Platinum-coated non-noble metal-noble metal core-shell electrocatalysts

Adzic, Radoslav; Zhang, Junliang; Mo, Yibo; Vukmirovic, Miomir

Title: Platinum-coated non-noble metal-noble metal core-shell electrocatalysts

Patent · Tue Apr 14 00:00:00 EDT 2015

OSTI ID:1178016

Adzic, Radoslav; Zhang, Junliang; Mo, Yibo; Vukmirovic, Miomir

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC02-98CH10886

Assignee:: Brookhaven Science Associates, LLC (Upton, NY)

Patent Number(s):: 9,005,331

Application Number:: 12/708,226

OSTI ID:: 1178016

Resource Relation:: Patent File Date: 2010 Feb 18

Country of Publication:: United States

Language:: English

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