Umicore Ag & Co Kg

Clarkson University

Umicore

Degussa Gmbh

Dmc, Inc

Conpart As

Umicore, S.a.

Particle Technology, Inc.

Dan V Goia

Marco Lopez

Michael Lennartz

Carsten Becker

Stéphanie Chevalliot

Tapan Kumar Sau

Mihaela-Ortansa Jitianu

Karl-Anton Starz

Bernd Kempf

Roger Wolmer

Daniel Andreescu

Joachim Koehler

Volker Bänisch

Brendan P Farrell

Christopher Eastman

Igor V Sevonkaev

Delphine Longrie

Stijn Put

Jan Gilleir

Egon Matijevic

Keith Redford

Kris Driesen

Krishna Balantrapu

Nicolas Marx

Peter Braumann

Andreas Koffler

Sebastian Fritzsche

Jean-Sébastien Bridel

Bernard W Gamson

Daniel Herein

Madhav B Ranade

Geoffrey J Varga

Ionel Halaciuga

Cathrine Braein Nilsen

Benjamin Morrow

Thierry Charles Simon Vandevelde

Inge Fallheier

Corina Goia

Frank Heringhaus

Mechthild Mueller

Dietrich Ruehlicke

John I Njagi

John Bara

This invention relates to a negative electrode material for lithium-ion batteries comprising silicon and having a chemically treated or coated surface influencing the zeta potential of the surface. The active material consists of particles or particles and wires comprising a core comprising silicon, wherein the particles have a positive zeta potential in an interval between pH 3.5 and 9.5, and preferably between pH 4 and 9.5. The core is either chemically treated with an amino-functional metal oxide, or the core is at least partly covered with OSiHgroups, with 1&#x3c;x&#x3c;3, 1&#x2264;y&#x2264;3, and x&#x3e;y, or is covered by adsorbed inorganic nanoparticles or cationic multivalent metal ions or oxides.

Positively charged silicon for lithium-ion batteries

A process for the preparation of an activated polymer particle comprising contacting a polymer particle with at least one polyamine, wherein said polyamine has three or more amino groups, to form a surface treated polymer particle; and applying a catalyst to the surface treated polymer particle to form an activated polymer particle. In some examples, the process can further comprise applying a metal coating to said activated polymer particle to form a metal coated polymer particle.

Process for the surface modification of a polymer particle

The present invention is directed to hollow catalyst particles comprising a layered shell structure and to a method of their manufacture. The catalyst particles have the general formula H/PM/IL/PMin which His the hollow core, PMis a precious metal forming the innermost layer of the shell, IL is an intermediate layer comprising a base metal/precious metal alloy, and PMis a precious metal forming the outermost layer of the shell. The precious metal is selected from Pt, Ir and Pd and mixtures or alloys thereof, and IL is an intermediate layer comprising a base metal/precious metal alloy wherein the concentration of the base metal changes from the periphery of the hollow core to the outer surface of the intermediate layer. The base metal is selected from Co, Ni, and Cu and mixtures thereof.

Catalyst particles comprising hollow multilayered base metal-precious metal core/shell particles and method of their manufacture

The present invention is directed to catalyst particles comprising a layered core-shell-shell structure and to a method of their manufacture. The catalyst particles have the general formula BM/IL/PM in which BM is a base metal core (selected from Co, Ni or Cu), PM is a precious metal outer shell (selected from Pt, Ir or Pd) and IL is an intermediate layer comprising a base metal/precious metal alloy with a concentration gradient of base metal to the outside PM layer. The particles of the present invention comprise a core-shell-shell structure and a substantially continuous precious metal shell layer. They find use in various catalytic applications, for example in gas-phase catalysis, in electrocatalysts for fuel cells, in catalytic converters for automobiles and in electronic or medical applications.

Catalyst particles comprising a layered core-shell-shell structure and method of their manufacture

The present invention provides a method for forming compositions having a plurality of ultra-fine metallic particles, and the metallic composition produced therewith. Also provided is a substrate coated with the plurality of ultra-fine metallic particles obtained in accordance with the method of the present invention.

Aqueous-based method for producing ultra-fine metal powders

The invention discloses core/shell, type catalyst particles comprising a M/Mstructure with M=inner particle core and M=outer particle shell, wherein the medium diameter of the catalyst particle (d) is in the range of 20 to 100 nm, preferably in the range of 20 to 50 nm. The thickness of the outer shell (t) is about 5 to 20% of the diameter of the inner particle core of said catalyst particle, preferably comprising at least 3 atomic layers. The core/shell type catalyst particles, particularly the particles comprising a Pt&#x2dc;based shell reveal a high specific activity. The catalyst particles are preferably supported on suitable support materials such as carbon black and are used as electrocatalysts for fuel cells.

Core/shell-type catalyst particles and methods for their preparation

The present invention is directed to a method for preparing colloidal dispersions of precious metal nanoparticles selected from the group consisting of Pt, Au, Pd, Ag, Rh, Ru and mixtures or alloys thereof, and to a method for isolating such precious metal nanoparticles from these colloidal dispersions. The colloidal dispersions are prepared by reducing suitable precious metal precursor compounds in aqueous alkaline solutions at reaction temperatures between 40 and 70&#xb0; C. and a pH&#x2267;12.0 in the presence of polysaccharides with average molecular weights (M) in the range of 300,000 to 1,000,000. The precious metal nanoparticles are isolated after decomposing the polysaccharide by heating the colloidal dispersions to temperatures &#x3e;80&#xb0; C. The nanoparticles can be used for the manufacture of core/shell-type catalyst materials and for electronic, decorative and medical applications.

Method for preparing dispersions of precious metal nanoparticles and for isolating such nanoparticles from said dispersions

Nanoparticles which contain noble metals alone or noble metals in combination with base metals. The nanoparticles are embedded in an aqueous solution of a temporary stabilizer based on a polysaccharide.

Noble metal nanoparticles, a process for preparing these and their use

The invention discloses core/shell type catalyst particles comprising a M/Mstructure with M=inner particle core and M=outer particle shell, wherein the medium diameter of the catalyst particle (d) is in the range of 20 to 100 nm, preferably in the range of 20 to 50 nm. The thickness of the outer shell (t) is about 5 to 20% of the diameter of the inner particle core of said catalyst particle, preferably comprising at least 3 atomic layers. The core/shell type catalyst particles, particularly the particles comprising a Pt-based shell, reveal a high specific activity. The catalyst particles are preferably supported on suitable support materials such as carbon black and are used as electrocatalysts for fuel cells.

The invention discloses core/shell type catalyst particles comprising a M/Mstructure with M=inner particle core and M&#x2212;outer particle shell, wherein the medium diameter of the catalyst particle (d) is &#x2267;20 nm. The thickness of the outer shell (t) comprises at least 3 atomic layers. The core/shell type catalyst particles, particularly the particles comprising a Pt-based shell, reveal a high specific activity. The catalyst particles are preferably supported on suitable support materials such as carbon black and are used as electrocatalysts for fuel cells.

The invention provides a method for manufacturing supported noble metal based alloy catalysts with a high degree of alloying and a small crystallite size. The method involves using polyol solvents as reaction medium and comprises a two-step reduction process in the presence of a support material. In the first step, the first metal (transition metal; e.g. Co, Cr, Ru) is activated by increasing the reaction temperature to 80 to 160&#xb0; C. In the second step, the second metal (noble metal; e.g. Pt, Pd, Au) is added and the slurry is heated to the boiling point of the polyol solvent in a range of 160 to 300 &#xb0; C. The catalysts manufactured according to the method are used as electrocatalysts for polymer electrolyte membrane fuel cells (PEMFC), direct-methanol fuel cells (DMFC) or as gas phase catalysts for CO oxidation or exhaust gas purification.

Method for manufacture of noble metal alloy catalysts and catalysts prepared therewith

The invention is directed to core/shell type catalyst particles comprising a M/Mstructure with M=inner particle core and M=outer particle shell, wherein the medium diameter of the catalyst particle (d+) is in the range of 20 to 100 nm, 5 preferably in the range of 20 to 50 nm. The thickness of the outer shell (t) is about 5 to 20% of the diameter of the inner particle core of said catalyst particle, preferably comprising at least 3 atomic layers. The inner particle core (M) of the particles comprises metal or ceramic materials, whereas the material of the outer shell (M) comprises precious metals and/or alloys thereof. The core/shell type catalyst particles are preferably supported on suitable support materials such as carbon black and can be used as electrocatalysts for fuel cells and for other catalytic applications.

Core / shell-type catalyst particles comprising metal or ceramic core materials and methods for their preparation

The invention provides an aqueous solution-based method for producing nanosized silver platelets, which employs the controlled mixing of a silver ion solution, a reducing solution, and an acidic solution in the presence of palladium ions.

Silver platelets comprising palladium

Growing community of inventors

Potsdam, NY, United States of America

Dan V Goia