m and n signify the relative occurrence of the different elements at the surface, not including the substrate metal.
A CO tolerant low temperature fuel cell anode catalyst material having a surface, comprising:
- a composition Mx/Pty/Sub;
- wherein M is selected from the group consisting of elements Fe, Co, Rh and Ir;
- or
- M represents M1m+M2n;
- M1 and M2 are different from each other, and are selected from the group of elements consisting of Fe, Co, Rh, Ir, Ni, Pd, Cu, Ag, Au and Sn;
- Sub represents a substrate metal selected from the group consisting of Ru and Os which is present as an alloying metal in the surface anode material in an amount of less than 25% along with alloying metals M and Pt;
- x is a number in the range of 0.7 to 1.3;
- y is a number in the range of 0.7 to 2.3;
- m and n are each a number in the range of 0.7 to 2.3;
- and
- x, y, m and n signify the relative occurrence of the different elements at the surface, not including the substrate metal.
An anode for a fuel cell, comprising:
- a Ru or Os metal substrate having a surface modified as a CO tolerant, low temperature fuel cell anode surface alloy catalyst in which the Ru or Os (Sub) metal forms an alloy composition with Pt and modifying element M and has the formula:
- Mx/Pty/Sub
- wherein M is selected from the group consisting of elements Fe, Co, Rh and Ir;
- or
- M represents M1m+M2n;
- wherein M1 and M2 are different from each other, and are selected from the group of elements consisting of Fe, Co, Rh, Ir, Ni, Pd, Cu, Ag, Au and Sn;
- the Sub metal is present in the surface alloy catalyst in an amount of less than 25%;
- x is a number in the range of 0.7 to 1.3;
- y is a number in the range of 0.7 to 2.3;
- m and n are each a number in the range of 0.7 to 2.3;
- and
- x, y, m and n signify the relative occurrence of the different elements at the surface, not including the substrate metal.
Dependencies are inferred from the claim text.