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

Abstract

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.

Inventors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1178016
Patent Number(s):
9,005,331
Application Number:
12/708,226
Assignee:
Brookhaven Science Associates, LLC (Upton, NY) BNL
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Patent
Resource Relation:
Patent File Date: 2010 Feb 18
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Adzic, Radoslav, Zhang, Junliang, Mo, Yibo, and Vukmirovic, Miomir. Platinum-coated non-noble metal-noble metal core-shell electrocatalysts. United States: N. p., 2015. Web.
Adzic, Radoslav, Zhang, Junliang, Mo, Yibo, & Vukmirovic, Miomir. Platinum-coated non-noble metal-noble metal core-shell electrocatalysts. United States.
Adzic, Radoslav, Zhang, Junliang, Mo, Yibo, and Vukmirovic, Miomir. Tue . "Platinum-coated non-noble metal-noble metal core-shell electrocatalysts". United States. doi:. https://www.osti.gov/servlets/purl/1178016.
@article{osti_1178016,
title = {Platinum-coated non-noble metal-noble metal core-shell electrocatalysts},
author = {Adzic, Radoslav and Zhang, Junliang and Mo, Yibo and Vukmirovic, Miomir},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 14 00:00:00 EDT 2015},
month = {Tue Apr 14 00:00:00 EDT 2015}
}

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