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Hydrogen Absorption Induced Metal Deposition on Palladium and Palladium-Alloy Particles

Brookhaven National Laboratory

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<p>
	High resolution electron micrograph of a palladium nanoparticle coated with a monolayer of platinum</p>

High resolution electron micrograph of a palladium nanoparticle coated with a monolayer of platinum

Technology Marketing Summary

Platinum is an excellent catalyst for many reactions. However, it is also very expensive. The catalytic activity per gram of platinum can be increased by using a particle composite consisting of an atomically thin layer of the metal on a palladium alloy particle. When used as an electrocatalyst for the oxygen reduction reaction, this structure exhibits up to twenty times the platinum mass catalytic activity of commercially available platinum/carbon electrocatalysts. These structures can be used in fuel cells and other electrocatalytic or heterogeneous catalytic applications.

Description

A particle composite is made by first exposing a particle of palladium or a palladium alloy to hydrogen, which is absorbed by the metal. The hydrogen-absorbed core is then coated with an atomically thin layer of platinum. The layer may be a sub-monolayer up to about three monolayers thick. The palladium alloy may be homogeneous or heterogeneous. The mass catalytic activity for platinum in these composites for electrocatalysis of the oxygen reduction reaction is about 0.57 A/mg at 0.9 V. Stability in a fuel cell environment has been demonstrated for more than 3,000 hours. After 100,000 cycles the reactivity is reduced by only about 37%.

Benefits

The platinum/palladium alloy particle composite offers high catalytic activity at lower cost than bulk platinum/carbon catalysts.

Applications and Industries

Fuel cell catalysts; replacement for platinum/carbon catalysts and electrocatalysts; heterogeneous catalysis.

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 7,507,495
Patent
7,507,495
Hydrogen absorption induced metal deposition on palladium and palladium-alloy particles
The present invention relates to methods for producing metal-coated palladium or palladium-alloy particles. The method includes contacting hydrogen-absorbed palladium or palladium-alloy particles with one or more metal salts to produce a sub-monoatomic or monoatomic metal- or metal-alloy coating on the surface of the hydrogen-absorbed palladium or palladium-alloy particles. The invention also relates to methods for producing catalysts and methods for producing electrical energy using the metal-coated palladium or palladium-alloy particles of the present invention.
Brookhaven National Laboratory 03/24/2009
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
04-28PrototypeAvailable04/01/201104/01/2011

Contact BNL About This Technology

To: Poornima Upadhya<pupadhya@bnl.gov>