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Showing 1 to 20 of 29 for “"platinum catalyst"”.
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Oscillations in the Oxidation of Carbon-Monoxide on an Unsupported Platinum Catalyst
Made available in DSpace on 2014-12-13T18:55:33Z (GMT). No. of bitstreams: 1 7624162.pdf: 5341472 bytes, checksum: e7529b61caea6854a861f785d1f820cd (MD5) Previous issue date: 1976
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Impact of carbon support chemistry, morphology, and structure on platinum catalyst durability for PEMFC applications
… we have found that higher surface area cathode catalysts suffer greater performance losses over their lifetime due in large part to changes in their porosity. Higher surface area carbons are also characterized by discontinuous graphite structures, making them more susceptible to oxidation than …
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A study of formic acid electrocatalysis as a step towards the development of an industrially significant platinum catalyst
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:02:44Z Item is restricted indefinitely.
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Low platinum loading electrospun electrodes for proton exchange membrane fuel cells
… carbon nanofiber supports for sputtered platinum catalyst in proton exchange membrane fuel cells. The performance of the sputtered nanofiber supports was similar to that of sputtered commercial gas diffusion layers in single cell fuel cell tests. However, sputtered platinum electrodes …
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Pneumatic battery : a chemical alternative to pneumatic energy storage
… This decomposition is sped up with the aid of a platinum catalyst. A mechanical negative feedback system regulates the exposure of the catalyst, allowing the battery to generate a user specified pressure at its outlet. The prototype produced was observed to generate an outlet pressure of up to …
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Experimental Investigation of the Effect of Composition on the Performance and Characteristics of PEM Fuel Cell Catalyst Layers
The catalyst layer of a proton exchange membrane (PEM) fuel cell is a mixture of polymer, carbon, and platinum. The characteristics of the catalyst layer play a critical role in determining the performance of the PEM fuel cell. This research investigates the role of catalyst layer composition using …
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Investigation of the Effect of Catalyst Layer Composition on the Performance of PEM Fuel Cells
The catalyst layer of a proton exchange membrane (PEM) fuel cell is a porous mixture of polymer, carbon, and platinum. The characteristics of the catalyst layer play a critical role in determining the performance of the PEM fuel cell. In this research, sample membrane electrode assemblies (MEAs) …
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Anodic alcohol fuel cell reactions at platinum active sites on doped metal oxide supports
… which take place on the carbon supported platinum catalyst (Pt/C). As attractive as these devices may seem, their practicality is often limited by the functionality of the carbon support, which can be prone to corrosion. To limit the corrosion associated with a carbon-based catalyst, metal …
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Mechanistic studies of magnesium electrodeposition and oxygen reduction for energy storage applications
… via two pathways. Oxygen binding energy to the catalyst has previously been shown to determine the activity of the catalyst. Here we use a novel set of comparative experiments to measure the strain in the platinum catalyst due to oxygen binding in in situ measurements over a wide potential …
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Development of a semi–empirical reaction kinetic model for PEM fuel cells
… is therequirement for expensive noble metal catalysts (platinum and ruthenium). Furthermore 75% of the overpotential losses at the cathode are due to the activation of the oxygen reduction reaction (ORR). To reduce the platinum content requirements and understand the cause of the large …
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Dynamic Incompressible Navier-Stokes Model of Catalytic Converter in 1-D Including Fundamental Oxidation Reaction Rate Expressions
… one-dimensional (1D) models of automotive catalysts are effective in designing catalyst systems that meet current emission standards. These models use various assumptions in order to simplify the mathematical formulation. Although these postulations have been effective in the past, they …
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Metal-Catalyzed Formation and Transformations of Carbon-Boron Bonds
… are unselective. To address this shortcoming, a platinum catalyst was developed for the diboration of 1,1-diaryl allenes with a differentially protected diboron reagent, pinB-Bdan. The reaction proceeds regioselectively in high yields to furnish olefins bearing a vinylic Bpin and an allylic Bdan …
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An air-breathing, portable thermoelectric power generator based on a microfabricated silicon combustor
… combustion of butane over an alumina-supported platinum catalyst. The system was integrated with commercial bismuth telluride thermoelectric modules to produce 5.8 W of electrical power with a chemical-to-electrical conversion efficiency of 2.5% (based on lower heating value). The energy and …
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Indirect Detection of Explosive Vapours by Thermal Dissociation Cavity Ring-Down Spectroscopy
… of the explosive detection methods utilizes a platinum catalyst heated to 350 °C to catalyze the thermal dissociation of nitroaromatic explosives, such as 2,4,6 trinitrotolune (TNT), to NO2 prior to detection. The catalytic thermal dissociation (cTD) CRDS was found to have a (1s, 3σ) limit of …
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Single stage boost inverter for standalone fuel cell applications
… be manufactured in South Africa because of the platinum catalyst required. South Africa is rich in platinum and, therefore, the PEMFC system can be cost-effectively produced. In residential stationary applications of the PEMFC a power conditioning system is required to convert the de voltage …
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Catalyst Layer Design in Polymer Membrane Fuel Cells
… electrolyte membrane fuel cells is the use of platinum as a catalyst. One way to overcome this obstacle is to replace platinum with non-platinum group metal (non-PGM) catalysts, particularly for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). The most …
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Synthesis and characterization of Pt/TiO2/C composite catalysts for fuel cells prepared using a glucose modifier
Catalysts in the electrodes of polymer exchange membrane fuel cells (PEMFCs) serve a critical function in reactions which can be used to generate electrical energy from chemical fuels. Pt nanoparticles are commonly dispersed on a conductive support and used as electrode materials in these devices …
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Photoelectrochemical fuel synthesis using organic semiconductors with (bio)molecular catalysts
… and photocathodes interfaced with a platinum catalyst achieved unprecedented long-term H2 production over 300 h, especially in a benign pH-neutral aqueous solution. This tackled the main bottleneck in the organic PEC field, proving that acidic buffers are not always needed for optimal …
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The Leaching of Cobalt in Platinum-Cobalt Fuel Cell Catalysts
Platinum-cobalt catalysts have proved to be promising alternatives to the conventional platinum catalyst used for the ORR reaction at the cathode of PEM fuel cells. These catalysts, however, undergo leaching of cobalt in the harsh environment of the fuel cell during its operation as well as during …
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