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Showing 1 to 20 of 34 for “"vanadium oxide"”.
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Electrodeposited macroporous vanadium oxide Li-ion battery materials
… on the electrodeposition of 3D macroporous vanadium oxide inverse opals and binary inverse opals on transparent conducting oxide substrates and stainless steel and thermally oxidized stainless-steel substrates. The electrodeposition follows a diffusion limited growth mode to form 3D porous …
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Vanadium Oxide Microbolometers with Patterned Gold Black or Plasmonic Resonant Absorbers
… coatings. The device utilizes a gold-doped vanadium oxide film in a standard air bridge design. Performance estimations are calculated from current theory, and efforts to maximize signal to noise ratio are shown and evaluated. Most notably, presented are the experimental results and analysis …
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High resolution spectroscopy of the Vanadium oxide B⁴ [pi] -X⁴ [sigma] ⁻ (0,0) Band
The B⁴Π—X⁴Σ⁻ (0,0) band of VO has been recorded at sub-Doppler resolution by intermodulated fluorescence spectroscopy. Spectral linewidths of 60 MHz were typical; which enabled the hyperfine structure due to the ⁵¹V nucleus (I = 7/2) to be resolved for most of the observed branches. The hyperfine …
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Impact of Structure and Defect Modification on Vanadium Oxide for Alkali-ion Battery Electrodes
… should be a top priority. Within this context, vanadium oxide is an ideally suited model material showcasing how structural or chemical alterations can have tremendous impact on device performance. As a means towards improving electrochemical performance, the role of kinetics and thermodynamics …
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Kinetics of Methyl Ketone and Levulinic Acid Oxidative Scission Over Supported Vanadium Oxide Catalysts
… a-carbon oxidative scission over supported vanadium oxide catalysts. However, the high selectivity of methyl scission during LA oxidation appears to be unexpected according to the trends observed during the analogous oxidative scission of methyl ketones (e.g., 2-butanone and 2-pentanone). …
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Microstructural effects on capacity-rate performance of vanadium oxide cathodes in lithium-ion batteries
Vanadium oxide thin film cathodes were analyzed to determine whether smaller average grain size and/or a narrower average grain size distribution affects the capacity-rate performance in lithium-ion batteries. Vanadium oxide thin films were prepared by sputtering onto ITO-coated glass substrates …
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Structural changes and dynamic behaviour of vanadium oxide-based catalysts for gas-phase selective oxidations
… for the synthesis of important chemicals used vanadium oxide-based catalysts. These catalytic systems are used either in the form of multicomponent mixed oxides and oxysalts, e.g., in the oxidation of n-butane (V/P/O) and of benzene (supported V/Mo/O) to maleic anhydride, or in the form of …
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Electronic properties and surface chemistry of vanadium oxide systems: New insights from synchrotron X-ray techniques
Vanadium oxides are considered exemplary materials within both fundamental condensed matter physics and heterogeneous catalysis research. The metal-insulator transition (MIT) inVO2 has been at the centre of attempts to understand the role of electron correlations in transition metal oxides since …
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Gas Phase Oxidation of Levulinic Acid for the Production of Maleic Anhydride over Supported Vanadium Oxide Catalysts
… This process is carried out over supported vanadium oxide catalysts. Yields as high as 71% of the theoretical maximum were achieved at 573 K over a vanadium oxide catalyst supported on SiO2. The exact mechanism underlying this transformation is complex, but our results suggest that maleic …
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Functionalization and Dispersion Stability Study of Graphene Materials in 2K Urethane Coating System and Expanded Interlayer Spacing of Vanadium Oxide Nanomaterials for Energy Storage Applications
… observing their effects on corrosion protection. Vanadium oxide nanofibers and nanoflowers were also synthesized with increased interlayer, or d-spacing. During synthesis we observed the effects the concentration of surfactant (SDBS) and cobaltocenium hexafluorophosphate has on the ability to …
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Exploration of basis set issues for calculation of intermolecular interactions and density functional theory calculations of vanadium oxide clusters and their reactions with sulfur dioxide
… and augmentation approaches to be reliable. Vanadium oxide is a catalytic system that plays an important role in the conversion of sulfur dioxide to sulfur trioxide. Density functional theory is employed to study structure and stability of small neutral vanadium oxide clusters in the gas …
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The influence of molybdenum and vanadium on the activity and selectivity of a cobalt Fischer-Tropsch catalyst
… on CO hydrogenation indicates that molybdenum oxide and vanadium oxide used as a promoter may be beneficial for the activity and selectivity of a cobalt based catalyst. To eliminate the structural influence on the selectivity by using commercial MoO3 and V2O5 supports, and alumina support was …
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Physics-Based Li-Svo Cathode Model
… model for a St. Jude Medical fabricated silver vanadium oxide (SVO) cathode coin cell battery was constructed. The model is based on a single particle Fick's second law approach with the open-circuit potential modeled with a Redlich-Kister equation. By assuming that lithium ions intercalate only …
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Analysis of Kyrock for Leaching of Impurities in Synthetic Rainwater
… showed inorganic compounds such as titanium oxide, vanadium oxide along with traces of arsenic. Elemental analysis of samples indicates a percent of carbon, and sulfur with no notable traces of nitrogen. Pyrolysis of the samples was done using gas chromatography mass spectroscopy with a …
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Physical, electrical and electrochemical characterizations of transition metal compounds for electrochemical energy storage
… cation insertion into a nanostructured vanadium oxide, a promising electrode material candidate, for the alkali metal ions Li+, Na+ and K+ and the organic ammonium ion, in aqueous electrolyte solutions. Observed are the distinctive insertion processes of the different ions, which yield a …
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Composite cathodes for lithium rechargeable batteries
… utility of incorporating continuous, nanoscale vanadium oxide phases within preferred domains of self-organizing copolymers was investigated towards the fabrication of composite, nanoarchitectured electrode materials for solid-state rechargeable batteries. In situ growth of cathodic phases …
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The Development of High-Throughput and Miniaturized Differential Scanning Calorimeter for Thermodynamic Study of Bio-Molecules
… (PI) thin film. Highly temperature sensitive vanadium oxide was used as the thermistor material. A PDMS (Polydimethylsiloxane) microfluidic chamber was separately fabricated and then bonded firmly with the PI substrate by a stamp-and-stick method. Meanwhile, the micro heater design was …
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Synthesis, structure, and reactivity of polyoxovanadates in nonaqueous media
… normally associated with those present on solid vanadium oxide surfaces. The first species isolated from this reaction was $\rm H\sb2V\sb{10}O\sb{28}\sp{4-}$ as a TBA salt, structural characterization in the solid and solution state reveal that the protonation sites are two OV$\sb2$ oxygens. This …
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Investigation of thermal electric cooler-less microbolometer infrared imaging
… is an array of microbolometers which are small vanadium oxide elements whose resistances are very sensitive to IR radiation. The ability to run an imaging module without the TEC results in significant reduction in FPA package size, power consumption and module costs. In order to run a module in …
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Solid Phase Crystallization of Vanadium Dioxide Thin Films and Characterization Through Scanning Electron Microscopy
Crystalline films of vanadium dioxide were obtained through thermal annealing of amorphous vanadium dioxide thin films sputtered on silicon dioxide. An annealing process was found that yielded polycrystalline vanadium dioxide thin films, semi-continuous thin films, and films of isolated single-crystal …
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