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Showing 1 to 20 of 41 for “"Rotating Disk Electrode"”.
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Rotating Disk Electrode Design for Concentration Measurements in Flowing Molten Chloride Salts
… this study attempts to understand. Two different rotating electrodes were designed to simulate flowing conditions in an electrochemical cell. The first was a tungsten rotating disk electrode (RDE) and the second was a graphite RDE. We were not able to fully insulate the tungsten RDE and were …
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On the reduction of oxygen from dispersed media
… Oxygen was reduced from the emulsion on a rotating disk electrode. The dispersed phase did not contribute to the oxygen transport to the surface of a rotating disk electrode. An explanation is given based on the hydrodynamics of an emulsion under a rotating disk electrode. To eliminate the …
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Some Problems in Spectrochemical Analysis: I. Spectrochemical Determination of Trace Metals in Synthetic Plant Ash Materials. Ii. Direct Reading and Spectrographic Analysis of Lubricating Oils Using the Rotating Disk Electrode. Iii. The Quantometric Determination of Phosphorus in Low Alloy Iron
Made available in DSpace on 2014-12-05T19:35:55Z (GMT). No. of bitstreams: 1 0009073.pdf: 3535935 bytes, checksum: 1902f81bb93bf92460fbe70779467de5 (MD5) Previous issue date: 1954
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Oxygen as a Mass Transport Probe in Polymer Films (Chronocoulometry, Hydrodynamic)
… several ferricyanide-loaded PVP films on a rotating disk electrode allows evaluation of permeation coefficients. (kD(,S)). A background-subtraction chronocoulometric technique allows the examination of diffusion behavior within such films primarily in a chosen oxidation state. For the system …
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Exoelectrogenic biofilm growth in shearing flows
… chronoamperometry, and cyclic voltammetry in a rotating disk electrode are ideal for studying adhesion of microbes to metallic surfaces under shear. We study the adhesion of Escherichia coli, Bacillus subtilis, and 1 μm silica microspheres over a range of shear stresses. Our results agree with …
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Advanced electrochemical characterization of copper deposition
The electrodeposition of copper metal in a concentrated sulfuric acid solution is reported to occur through a four-step mechanism: (I) the dehydration of Cu2+ (H2O)6, (II) the reduction of Cu2+ to cu+, (III) the dehydration cu+ (H2O)6-x, (IV) the reduction of Cu+ to copper metal. The dehydration …
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Trace detection of mercury using boron-doped diamond electrodes
… techniques using Boron-doped Diamond (BDD) electrodes for the purpose of detecting mercury in solutions in the ppb-ppt range. Differential Pulse Voltammetry (DPV) was used successfully to develop calibration curves for mercury detection in standard solutions in the ppb-ppt range, followed by …
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The effects of chemical pressurization on screen electrode fuel cells
… to PGD fuel cells exist. Fluidized bed electrodes (FBE), packed bed electrodes, and packed screen electrodes are discussed and analyzed in this thesis. Fluidization provides a number of benefits, but also presents a different set of obstacles. One of the largest benefits of fluidization …
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Electrochemical conversion of a fluorinated greenhouse gas using a lithium battery configuration
… and LiF under room temperature conditions at an electrode - electrolyte interface. Galvanostatic discharge demonstrated that the reaction between Li and SF 6 is capable of delivering modest cell voltages up to - 2.4 V vs. Li/Lie and capacities up to ~3800 mAh/gc. The electrochemical reaction …
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The “Apparent” Diffusion Coefficient of Electrons Through a Nafion Membrane
… integrity. Using hydrodynamic voltammetry with a rotating disk electrode (RDE), the signals between a bare electrode surface and one modified with a Nafion membrane can be differentiated to observe if there are any discrepancies in the membrane coverage of the electrode.</p> <p>During this work, …
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Electrospun carbon nanofiber electrodes decorated with palladium metal nanoparticles : fabrication and characterization
… investigated to produce a novel oxygen reduction electrode comprised of carbon nanofibers for use in polymer electrolyte membrane (PEM) fuel cells and metal-air batteries. The process involved electrospinning a solution of polymer (polyacrylonitrile), noble metal salt (palladium (II) acetate), and …
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Multiscale modeling of thin film deposition processes
… designed experiments were performed with the rotating disk electrode (RDE) apparatus. A hydrodynamic model was developed for RDE and is used to fit the kinetic parameters that are independent of the transport effect.
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Enhanced performance and durability of shape-controlled octahedral PtNiX catalysts for advanced fuel cell applications
… from liquid half-cell measurements to membrane electrode assembly (MEA) testing. Detailed studies on the morphology, structure, composition, and ORR performance and durability are conducted using techniques like rotating disk electrode (RDE), floating electrode technique (FET), and MEA. Advanced …
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The effect of mass transport on deposit quality in copper electrowinning
<p>"Roughness and nodulation of copper electrodeposits depend strongly on mass transfer conditions of copper ions to the electrode surface. Mass transfer properties in electrowinning electrolytes were first characterized. The effective diffusivity of cupric ion was measured with a rotating disk …
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Gold Nanoshells: Synthesis and Applications to In Situ SERS
… activity and poor uniformity of roughened Au electrodes hinder further applications in the solid-liquid interfacial analysis and Pt-group electrocatalysis for fuel cells. The interaction between Nafion and catalysts are of importance for the fuel cell development, but it has not been …
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Enhancement of Platinum Cathode Catalysis by Addition of Transition Metals
… without Mo. Here, a novel application of the rotating disk electrode was used to study the electrocatalytic activity of relevant electrocatalysts directly on gas diffusion electrodes, indicating an oxygen reduction activity of Pt3 Co/Mo which is slightly better than that of Pt3Co and Pt black. …
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Iridium oxide supported on antimony-doped tin oxide as an electrocatalyst for the oxygen evolution reaction
… electrocatalysts was evaluated using the rotating disk electrode technique. Using X-ray photoelectron spectroscopy (XPS) and high-resolution transmission scanning electron microscopy (HR-STEM), the physical properties of the synthesised IrOₓ/ATO catalysts were elucidated, in order to …
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The design of a microfabricated air electrode for liquid electrolyte fuel cells
In this dissertation, the microfabricated electrode (MFE) concept was applied to the design of an air electrode for liquid electrolyte fuel cells. The catalyst layer of the electrode is envisioned to be fabricated by using a microfabricated die to apply a three-dimensionally patterned macro-texture …
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The Electroreduction of Carbon Dioxide on Porous Copper Nanoparticles
… synthesized by SSM was confirmed with rotating disk electrode experiments (RDE) using cyclic voltammetry at 25°C in CO2 saturated 0.1M potassium bicarbonate solution (KHCO3) at atmospheric pressure. The electrochemical stability of these nanoparticles was tested via bulk electrolysis …
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Anodic Metal Dissolution In Haloaluminate Molten Salts/Ionic Liquids
… chloride (alcl3-etmeimcl) using rotating disk electrode voltammetry. In both cases, at modest overpotentials, the anodization reaction proceeds under mixed kinetic/mass-transport control. However, at larger positive overpotentials and correspondingly higher anodization rates, the …
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