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Showing 1 to 20 of 33 for “"metal hydrides"”.
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Electrochemical energy conversion using metal hydrides hydrogen storage materials
Metal hydrides hydrogen storage materials have the ability to reversibly absorb and release large amounts of hydrogen at low temperature and pressure. In this study, metal hydride materials employed as negative electrodes in Ni-MH batteries are investigated. Attention is on AB5 alloys due to their …
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D2 and H2 interactions with chemically reactive metal hydrides
… of chemically reactive nanoparticle metal hydrides with hydrogen gas. A consistent behavior of a net anomalous heat release has been seen. With consultation from peers and comparison to similar experiments by a Japanese research group called Technova, there has been an effort to …
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Development of metallic catalysts for hydrogen production from metal hydrides
… Una soluzione acquosa stabilizzata di idruro di metallo è considerata una fonte ideale di idrogeno puro per le applicazioni in celle a combustibile. In particolare, NaBH4 rappresenta l'idruro migliore a causa della sua elevata capacità di stoccaggio di idrogeno (10,8% in peso). Inoltre, il …
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Alkane Elimination Reactions between Transition Metal Hydrides and Rare-Earth Alkyls
In the present work various transition metal hydrides were examined regarding their potential to form unsupported bonds towards rare-earth metals. Selected rare-earth alkyls were reacted with the metal hydrides in question. Motivated by previous results of the Kempe group in which the alkane …
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Recovery Of Hydrogen And Helium From Their Mixtures Using Metal Hydrides
… of these gases will have an economic benefit. Metals, alloys, and intermetallics are known to react with hydrogen in favorable conditions; therefore, they have the possibility of serving as separating and recovery agents. In this study, Mg2Ni, VTiNi and LaNi5 were studied for the separation of …
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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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Characterization of nano-scaled metal-hydrides confined in nano-porous carbon frameworks
"Metal hydrides are currently being studied to provide hydrogen for use in fuel cells and for transportation applications. Hydrogen can be stored in chemical compounds at higher density and lower volume than liquid H₂ or compressed gas. Thermodynamic properties of metal hydrides differ between bulk …
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Hydrogen Distribution in Metal Hydrides and its Effect on Reactor Physics Calculations
… scattering is explored, as it pertains to metal hydrides. Exciting and de-exciting vibrations corresponds to energy change, where a neutron may deposit energy into the material, thus inciting a vibration (phonon), or gain energy by destroying a phonon. This change in energy specifies …
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Direct 3D and in situ characterization of light metal hydrides for hydrogen storage
… in realizing a hydrogen energy economy. Light metal hydrides possess high storage capacities, but sluggish hydrogen uptake and release kinetics hinder their practical use. Significant improvements in the kinetics of these materials have been achieved with catalytic additives in conjunction with …
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I. Radical Cyclizations Mediated by Transition Metal Hydrides II. Study toward the Total Synthesis of Pluraflavin A III. Cytoprotective Polyacetylenes Inspired by Panaxytriol
… radical cyclizations mediated by transition metal hydrides. CpCr(CO)₃H and (H₂O)₂Co(dmgBF₂)₂ under H₂ gas catalyzed the radical cyclization of 1,6-dienes to form 5- and 6-membered rings and the cyclization of a 1,6,11 triene to form a substituted decalin. Vanadium hydrides of the general …
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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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Solid State Studies of [ReH9]-2 Complexes from Ambient to Extreme Conditions: High Volumetric Capacity Hydrogen Storage
… to energy system. Solid state transition metal hydrides based on Re and transition metals are very attractive materials for hydrogen and energy storage due to their large volumetric capacity, providing a safe and efficient way of storing hydrogen. The [ReH9]-2 ion continues to captivate …
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ORGANOMETALLIC CHEMISTRY FROM THE INTERACTING QUANTUM ATOM APPROACH
… was implemented allowing the study of transition metal compounds with this techniques. Furthermore IQA concepts were joined with Ponèc’s DAFH (Domain Avaraged Fermi Hole) giving the so-called IQA-EDF-DAFH analysis (EDF= electron-number distribution function) which provide a complete description …
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Stability and superconductivity of light-atom systems under extreme pressure
… hydrogen and experimentally verified in numerous metal hydrides. This thesis adds to the knowledge of these high-pressure light-atom systems and introduces new tools for predicting their superconducting properties. It showcases the calculation of an anharmonic phase diagram of solid hydrogen, …
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High Temperature And Pressure Resonant Ultrasound Spectroscopy Study Of Metal Hydride Systems
… 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 contact transducer set-up was designed and constructed. The …
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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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A Design Tool For The Evaluation Of Atmosphere Independent Propulsion In Submarines
… pure hydrogen, stored cryogenically or in metal hydrides, or more common fuels such as diesel or methanol, used either directly or in a reformed state. Oxidants include pure oxygen, stored cryogenically or in compressed form. as well as hydrogen peroxide and sodium perchlorate. Energy …
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Mixed anion complex hydrides for hydrogen storage
… structures of three amide-borohydride complex hydrides of lithium and sodium, Li\(_4\)BH\(_4\)(NH\(_2\))\(_3\), Li\(_2\)BH\(_4\)NH\(_2\) and Na\(_2\)BH\(_4\)NH\(_2\), have been solved by powder diffraction methods and characterised by infrared and Raman spectroscopy. The thermal decomposition …
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