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US 5,702,836 AGranted
Electrocatalyst
AssigneeUniversity of Massachusetts
InventorsChaoying Ma, Albert D. Kowalak
Life of this patent
Estimating the term…
Abstract
A Pt/Fe/C electrocatalyst for, e.g., the oxidation of methanol in fuel cells, Pt/Fe colloidal particles and a method for preparing the Pt/Fe/C electrocatalyst are described.
Claims23
A method for preparing an electrocatalyst, said method comprising
- adding iron oxide to a first solution comprising platinum to produce a second solution comprising iron oxide and platinum;
- and
- adding an oxidizing agent to the second solution and mixing the second solution under conditions and for a time sufficient to produce particles, each particle comprising an inner core of iron oxide and an outer shell of platinum oxide.
A method for preparing an electrocatalyst, said method comprising
- reducing a starting solution comprising H.sub.2 PtCl.sub.6 to produce a first solution, wherein the first solution comprises platinum in the form of H.sub.3 Pt(SO.sub.3).sub.2 OH;
- adding iron oxide to the first solution to produce a second solution comprising iron oxide and platinum;
- adding an oxidizing agent to the second solution and mixing the second solution under conditions and for a time sufficient to produce particles, each particle comprising an inner core of iron oxide and an outer shell of platinum oxide;
- adding carbon black particles to the second solution to create a paste comprising Pt/Fe/C particles and chloride compounds;
- aggregating in the paste a supernatant comprising the Pt/Fe/C particles;
- removing the supernatant from the paste;
- dispersing the supernatant into a third solution;
- testing the third solution for chloride;
- and
- repeating aggregation, removal, dispersion, and testing of the supernatant until the testing shows a lack of chloride in the supernatant of Pt/Fe/C particles.
7 more elements
An electrocatalyst comprising a plurality of bimetallic colloidal particles, each particle comprising an inner core of iron oxide and an outer shell of platinum oxide.
Dependencies are inferred from the claim text.