Skip to Content
Return to Search

Platinum-Coated Non-Noble Metal-Noble Metal Core-Shell Electrocatalysts

United States Patent Application

*** PATENT GRANTED ***
20100197490
9,005,331
A1
View the Complete Application at the US Patent & Trademark Office
Brookhaven National Laboratory - Visit the Office of Technology Commercialization and Partnerships Website
Core-shell particles encapsulated by a thin film of a catalytically active metal are described. The particles are preferably nanoparticles comprising a non-noble core with a noble metal shell which preferably do not include Pt. The non-noble metal-noble metal core-shell nanoparticles are encapsulated by a catalytically active metal which is preferably Pt. The core-shell nanoparticles are preferably formed by prolonged elevated-temperature annealing of nanoparticle alloys in an inert environment. This causes the noble metal component to surface segregate and form an atomically thin shell. The Pt overlayer is formed by a process involving the underpotential deposition of a monolayer of a non-noble metal followed by immersion in a solution comprising a Pt salt. A thin Pt layer forms via the galvanic displacement of non-noble surface atoms by more noble Pt atoms in the salt. The overall process is a robust and cost-efficient method for forming Pt-coated non-noble metal-noble metal core-shell nanoparticles.
Adzic, Radoslav (East Setauket, NY), Zhang, Junliang (Rochester, NY), Mo, Yibo (Naperville, IL), Vukmirovic, Miomir (Port Jefferson Station, NY)
Brookhaven Science Associates, LLC (Upton NY)
12/ 708,226
February 18, 2010
[0002] This invention was made with Government support under contract number. DE-AC02-98CH10886, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.