Catalyst
A platinum alloy catalyst PtXY, wherein X is a transition metal (other than platinum, palladium or iridium) and Y is a transition metal (other than platinum, palladium or iridium) which is less leachable than X in an acidic environment, has an atomic percentage in the alloy of platinum is from 20.5-40at %, of X is from 40.5-78.5at % X and of Y is from 1-19.5at %.
1. A catalyst material, comprising a platinum alloy XPtY, wherein X is nickel, cobalt, chromium, copper, titanium or manganese and Y is tantalum or niobium,
and wherein in the alloy the atomic percentage of platinum is from 20.5-30 at %, of X is from 40.5-78.5 at %, and of Y is from 1-19.5 at %,
and wherein the catalyst material is supported on a conductive support material and configured for use in an electrochemical cell.
2. The catalyst material according to claim 1 , wherein in the alloy the atomic percentage of platinum is from 24-30 at %.
3. The catalyst material according to claim 1 , wherein in the alloy the atomic percentage of platinum is from 24-30 at %, of X is from 55-72 at % X, and Y is from 3-16 at %.
4. The catalyst material according to claim 1 , wherein the platinum alloy is CoPtTa.
5. The catalyst material according to claim 1 , wherein the material consists essentially of the platinum alloy XPtY, wherein X is cobalt, chromium, copper, titanium or manganese, and the atomic percentage of platinum is from 24-30 at %, of X is from 55-72 at % X, and of Y is from 3-16 at %.
6. An electrode comprising the catalyst material according to claim 1 .
7. The electrode according to claim 6 , wherein the electrode is a cathode.
8. A decal transfer substrate comprising the catalyst material according to claim 1 .
9. A catalyst coated membrane comprising the catalyst material according to claim 1 .
10. A phosphoric acid fuel cell comprising the catalyst material according to claim 1 .
11. A proton exchange membrane fuel cell comprising the catalyst material according to claim 1 .