Sandia Corporation

Toyota Motor Engineering & Manufacturing North America, Inc.

Toyota Motor Corporation

Sandia Corporation, Operator of Sandia National Laboratories

Toyota Jidosha Kabushiki Kaisha

Yujiang Song

John A Shelnutt

Craig J Medforth

James E Miller

Wen Li

Tetsuo Kawamura

Yukiyoshi Ueno

Kazuo Kawahara

Michael A Hickner

Eulalia F Pereira

Haorong Wang

Tochi Tudor Nwoga

John Muldoon

Tetsuo Nagami

Hiroaki Takahashi

Frank B Van Swol

Sivakumar R Challa

The invention relates to methods of preparing metal particles on a support material, including platinum-containing nanoparticles on a carbon support. Such materials can be used as electrocatalysts, for example as improved electrocatalysts in proton exchange membrane fuel cells (PEM-FCs).

Photocatalytic methods for preparation of electrocatalyst materials

Metallic nanodisks and a method of making them. The metallic nanodisks are wheel-shaped structures that that provide large surface areas for catalytic applications. The metallic nanodisks are grown within bicelles (disk-like micelles) that template the growth of the metal in the form of approximately circular dendritic sheets. The zero-valent metal forming the nanodisks is formed by reduction of a metal ion using a suitable electron donor species.

Metal nanodisks using bicellar templates

Embodiment of the present invention relate to dendrimers useful for application as catalysts, in particular as improved electrocatalysts for polymer electrolyte membrane fuel cells (PEM-FCs). Methods of preparing such catalysts are described. Examples include dendritic nanostructured metal catalysts, such as platinum and platinum-alloy catalysts.

Dendritic metal nanostructures for fuel cells and other applications

Metal nanostructures formed by photocatalytic interfacial synthesis using a porphyrin-stabilized emulsion template and the method for making the nanostructures. Catalyst-seeded emulsion droplets are employed as templates for hollow-nanoshell growth. The hollow metal nanospheres may be formed with or without inclusions of other materials.

Metallic nanoshells on porphyrin-stabilized emulsions

The invention relates to methods of preparing metal particles on a support material, including platinum-containing nanoparticles on a carbon support. Such materials can be used as electrocatalysts, for example as improved electrocatalysts in polymer electrolyte membrane fuel cells (PEM-FCs).

Durable porous metal nanostructures comprising thin metal nanosheets that are metastable under some conditions that commonly produce rapid reduction in surface area due to sintering and/or Ostwald ripening. The invention further comprises the method for making such durable porous metal nanostructures. Durable, high-surface area nanostructures result from the formation of persistent durable holes or pores in metal nanosheets formed from dendritic nanosheets.

Sintering and ripening resistant noble metal nanostructures

A membrane electrode structure suitable for use in a membrane electrode assembly (MEA) that comprises membrane-affixed metal nanoparticles whose formation is controlled by a photochemical process that controls deposition of the metal nanoparticles using a photocatalyst integrated with a polymer electrolyte membrane, such as an ionomer membrane. Impregnation of the polymer membrane with the photocatalyst prior to metal deposition greatly reduces the required amount of metal precursor in the deposition reaction solution by restricting metal reduction substantially to the formation of metal nanoparticles affixed on or near the surface of the polymer membrane with minimal formation of metallic particles not directly associated with the membrane.

Nanoengineered membrane electrode assembly interface

A metallic nanowire network synthesized using chemical reduction of a metal ion source by a reducing agent in the presence of a soft template comprising a tubular inverse micellar network. The network of interconnected polycrystalline nanowires has a very high surface-area/volume ratio, which makes it highly suitable for use in catalytic applications.

Metallic nanowire networks

Synthesis of metallic nanoshells on porphyrin-stabilized emulsions

Dendritic metal nanostructures made using a surfactant structure template, a metal salt, and electron donor species.

Dendritic metal nanostructures

A nanotagged chemical structure comprising a chemical structure with an associated photocatalyst and a tagging nanoparticle (a nanotag) grown in proximity to the photocatalyst, and a method for making the nanotagged chemical structure. The nanoparticle is grown in proximity to the photocatalyst by using a photocatalytic reduction reaction.

Method of photocatalytic nanotagging

A method for making dendritic metal nanostructures using a surfactant structure template, a metal salt, and electron donor species.

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Albuquerque, NM, United States of America

Yujiang Song