Electrochemical Synthesis of Elongated Noble Metal Nanoparticles, such as Nanowires and Nanorods, on High-Surface Area Carbon Supports
a carbon nanoparticle, high-surface area technology, applied in the field of nanoparticles, can solve the problems of increasing both the number of processing steps and the overall cost, reducing the catalytic activity of particles, and affecting the synthesis efficiency of nanoparticles, so as to facilitate a more efficient expedient, facilitate the synthesis of a more efficient process, and maximize the catalytically active surface area
Inactive Publication Date: 2015-10-22
BROOKHAVEN SCI ASSOCS
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Benefits of technology
This method results in nanoparticles with high catalytic activity and improved durability, allowing for efficient and cost-effective production of catalytic electrodes for energy conversion devices like fuel cells, with enhanced stability and reduced noble metal loading.
Problems solved by technology
However, the inclusion of an organic material during particle synthesis significantly lowers the catalytic activity of the particles.
Removal of the organic material using Prior Art techniques requires the use of additional washing and / or heating processes which increase both the number of processing steps and the overall cost.
Furthermore, even with the appropriate cleaning steps, a residual organic layer typically remains on the surfaces of the nanoparticles.
Method used
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[0024]The generalized process for forming elongated nanoparticles according to the disclosed method is described by the flowchart shown in FIG. 1. The method not only provides a deposition process that takes minutes in comparison with hours or days in comparable chemical routes, but also does not require the use of capping agents, surfactants, or other organic compounds to facilitate a heightened catalytic activity. Surfactants nave generally been used to control the particle size and to attain a higher particle yield. However, the inclusion of an organic material during particle synthesis significantly lowers the catalytic activity of the particles. Removal of the organic material using Prior Art techniques requires the use of additional washing and / or heating processes which increase both the number of processing steps and the overall cost. Furthermore, even with the appropriate cleaning steps, a residual organic layer typically remains on the surfaces of the nanoparticles. Finall...
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Abstract
Elongated noble-metal nanoparticles and methods for their manufacture are disclosed. The method involves the formation of a plurality of elongated noble-metal nanoparticles by electrochemical deposition of the noble metal on a high surface area carbon support, such as carbon nanoparticles. Prior to electrochemical deposition, the carbon support may be functionalized by oxidation, thus making the manufacturing process simple and cost-effective. The generated elongated nanoparticles are covalently bound to the carbon support and can be used directly in electrocatalysis. The process provides elongated noble-metal nanoparticles with high catalytic activities and improved durability in combination with high catalyst utilization since the nanoparticles are deposited and covalently bound to the carbon support in their final position and will not change in forming an electrode assembly.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Divisional of Copending U.S. patent application Ser. No. 13 / 624,149, filed Sep. 21, 2012, which is a Continuation-In-Part (CIP) of U.S. patent application Ser. No. 12 / 603,216, filed Oct. 21, 2009, U.S. Pat. No. 8,699,207, which claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Application No. 61 / 107,048, filed Oct. 21, 2008, U.S. patent application Ser. No. 13 / 624,149 is also a Continuation-In-Part (CIP) of PCT Patent Application No. PCT / US2011 / 43901, filed Jul. 13, 2011, which claims the benefit under 35U.S.C. 119(e) of U.S. Provisional Application No. 61 / 364, 040, filed Jul. 14, 2010, U.S. patent application Ser. No. 13 / 624,149 also claims the benefit, under 35 U.S.C. §119(e) of U.S. Provisional Application No. 61 / 537,814, filed Sep. 22, 2011. The content of all above-referenced applications is incorporated herein in its entirety.STATEMENT OF GOVERNMENT RIGHTS[0002]The present invention was made with g...
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IPC IPC(8): H01M4/90H01M4/92
CPCH01M4/926H01M4/9083B82Y30/00B82Y40/00H01G11/36H01G11/46H01M4/8657Y02E60/50Y02E60/13
InventorADZIC, RADOSLAVBLIZNAKOV, STOYANVUKMIROVIC, MIOMIR
OwnerBROOKHAVEN SCI ASSOCS