Triple core-shell catalyst complex for electrochemical device and method of manufacturing same
AssigneesHyundai Motor Company, Kia Corporation
InventorsJunu Bak, Jun Seog Park
Life of this patent
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Abstract
A triple core-shell catalyst complex for electrochemical devices features a core of Pt and a first heterometal (M1), a first shell containing Pt and a second heterometal (M2), and a second shell containing Pt. Method of making the catalyst involves forming the first shell by simultaneously reducing Pt and M2, then removing M2 at the outer surface to form a Pt-rich second shell, optionally followed by acid and heat treatments for stability.
Claims20
A triple core-shell catalyst complex for an electrochemical device, comprising a triple core-shell catalyst comprising:
- a core comprising an alloy catalyst (Pt-M1) of platinum (Pt) and a first heterometal (M1);
- a first shell covering at least a portion of a surface of the core and comprising platinum (Pt) and a second heterometal (M2);
- and
- a second shell covering at least a portion of a surface of the first shell and comprising platinum (Pt).
A catalyst comprising:
- a core comprising an alloy catalyst (Pt-M1) of platinum (Pt) and a first heterometal (M1);
- an inner shell disposed on at least a portion of a surface of the core and comprising platinum (Pt) and a second heterometal (M2);
- and
- a Pt outer shell disposed on at least a portion of a surface of the inner shell.
- wherein the first heterometal (M1) comprises any one selected from the group consisting of chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), gallium (Ga), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), ruthenium (Ru), indium (In), tin (Sn), tungsten (W), iridium (Ir), gold (Au), bismuth (Bi), and combinations thereof, and
- wherein the second heterometal (M2) comprises any one selected from the group consisting of chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), gallium (Ga), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), ruthenium (Ru), indium (In), tin (Sn), tungsten (W), iridium (Ir), gold (Au), bismuth (Bi), and combinations thereof.
A method of manufacturing a triple core-shell catalyst complex for an electrochemical device, the method comprising:
- preparing a first mixture by adding an alloy catalyst (Pt-M1) of platinum (Pt) and a first heterometal (M1) to a reducing solvent;
- preparing a second mixture by adding a platinum precursor and a second heterometal (M2) precursor to the first mixture;
- forming a first shell by simultaneously reducing platinum (Pt) and a second heterometal (M2) on at least a portion of a surface of the alloy catalyst (Pt-M1) by heating the second mixture;
- and
- forming a second shell by removing the second heterometal (M2) from an outermost surface of the first shell by adding an intermediate catalyst comprising the alloy catalyst (Pt-M1) and the first shell to an acid solution followed by acid treatment.
Dependencies are inferred from the claim text.