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Showing 1 to 20 of 44 for “"Metal hydride"”.
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Multi-component ab2 metal hydride alloys for nickel metal hydride battery applications
<p>Compared to the mish metal-based AB<sub>5</sub> MH alloy commonly used in Ni/MH batteries, the transition metal-based AB<sub>2</sub> MH alloy not only reduces the rare earth dependency, it also has higher specific energy. In order to further improve the performance of AB<sub>2</sub> MH alloy, …
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Encapsulation of metal hydride nanoparticles
… and zero carbon energy infrastructures. Alkali metal hydride nanoparticles could provide a route to an efficient lightweight hydrogen storage technology for automotive applications. However, a particular issue with alkali metal hydrides is their sensitivity to air/moisture, making their …
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Thermodynamic properties of metal hydride nanostructures
… gravimetric and volumetric storage capacities of metal hydrides make them ideal hydrogen carriers if the limitations associated with their slow hydrogen release kinetics, their high hydrogen release temperatures, and their poor thermal properties can be resolved. In this thesis, the thermodynamic …
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Group 3 and Group 13 Metal Hydride Compounds
… (and characterize) group 3 and group 13 metal alkyl and hydride complexes. These complexes were supported by aminopyridinato, guanidinato and phenolato ligands. Guanidinato ligand stabilized aluminum alkyl complexes were synthesized through alkane elimination. Aminopyridinato and …
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Metal Hydride Heat Pumps for Thermal Management of Devices
Metal hydrides have very high volumetric energy densities which makes metal hydride heat pumps (MHHPs) particularly efficient devices. Further, a metal hydride heat pump (MHHP) can be tuned to cover a wide range of temperatures. Most phase change materials (PCMs) have a fixed phase change …
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Upscaling effect in the preparation of metal hydride materials
… storage was investigated. In Ti-Zr based AB2 metal hydrides, the effects of composition, microstructure, and hydrogen sorption properties were examined using Scanning electron microscope (SEM), Energy dispersive x-ray spectroscopy (EDS), X-ray diffraction (XRD), and Sievert’s type Pressure …
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Sites and diffusion of muons in FCC metal hydride systems
… due to similarities in spin and charge. For metal hydride systems, the muon enters the sample "as the last hydrogen added," and competes for the same sites as the hydrogen atoms. to observe the site competition and diffusion of both particles (muon and proton), several FCC metal hydrides, …
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Computational Modeling Of High-Performance Nickel-Metal Hydride Battery Materials
… the road worldwide powered primarily by nickel-metal hydride (NiMH) batteries, research into this battery chemistry will improve the hybrid vehicle driving experience, extending electric-only driving ranges while reducing emissions and using less gasoline. The transfer, storage and transport of …
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High Temperature And Pressure Resonant Ultrasound Spectroscopy Study Of Metal Hydride Systems
… characterize the elastic properties of palladium hydride near the tri-critical point as a classic example of metal hydride systems using the resonant ultrasound spectroscopy. A high temperature and high pressure resonant ultrasound spectroscopy system which include the RUS cell and the direct …
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The Investigation of Ca0.6Mm0.4Ni5 for Use in a High Pressure Metal Hydride Hydrogen Compressor
… construction, and testing of a dual stage metal hydride hydrogen compression system intended to be used with lower grade geothermal or waste energy sources. The metal hydrides used in this study were LaNi5 and Ca0.6Mm0.4Ni5. A FTT model was also developed and the model proved useful in …
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Synthesis of Mixed Transition Metal Clusters of Osmium and Rhenium via Metal Hydride Coupling Reactions
The metal hydride coupling reaction, which has been used here to produce mixed metal clusters, is dependent upon the HRe(CO)(,5) unit initially serving as a two-electron donor to the lightly stabilized clusters Os(,3)(CO)(,12-x)S(,x) (S = CH(,3)CN, C(,8)H(,14); x = 1 or 2). From this point, all …
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Encapsulated metal hydride and carbon particles in polymeric matrix- an approach to enhances hydrogen storage properties of metal hydrides
… all solid-state hydrogen storage materials, metal hydrides have the highest density for hydrogen storage in order to meet storage demand. Chapter-2 discussed about A Critical Review on Improving Hydrogen Storage Properties of Metal Hydride via Nanostructuring and Integrating Carbon Particles. …
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Neutronic-Thermal Simulation of Micro Reactor Designs for the Purpose of Analyzing the Impact of Thermal Expansion and Hydrogen Migration in Metal Hydride Moderator
… this, by adding thermal expansion and zirconium hydride-based hydrogen diffusion to the neutronic-thermal simulation of multiple heat pipe microreactor designs. Microreactors’ smaller cores are inherently characterized by more leakage than gigawatt-scale reactor cores. The inclusion of thermal …
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Development of a Hydrogen Producing Thermal Control for Chemical Hydrogen Storage
… of the storage system was improved using a metal hydride system to act as a thermal control unit for an exothermic chemical hydrogen storage system. A cylindrical shaped “hybrid” reactor was created to allow hydrogen production from a sodium borohydride packed bed reactor and the metal …
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Thermodynamics of metal hydrides for hydrogen storage applications using first principles calculations
Metal hydrides are promising candidates for H2 storage, but high stability and poor kinetics are the important challenges which have to be solved for vehicular applications. Most of recent experimental reports for improving thermodynamics of metal hydrides have been focused on lowering reaction …
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Ligand participation in energy storage electrocatalysis and photocatalysis
… from acid. Rather than forming a traditional metal-hydride intermediate, nickel porphyrins are found to be protonated on the macrocycle ligand to first form a phlorin intermediate and ultimately a doubly-hydrogenated isobacteriochlorin species. The Ni isobacteriochlorin serves as the active …
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Synthesis and reactivity of early transition metal "Frustrated Lewis Pairs"
… thesis we demonstrate that Lewis acidic early metal cations can activate small molecules in the presence of sterically demanding donors to exhibit unique reactivity. The cationic Lewis acids [Cp2Zr(O't'Bu)] +, [Cp2Zr(OPh)]+, [Cp2Zr(OMes)] + and [Cp2Zr(ODipp)]+ are generated by the reaction …
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Electron Transfer and Other Reactions Using Atomic Metal Anions
The atomic metal anions Rb-, Cs-, Cu-, Ag- and Fe- have been generated in the gas phase and reacted with various neutral reactants in a triple quadrupole mass spectrometer. The metal anions were formed via electrospray ionization of the metal-oxalate solutions and form in gas phase between the …
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