Patents by Inventor Yung-eun Sung
Yung-eun Sung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20150196897Abstract: The present disclosure relates to a PtAu nanoparticle catalyst heat-treated in the presence of carbon monoxide (CO) and a method for preparing same. Since the PtxAuy nanoparticle catalyst heat-treated under CO atmosphere has high Pt surface area and superior oxygen reduction reaction (ORR) activity, a high-efficiency, high-quality fuel cell can be achieved by applying the catalyst to a fuel cell.Type: ApplicationFiled: February 28, 2014Publication date: July 16, 2015Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Jong Hyun JANG, Yung-Eun SUNG, Hee-young PARK, Hyoung-Juhn KIM, Dirk HENKENSMEIER, Suk Woo NAM, Hyung Chul HAM, Tae-Hoon LIM, Sung Jong YOO, Eun Ae CHO, Kug-Seung LEE
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Publication number: 20150162619Abstract: The present invention relates to an electrode catalyst, a method for preparing the electrode catalyst, and a membrane electrode assembly and a fuel cell including the electrode catalyst. The electrode catalyst includes a carbon support and a platinum catalyst supported on the carbon support. A thermally responsive polymer is selectively bound to the carbon support. The electrode catalyst can ensure smooth discharge of water produced as a result of an electrochemical reaction, achieving improved electrical performance of the fuel cell.Type: ApplicationFiled: October 24, 2013Publication date: June 11, 2015Inventors: Sang Moon Kim, Namgee Jung, Kahp-Yang Suh, Yung-Eun Sung, Man Soo Choi
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Publication number: 20150072236Abstract: Using metal foams for the electrode of secondary lithium battery, preparing method thereof, and secondary lithium battery including the metal foam. A metal foam is used in an electrode of secondary lithium battery where the surface and the inner pore walls are coated with the active materials, a method of manufacturing such metal foam, and secondary lithium battery including the metal foam.Type: ApplicationFiled: April 18, 2014Publication date: March 12, 2015Inventors: Ji Hyun Um, Hyeji Park, Myounggeun Choi, Hyelim Choi, Yong-Hun Cho, Yung-Eun Sung, Heeman Choe
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Publication number: 20140230890Abstract: A dye-sensitized solar cell has a working electrode, electrolyte, and counter electrode. The counter electrode includes a nickel (Ni) foam, titanium (Ti) foam, manganese (Mn) foam, or molybdenum (Mo) foam, and has a surface that is nitrided. The reaction efficiency for the solar cell is enhanced by the increased surface area reacting with the electrolyte, which results from using a metal foam. Mechanical properties, such as strength and ductility, and electroconductivity are improved due to the use of metals. The production costs are reduced by using substitute materials, which are low-cost and have oxidation-reduction efficiency.Type: ApplicationFiled: September 18, 2013Publication date: August 21, 2014Applicant: CellMotive Co. Ltd.Inventors: Sunha Park, Yong-Hun Cho, Hyungyung Jo, Myounggeun Choi, Yung-Eun Sung, Heeman Choe
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Publication number: 20140004441Abstract: An innovative fuel cell system with MEAs includes a polymer electrolyte membrane, a gas diffusion layer (GDL) made of porous metal foam, and a catalyst layer. A fuel cell has a metal foam layer that improves efficiency and lifetime of the conventional gas diffusion layer, which consists of both gas diffusion barrier (GDB) and microporous layer (MPL). This metal foam GDL enables consistent maintenance of the suitable structure and even distribution of pores during the operation. Due to the combination of mechanical and physical properties of metallic foam, the fuel cell is not deformed by external physical strain. Among many other processing methods of open-cell metal foams, ice-templating provides a cheap, easy processing route suitable for mass production. Furthermore, it provides well-aligned and long channel pores, which improve gas and water flow during the operation of the fuel cell.Type: ApplicationFiled: June 28, 2013Publication date: January 2, 2014Inventors: Yong-Hun Cho, Hyelim Choi, Ok-Hee Kim, Yung-Eun Sung, Heeman Choe
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Patent number: 8524420Abstract: Disclosed is a method for preparing nickel or palladium nanoparticles supported on a carbon support. To a mixture solution wherein a stabilizer is dissolved in 1,2-propanediol, a carbon support is added to prepare a dispersion. Then, a precursor solution wherein a nickel or palladium precursor dissolved in 1,2-propanediol is mixed therewith and stirred. Then, nickel or palladium nanoparticles supported on the carbon support are prepared by reduction. The disclosed method for preparing nickel or palladium nanoparticles supported on a carbon support allows preparation of nanoparticles with narrow particle size distribution and good dispersibility through a simple process and the resulting nickel or palladium nanoparticles may be usefully applied, for example, as electrode materials of fuel cells.Type: GrantFiled: May 13, 2010Date of Patent: September 3, 2013Assignees: Hyundai Motor Company, SNU & R&DB FoundationInventors: Nak Hyun Kwon, Jae Seung Lee, Bumwook Roh, Yung-Eun Sung, Tae-Yeol Jeon, Hee-Young Park, Ju Wan Lim, Young-Hoon Chung
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Publication number: 20120244457Abstract: The present invention provides an electrode for a polymer electrolyte membrane fuel cell. In one embodiment, a planar nanoporous or microporous metal foam or metal aerogel structure is provided, from which an electrode with a catalyst layer integrally formed by fixing a catalyst in the metal foam or metal aerogel is formed.Type: ApplicationFiled: July 6, 2011Publication date: September 27, 2012Applicants: SNU R&DB FOUNDATION, HYUNDAI MOTOR COMPANYInventors: Nak Hyun Kwon, In Chul Hwang, Jae Seung Lee, Bum Wook Roh, Yung Eun Sung, Ju Wan Lim, Yoon Hwan Cho, Nam Gee Jung, Hee Man Choe, Yong Hun Cho
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Patent number: 8110521Abstract: The present invention features a method for preparing core-shell nanoparticles supported on carbon. In particular, the present invention features a method for preparing core-shell nanoparticles supported on carbon, including: dispersing core nanoparticle powder supported on carbon in ethanol; adding a metal precursor which forms a shell and hydroquinone thereto; and mixing and reducing the same. Preferably, the disclosed method for preparing core-shell nanoparticles supported on carbon enables coating of transition metal nanoparticles including platinum on the surface of core metal nanoparticles at a monolayer level. Prepared core-shell nanoparticles of the present invention may be useful as catalysts or electrode materials of fuel cells.Type: GrantFiled: April 1, 2010Date of Patent: February 7, 2012Assignees: Hyundai Motor Company, SNU R&DB FoundationInventors: Jae Seung Lee, Yung-Eun Sung, Tae-Yeol Jeon, Hee-Young Park
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Publication number: 20110318668Abstract: Disclosed herein are a membrane-electrode assembly for a fuel cell, a fuel cell, and a manufacturing method thereof. The present invention forms a micro current collecting layer between a gas diffusion layer and a micro porous layer and surface-contacts a pair of laminates for an electrode so that each electrolyte layer formed by applying an electrolyte solution thereon contacts with each other, thereby shortening a moving distance of electrons to minimize the current collecting resistance and loss and reduce the interface resistance.Type: ApplicationFiled: March 28, 2011Publication date: December 29, 2011Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Eon Soo Lee, Yung Eun Sung, Min Jeh Ahn, Yong Hun Cho, Nam Gee Jung, Jae Hyuk Jang
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Publication number: 20110129763Abstract: The present invention features a method for preparing core-shell nanoparticles supported on carbon. In particular, the present invention features a method for preparing core-shell nanoparticles supported on carbon, including: dispersing core nanoparticle powder supported on carbon in ethanol; adding a metal precursor which forms a shell and hydroquinone thereto; and mixing and reducing the same. Preferably, the disclosed method for preparing core-shell nanoparticles supported on carbon enables coating of transition metal nanoparticles including platinum on the surface of core metal nanoparticles at a monolayer level. Prepared core-shell nanoparticles of the present invention may be useful as catalysts or electrode materials of fuel cells.Type: ApplicationFiled: April 1, 2010Publication date: June 2, 2011Applicants: HYUNDAI MOTOR COMPANY, SNU R&DB FOUNDATIONInventors: Jae Seung Lee, Yung-Eun Sung, Tae-Yeol Jeon, Hee-Young Park
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Publication number: 20110123908Abstract: Disclosed is a method for preparing nickel or palladium nanoparticles supported on a carbon support. To a mixture solution wherein a stabilizer is dissolved in 1,2-propanediol, a carbon support is added to prepare a dispersion. Then, a precursor solution wherein a nickel or palladium precursor dissolved in 1,2-propanediol is mixed therewith and stirred. Then, nickel or palladium nanoparticles supported on the carbon support are prepared by reduction. The disclosed method for preparing nickel or palladium nanoparticles supported on a carbon support allows preparation of nanoparticles with narrow particle size distribution and good dispersibility through a simple process and the resulting nickel or palladium nanoparticles may be usefully applied, for example, as electrode materials of fuel cells.Type: ApplicationFiled: May 13, 2010Publication date: May 26, 2011Applicants: HYUNDAI MOTOR COMPANY, SNU R&DB FOUNDATIONInventors: Nak Hyun Kwon, Jae Seung Lee, Bumwook Roh, Yung-Eun Sung, Tae-Yeol Jeon, Hee-Young Park, Ju Wan Lim, Young-Hoon Chung
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Publication number: 20110104588Abstract: The present invention provides a method of synthesizing a nano-sized transition metal catalyst on a carbon support, including dissolving a stabilizer in ethanol thus preparing a mixture solution, adding a support to the mixture solution thus preparing a dispersion solution, dissolving a transition metal precursor in ethanol thus preparing a precursor solution, mixing the precursor solution with the dispersion solution with stirring, and then performing reduction, thus preparing the nano-sized transition metal catalyst. This method enables the synthesis of transition metal nanoparticles supported on carbon powder having a narrow particle size distribution and a wide degree of dispersion through a simple process, and is thus usefully applied to the formation of an electrode material or the like of a fuel cell.Type: ApplicationFiled: May 6, 2010Publication date: May 5, 2011Applicants: HYUNDAI MOTOR COMPANY, SNU R&DB FOUNDATIONInventors: Nak Hyun Kwon, Inchul Hwang, Jae Seung Lee, Yung-Eun Sung, Tae-Yeol Jeon, Sung Jong Yoo, Kug-Seung Lee, Yong-Hun Cho
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Patent number: 7825057Abstract: The present invention relates to a process for preparing electrode catalyst materials for a polymer electrolyte membrane fuel cell (PEMFC), and particularly to a high-performance platinum-non-platinum mixed electrode catalyst (Pt—RuOs/C) having a physically mixed structure of RuOs alloy and platinum materials, which is prepared by adding a small amount of platinum (Pt) to RuOs alloy materials highly dispersed on a carbon support, where the amount of platinum used is drastically reduced as compared to the conventional platinum materials, thus lowering the manufacturing cost.Type: GrantFiled: November 16, 2007Date of Patent: November 2, 2010Assignee: Hyundai Motor CompanyInventors: Nak Hyun Kwon, Yung Eun Sung, In Su Park, Yong Hun Cho, In Chul Hwang, Il Hee Cho
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Publication number: 20090227445Abstract: A method of preparing a platinum alloy catalyst for a fuel cell electrode includes: (a) adding a carbon material, a platinum precursor, and a transition metal precursor to ethanol and dispersing the mixture; (b) adding sodium acetate powder or an ammonia solution containing ethanol as a solvent to the solution obtained in step (a) and stirring the resulting solution; (c) adding sodium borohydride to the solution obtained in step (b) and reducing the metal ions of the platinum precursor and the transition metal precursor; and (d) obtaining a platinum alloy catalyst in the form of powder through washing and drying processes. This method can reduce the amount of platinum to be used for manufacturing a fuel cell electrode and thereby reduce the manufacturing cost.Type: ApplicationFiled: November 24, 2008Publication date: September 10, 2009Applicants: HYUNDAI MOTOR COMPANY, SEOUL NATIONAL UNIVERSITY INDUSTRY FOUNDATIONInventors: Jae Seung Lee, Yung-Eun Sung, Yong-Hun Cho, Tae Yeol Jeon
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Publication number: 20090005237Abstract: The present invention relates to a process for preparing electrode catalyst materials for a polymer electrolyte membrane fuel cell (PEMFC), and particularly to a high-performance platinum-non-platinum mixed electrode catalyst (Pt—RuOs/C) having a physically mixed structure of RuOs alloy and platinum materials, which is prepared by adding a small amount of platinum (Pt) to RuOs alloy materials highly dispersed on a carbon support, where the amount of platinum used is drastically reduced as compared to the conventional platinum materials, thus lowering the manufacturing cost.Type: ApplicationFiled: November 16, 2007Publication date: January 1, 2009Applicant: Hyundai Motor CompanyInventors: Nak Hyun Kwon, Yung Eun Sung, In Su Park, Yong Hun Cho, In Chul Hwang, Il Hee Cho
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Patent number: 6916764Abstract: Provided is a Pt—Ru based quaternary metal anode catalyst for a direct methanol fuel cell (DMFC). The Pt—Ru based quaternary metal anode catalyst has high activity to methanol oxidation and strong resistance to catalyst poisoning due to carbon monoxide (CO), which is a byproduct of the methanol oxidation. Therefore, the Pt—Ru based quaternary metal anode catalyst can give high power density and can replace existing commercial catalysts.Type: GrantFiled: September 13, 2002Date of Patent: July 12, 2005Assignee: Samsung SDI Co., Ltd.Inventors: Kyoung Hwan Choi, Seol-ah Lee, Yung-eun Sung, Kyung-won Park, Jong-ho Choi
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Publication number: 20050016586Abstract: A method for fabricating a counter electrode for a dye-sensitized solar cell includes co-sputtering platinum and a metal oxide as target materials to deposit nanocrystalline platinum and an amorphous metal oxide on the substrate. The counter electrode exhibits improved performances as an electro-catalyst to assist in the reduction of I3? during operation of a dye-sensitized solar cell.Type: ApplicationFiled: January 23, 2004Publication date: January 27, 2005Applicant: Kwangju Institute of Science and TechnologyInventors: Seok-Soon Kim, Kyung-Won Park, Jun-Ho Yum, Yung-Eun Sung
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Patent number: 6627060Abstract: A method for coating a phosphor on a flat display using electrophoretic deposition (EPD) and lithography is provided. In the method, an adhesive strength can be enhanced without passing through a high-temperature thermal treatment process as a post-process. Phosphor powders are coated on a substrate by a field emission display (FED) and then a ultraviolet (UV) curable layer is coated. Then, an adhesive strength of the phosphor can be greatly enhanced through UV irradiation, in comparison with a post-process such as a thermal treatment process. Also, the UV curable layer can be lithographically etched by the UV light, and thus the phosphor can be coated by a predetermined pattern, to then be applied to a next-generation display such as a FED or PDP as an optimal method for full color realization.Type: GrantFiled: October 25, 2000Date of Patent: September 30, 2003Assignee: Kwangju Institute of Science and TechnologyInventors: Jun Ho Yum, Yung Eun Sung
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Publication number: 20030157393Abstract: Provided is a Pt—Ru based quaternary metal anode catalyst for a direct methanol fuel cell (DMFC). The Pt—Ru based quaternary metal anode catalyst has high activity to methanol oxidation and strong resistance to catalyst poisoning due to carbon monoxide (CO), which is a byproduct of the methanol oxidation.Type: ApplicationFiled: September 13, 2002Publication date: August 21, 2003Applicant: Samsung Electronics Co., Ltd.Inventors: Kyoung Hwan Choi, Seol-Ah Lee, Yung-Eun Sung, Kyung-Won Park, Jong-Ho Choi
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Patent number: 6506228Abstract: A method for preparing a platinum alloy electrode catalyst for DMFC using anhydrous metal chlorides. The method includes reducing platinum chloride and non-aqueous second metal chloride with boron lithium hydride (LiBH4) in a water-incompatible organic solvent in a nitrogen atmosphere to form nano-sized particles of colloidal platinum alloy, and drying the platinum alloy particles without any heat treatment. The method of preparing a platinum alloy catalyst according to the present invention makes it possible to prepare platinum alloy particles having a narrow range of size distribution and an average particle size of less than 2 nm with ease, relative to the conventional methods. The platinum alloy particles thus obtained can be used as an electrode catalyst for DMFC to enhance methanol oxidation performance.Type: GrantFiled: March 23, 2001Date of Patent: January 14, 2003Assignee: Kwangju Institute of Science and TechnologyInventors: Seol Ah Lee, Kyung Won Park, Boo Kil Kwon, Yung Eun Sung