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:
- Issue Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1178016
- Patent Number(s):
- 9005331
- Application Number:
- 12/708,226
- Assignee:
- Brookhaven Science Associates, LLC (Upton, NY)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
B - PERFORMING OPERATIONS B82 - NANOTECHNOLOGY B82Y - SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES
- 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. 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 = {2015},
month = {4}
}
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