Patent application number | Description | Published |
20090145772 | METHOD OF TREATING NANOPARTICLES USING AN INTERMITTENTLY PROCESSING ELECTROCHEMICAL CELL - A method of treating electrically conductive nanoparticles using a dynamic processing electrochemical cell. | 06-11-2009 |
20090145781 | METHOD OF TREATING NANOPARTICLES USING A PROTON EXCHANGE MEMBRANE AND LIQUID ELECTROLYTE CELL - One embodiment of the invention includes an electrochemical cell including a proton exchange membrane and a method of treating nanoparticles using the same. | 06-11-2009 |
20100105548 | METHOD FOR GENERATING A SHELL OF NOBLE METAL OVERLAID ON A CORE OF NON-NOBLE METAL, AND CATALYSTS MADE THEREBY - An electrocatalyst is described. The electrocatalyst includes a core of a non-noble metal or non-noble metal alloy; and a continuous shell of a noble metal or noble metal alloy on the core, the continuous shell being at least two monolayers of the noble metal or noble metal alloy. Methods for making the electrocatalyst are also described. | 04-29-2010 |
20100197490 | Platinum-Coated Non-Noble Metal-Noble Metal Core-Shell Electrocatalysts - Core-shell particles encapsulated by a thin film of a catalytically active metal are described. The particles are preferably nanoparticles comprising a non-noble core with a noble metal shell which preferably do not include Pt. The non-noble metal-noble metal core-shell nanoparticles are encapsulated by a catalytically active metal which is preferably Pt. The core-shell nanoparticles are preferably formed by prolonged elevated-temperature annealing of nanoparticle alloys in an inert environment. This causes the noble metal component to surface segregate and form an atomically thin shell. The Pt overlayer is formed by a process involving the underpotential deposition of a monolayer of a non-noble metal followed by immersion in a solution comprising a Pt salt. A thin Pt layer forms via the galvanic displacement of non-noble surface atoms by more noble Pt atoms in the salt. The overall process is a robust and cost-efficient method for forming Pt-coated non-noble metal-noble metal core-shell nanoparticles. | 08-05-2010 |
20110151356 | Electrocatalyst for Oxygen Reduction with Reduced Platinum Oxidation and Dissolution Rates - The invention relates to platinum-metal oxide composite particles and their use as electrocatalysts in oxygen-reducing cathodes and fuel cells. The invention particularly relates to methods for preventing the oxidation of the platinum electrocatalyst in the cathodes of fuel cells by use of these platinum-metal oxide composite particles. The invention additionally relates to methods for producing electrical energy by supplying such a fuel cell with an oxidant, such as oxygen, and a fuel source, such as hydrogen. | 06-23-2011 |
20110236788 | METHOD FOR MEMBRANE ELECTRODE ASSEMBLY FABRICATION AND MEMBRANE ELECTRODE ASSEMBLY - A method of coating carbon based electrodes and thick electrodes without mud-cracking is described. The electrode ink is deposited on a decal substrate, and transferred to a hot press before the electrode ink is completely dried. The partially dried electrode ink is hot pressed to the membrane to form a membrane electrode assembly. A membrane electrode assembly including a polymer membrane; and a pair of crack-free electrode layers on opposite sides of the polymer membrane, each of the pair of electrode layers having a thickness of at least about 50 μm is also described. | 09-29-2011 |
20110256467 | Cobalt(II) Tetramethoxyphenylporphyrin (CoTMPP) Ionomer Stabilization to Prevent Electrode Degradation - A membrane/electrode assembly for fuel cell applications includes an ion conducting polymer and a porphyrin-containing compound at least partially dispersed within the ion conducting polymer, a first electrode and a second electrode. At least one of the first and second electrodes also includes the porphyrin-containing compound. The membrane/electrode assembly exhibits improved performance over membrane/electrode assembly not incorporating such porphyrin-containing compounds. | 10-20-2011 |
20120122016 | Fuel Cell Durability Through Oxide Supported Precious Metals in Membrane - A fuel cell includes an anode, a cathode, and an ion conducting membrane interposed between the anode and cathode. The ion conducting membrane includes a base layer that has an ion conducting polymer and additive layer that has a metal supported on an oxide support, the oxide support scavenging hydroxyl radicals formed during fuel cell operation. | 05-17-2012 |
20120208108 | Graphite Particle-Supported Pt-Shell/Ni-Core Nanoparticle Electrocatalyst for Oxygen Reduction Reaction - A method for forming an electrocatalyst for fuel cell applications comprises electrolessly depositing a first plurality of nickel particles onto carbon-support particles. The nickel particles are formed from a nickel ion-containing aqueous solution. At least a portion of the nickel particles are replaced with platinum via a galvanic displacement reaction to form a second plurality of nickel particles coated with a platinum layer. During this displacement reaction step, the nickel particles are heated to a temperature sufficient to form the platinum layer. Finally, the second plurality of nickel particles is optionally incorporated into a cathode layer of a fuel cell. | 08-16-2012 |
20120208693 | Graphite Particle-Supported Pt and Pt Alloy Electrocatalyst with Controlled Exposure of Defined Crystal Faces for Oxygen Reduction Reaction (ORR) - A method for forming an electrocatalyst for fuel cell applications comprises electrolessly depositing a first plurality of nickel particles onto carbon-support particles. The nickel particles are formed from a nickel ion-containing aqueous solution. At least a portion of the nickel particles are replaced with platinum via a galvanic displacement reaction to form a second plurality of nickel particles coated with a platinum layer. During this displacement reaction step, the nickel particles are heated to a temperature sufficient to form the platinum layer. Finally, the second plurality of nickel particles is optionally incorporated into a cathode layer of a fuel cell. | 08-16-2012 |