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Simple, Ethanol-Driven Synthesis of Core-Shell Nanoparticles

Brookhaven National Laboratory

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Technology Marketing Summary

Well-defined core-shell nanoparticles offer high-surface-area catalysts with tunable surface properties. Challenges lie in synthesis and characterization of atomically-ordered core-shell interfaces, which are important for enhancing both activity and stability. This "green" synthesis method uses ethanol - a simple solvent for metal precursors "as the reductant to produce highly ordered ruthenium-platinum core-shell nanocatalysts with a tunable number of platinum layers.

Description

The noble-metal nanoparticles may be made using ethanol as the solvent and reductant for fabrication with narrow particle size distributions, and also to coat a thin metal shell on other metal cores. With or without carbon supports, particle size is controlled by fine-tuning the reducing power of ethanol, by adjusting the temperature, and by adding an alkaline solution during synthesis. The thickness of the added or coated metal shell can be varied easily from sub-monolayer to multiple layers in a seed-mediated growth process. The entire synthesis of designed core-shell catalysts can be completed using metal salts as the precursors with more than 98% yield, and substantially no cleaning processes are necessary apart from simple rinsing. Accordingly, this is considered a "green" chemistry method.

Benefits

Pd and Ru weigh about half as much as Pt and are several-fold less expensive. Developing economically viable synthesis methods to produce well-defined Pd@Pt and Ru@Pt core-shell nanoparticles holds promise for meeting the performance/cost targets for commercializing PEM fuel cells, and for reducing the cost of PEM water electrolyzers.

Applications and Industries

Highly ordered Ru@Pt core-shell nanocatalysts with a tunable number of Pt atomic layers can be used as a substitute for conventional Pt electrocatalysts in the oxygen reduction reaction in fuel cells and for both the hydrogen oxidation reaction and the hydrogen evolution reaction in water electrolyzers.

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Application 20130264198
Application
20130264198
Synthesis of Nanoparticles Using Ethanol
The present disclosure relates to methods for producing nanoparticles. The nanoparticles may be made using ethanol as the solvent and the reductant to fabricate noble-metal nanoparticles with a narrow particle size distributions, and to coat a thin metal shell on other metal cores. With or without carbon supports, particle size is controlled by fine-tuning the reduction power of ethanol, by adjusting the temperature, and by adding an alkaline solution during syntheses. The thickness of the added or coated metal shell can be varied easily from sub-monolayer to multiple layers in a seed-mediated growth process. The entire synthesis of designed core-shell catalysts can be completed using metal salts as the precursors with more than 98% yield; and, substantially no cleaning processes are necessary apart from simple rinsing. Accordingly, this method is considered to be a "green" chemistry method.
Brookhaven National Laboratory 04/10/2013
Filed
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BSA 12-17PrototypeAvailable03/30/201503/30/2015

Contact BNL About This Technology

To: Poornima Upadhya<pupadhya@bnl.gov>