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Ruthenium on Carbon Nanostructures for Supercapacitor Electrodes

Brookhaven National Laboratory

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<p>
	Process flow for deposition of a smooth and conformal noble metal adlayer onto a carbon nanostructure</p>

Process flow for deposition of a smooth and conformal noble metal adlayer onto a carbon nanostructure

Technology Marketing Summary

Supercapacitors are electrical storage devices that can deliver a huge amount of energy in a short time. Such a surge of energy is important in hybrid electric and fuel cell-powered vehicles, as well as in a wide range of electronic and engineering applications. Since the energy storage capability and the current carrying capability of supercapacitors are proportional to their capacitance, it is important to have as much surface area as possiblein the electrode. A smooth and conformal adlayer of ruthenium, a widely used electrode material, deposited on carbon nanostructures such as nanohorns can supply the requisite high surface area with low metal requirements.

Description

High-surface-area carbon nanostructures coated with a smooth and conformal submonolayer-to-multilayer thin metal films and their method of manufacture are described.  The preferred manufacturing process involves the initial oxidation of the carbon nanostructures followed by a surface preparation process involving immersion in a solution with the desired pH to create negative surface dipoles.  The nanostructures are subsequently immersed in an alkaline solution containing a suitable quantity of non-noble metal ions which adsorb at surface reaction sites.  The metal ions are then reduced via chemical or electrical means.  The nanostructures are exposed to a solution containing a salt of one or more noble metals which replace adsorbed non-noble surface metal atoms by galvanic displacement.  The process can be controlled and repeated to obtain a desired film coverage.  The resulting coated nanostructures may be used, for example, as high-performance electrodes in supercapacitors, batteries, or other electric storage devices.

Benefits

The inventive nanostructures provide higher surface area of electrode metal with lower total metal components for higher capacitance and lower cost electrodes.

Applications and Industries

High-performance electrodes for supercapacitors, batteries, or other electric storage devices.

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 8,699,207
Patent
8,699,207
Electrodes synthesized from carbon nanostructures coated with a smooth and conformal metal adlayer
High-surface-area carbon nanostructures coated with a smooth and conformal submonolayer-to-multilayer thin metal films and their method of manufacture are described. The preferred manufacturing process involves the initial oxidation of the carbon nanostructures followed by a surface preparation process involving immersion in a solution with the desired pH to create negative surface dipoles. The nanostructures are subsequently immersed in an alkaline solution containing a suitable quantity of non-noble metal ions which adsorb at surface reaction sites. The metal ions are then reduced via chemical or electrical means. The nanostructures are exposed to a solution containing a salt of one or more noble metals which replace adsorbed non-noble surface metal atoms by galvanic displacement. The process can be controlled and repeated to obtain a desired film coverage. The resulting coated nanostructures may be used, for example, as high-performance electrodes in supercapacitors, batteries, or other electric storage devices.
04/15/2014
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BSA 08-28PrototypeAvailable04/29/201104/29/2011

Contact BNL About This Technology

To: Poornima Upadhya<pupadhya@bnl.gov>