A5053217224- Hydrogen Storage and Materials
- Nuclear Materials and Properties
- Ammonia Synthesis and Nitrogen Reduction
- Hybrid Renewable Energy Systems
- Fuel Cells and Related Materials
- Catalytic Processes in Materials Science
- Advancements in Solid Oxide Fuel Cells
- Metal and Thin Film Mechanics
- Superconducting Materials and Applications
- Solid-state spectroscopy and crystallography
- Carbon Dioxide Capture Technologies
- Crystallography and molecular interactions
- Advanced Data Storage Technologies
- Membrane Separation and Gas Transport
- Global Energy and Sustainability Research
- Phase Change Materials Research
- Refrigeration and Air Conditioning Technologies
- Thermal Expansion and Ionic Conductivity
- Advanced ceramic materials synthesis
- Biofuel production and bioconversion
- Catalysts for Methane Reforming
- Catalysis for Biomass Conversion
- Luminescence Properties of Advanced Materials
- Spacecraft and Cryogenic Technologies
- Metal-Organic Frameworks: Synthesis and Applications
Oak Ridge Institute for Science and Education
2021-2022
Hydrogen and Fuel Cell Technologies Office
2021
Savannah River National Laboratory
2016-2018
Optimal Solutions (United States)
2012-2013
University of Hawaii System
2004-2011
University of Nevada, Las Vegas
2007
Institute for Energy Technology
2006
University of Hawaiʻi at Mānoa
2006
We have studied the structure, energetics, and dynamics of pure Ti-doped sodium alanate $(\mathrm{Na}\mathrm{Al}{\mathrm{H}}_{4})$, focusing on possibility substitutional Ti doping in bulk. Our ab initio calculations reproduce well measured neutron inelastic scattering spectrum, which exhibits surprisingly strong sharp two-phonon features. The also reveal that is energetically possible, imply prefers to substitute for Na a powerful hydrogen attractor facilitates multiple Al-H bond breaking....
Traditional high-pressure mechanical compressors account for over half of the car station’s cost, have insufficient reliability, and are not feasible a large-scale fuel cell market. An alternative technology, employing two-stage, hybrid system based on electrochemical metal hydride compression technologies, represents an excellent to conventional compressors. The stage, operating at 100–875 bar, is thermal system. A techno-economic analysis presented discussed. model was developed,...
A systematic study of the dehydrogenation process undoped and catalyzed NaAlH4 by means anelastic spectroscopy is presented. Evidence reported formation a highly mobile species during decomposition, which has been identified in off-stoichiometric AlH6-x units, giving rise to fast H vacancy local dynamics. The such stoichiometry defects starts at temperatures much lower Ti doped than samples, concomitantly with decomposition reaction. catalyst atoms decrease energy barrier be overcome break...
NaAlH(4) with TiCl(3) and Al were mixed by ball-milling cycled three times. The hydrogen storage properties monitored during cycling, the products characterized synchrotron X-ray diffraction. Because of previously described formation Al(1)(-)(y)Ti(y) y approximately 0.15 cycling that traps beyond amount associated NaCl, some Na(3)AlH(6) has no free to react form NaAlH(4). This was counteracted in present work adding a stoichiometric increases theoretical capacity. Due limitations metal...
Abstract The use of Ti 1.1 CrMn metal hydride material in a thermal hydrogen compression system is investigated. thermodynamic properties the material, initially synthesized and annealed at 900 °C for 48 h (for quantities on order 10 kg), are assessed performing pressure–concentration–temperature equilibrium tests absorption desorption pressure up to about bar. Results show flat plateaus reduced hysteresis. calculated enthalpy entropy 20.55 ± 0.13 kJ <mml:math...
Abstract Hydrogen absorption and desorption isotherms have been measured for several metal hydride alloys identified as possible candidates in the high-pressure (i.e. >80 MPa) stage of a two-stage hydrogen compressor. The were obtained using two independent Sieverts volumetric test systems built specifically measuring parameters from 0.10 to 100 MPa. results enabled us identify alloy Ti 0.8 Zr 0.2 Fe 1.6 V 0.4 most viable investigated use prototype 80+ MPa compressor, it produced highest...
The structural stability of $\mathrm{Na}\mathrm{Al}{\mathrm{H}}_{4}$, a promising hydrogen storage metal hydride system, has been investigated up to $27\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ using in situ synchrotron x-ray diffraction and Raman experiments with diamond anvil cell. Analysis both data indicates pressure-induced phase transition above $14\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ from the ambient $I{4}_{1}∕a$ tetragonal...
A novel alternative to high-pressure mechanical hydrogen compression has been proposed. The technology employs a two-stage, hybrid, thermo-electrochemical system based on electrochemical and metal hydride technologies. technical analysis was performed evaluate the performance of both low-pressure stage (100 bar) (875 bar). several membrane candidate materials evaluated best were identified. model integrated, two-stage developed that found all or most waste heat from can be used fully drive...
Numerical models for the evaluation of cryo-adsorbent based hydrogen (H2) storage systems fuel cell vehicles were developed and validated against experimental data. These simultaneously solve equations adsorbent thermodynamics together with conservation heat, mass, momentum. The also use real gas thermodynamic properties hydrogen. Model predictions compared to data charging discharging both activated carbon MOF-5™ systems. Applications model include detailed finite element analysis...
Global demand for data and access has spurred the rapid growth of center industry. To meet demands, centers must provide uninterrupted service even during loss primary power. Service providers seeking ways to eliminate their carbon footprint are increasingly looking clean sustainable energy solutions, such as hydrogen technologies, alternatives traditional backup generators. In this viewpoint, a survey current state hydrogen-based technologies is provided along with discussion storage...
Traditional high pressure mechanical compressors account for over half of the car station&rsquo;s cost, have insufficient reliability and are not feasible a large-scale fuel cell market. An alternative technology, employing two-stage, hybrid system based on electrochemical metal hydride compression technologies, represents an excellent to conventional compressors. The high-pressure stage, operating at 100-875 bar, is thermal system. A techno-economic analysis presented discussed. model...
Numerical models for the evaluation of cryo-adsorbent based hydrogen storage systems fuel cell vehicles were developed and validated against experimental data. These simultaneously solve conservation equations heat, mass, momentum together with adsorbent thermodynamics. The also use real gas thermodynamic properties hydrogen. Model predictions compared to data charging discharging both MOF-5™ activated carbon systems. Applications model include detailed finite element analysis simulations as...
Over the past decade, several technical developments (such as hydraulic fracturing) have led to an exponential increase in discovering new domestic natural gas reserves. Raw composition can vary substantially from source source. Typically, methane accounts for 75% 95% of total gas, with rest containing ethane, propane, butane, other higher hydrocarbons, and impurities, most common including H2O, CO2, N2, H2S. All requires some treatment, if only remove H2O; however, delivered commercial...