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US 8,912,114 B2Granted
Platinum alloy electrocatalyst with enhanced resistance to anion poisoning for low and medium temperature fuel cells
AssigneeNortheastern University
InventorSanjeev Mukerjee
Life of this patent
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Abstract
A platinum alloy catalyst is made by a microemulsion method. The resulting catalyst has superior properties for use in low and medium temperature fuel cells.
Claims17
A method of making a nanoparticulate platinum alloy catalyst, the method comprising the steps of:
- (a) providing a salt or complex of platinum and a salt or complex of a transition metal in an aqueous solution;
- (b) injecting an aliquot of the aqueous solution into a nonpolar solvent to form an emulsion;
- (c) adding a reducing agent to the emulsion, whereby the platinum and transition metal become reduced and form a colloidal sol comprising nanoparticles of platinum alloy;
- (d) adding a surfactant to the colloidal sol after step (c);
- whereby the surfactant encapsulates the nanoparticles;
- (e) adding particulate carbon to the colloidal sol after step (d);
- and
- (f) adding a polar solvent miscible with the nonpolar solvent, whereby the platinum alloy nanoparticles adhere to the carbon particles to form a nanoparticulate platinum alloy catalyst.
5 more elements
Dependencies are inferred from the claim text.