A5070339611- Hydrogen Storage and Materials
- Ammonia Synthesis and Nitrogen Reduction
- Muon and positron interactions and applications
- Rare-earth and actinide compounds
- Nuclear Materials and Properties
- Magnesium Alloys: Properties and Applications
- Magnetic Properties of Alloys
- Hybrid Renewable Energy Systems
- X-ray Diffraction in Crystallography
- MXene and MAX Phase Materials
- Boron and Carbon Nanomaterials Research
- Fusion materials and technologies
- Superconductivity in MgB2 and Alloys
- Metal and Thin Film Mechanics
- Fuel Cells and Related Materials
- High-pressure geophysics and materials
- Crystallography and Radiation Phenomena
- Iron-based superconductors research
- Catalysis and Hydrodesulfurization Studies
- Advancements in Battery Materials
- Inorganic Chemistry and Materials
- Nuclear Physics and Applications
- Gas Sensing Nanomaterials and Sensors
- Magnetic properties of thin films
- Corrosion Behavior and Inhibition
National Institute of Advanced Industrial Science and Technology
2016-2025
Johannes Gutenberg University Mainz
2016
National Energy Technology Laboratory
2014
Center for Nano Science and Technology
2011
Ibaraki University
2011
Osaka University
2002-2008
Materials Science & Engineering
2002
Tokyo Institute of Technology
1997
Abstract Hydrides based on magnesium and intermetallic compounds provide a viable solution to the challenge of energy storage from renewable sources, thanks their ability absorb desorb hydrogen in reversible way with proper tuning pressure temperature conditions. Therefore, they are expected play an important role clean transition deployment as efficient vector. This review, by experts Task 40 ‘Energy Storage Conversion Hydrogen’ Hydrogen Technology Collaboration Programme International...
Abstract Industrial and public interest in hydrogen technologies has risen strongly recently, as is the ideal means for medium to long term energy storage, transport usage combination with renewable green supply. In a future system, production, storage of key technology. Hydrogen will be even more used industrial production processes reduction agent or synthetic hydrocarbons, especially chemical industry refineries. Under certain conditions material based systems compression offer advantages...
An energy-domain 57Fe-Mössbauer spectrometer using synchrotron radiation (SR) with a diamond anvil cell (DAC) has been developed for ultrahigh-pressure measurements. The main optical system consists of single-line pure nuclear Bragg reflection from an oscillating 57FeBO3 single crystal near the Néel temperature and X-ray focusing device. can filter Doppler-shifted narrow bandwidth neV order broadband SR source. focused incident X-rays make it easy to measure small specimen in DAC. present...
Photoinduced phase transitions caused by photochromic reactions bring about a change in the state of matter at constant temperature. Herein, we report photoinduced crystals photoresponsive macrocyclic compound bearing two azobenzene groups (1) room temperature on irradiation with UV (365 nm) and visible (436 light. The trans/trans isomer undergoes (crystal-isotropic phase-crystal) light irradiation. photochemically generated crystal exhibited reversible between mesophase molecular order...
The volumetric hydrogen density of 160 kg H/m3 in TiVCrNbH8 is among the highest for interstitial hydrides, but reported reversible capacity only about 2/3 full theoretical at room temperature. In present work we have investigated local structure TiVCrNbDx, x=0, 2.2, 8 with aim to unravel how remaining sites can be destabilized respect hydrogen/deuterium occupation using total scattering measurements and Reverse Monte Carlo (RMC) modelling. Our analysis indicates that partially desorbed...
Reduction in reversible hydrogen storage capacity with increasing hydrogenation and dehydrogenation cycle number is observed numerous materials, but the mechanism behind this unfavorable change has not been elucidated yet. In study, we have investigated development of structural defects or disorders V1–xTixH2, x = 0, 0.2, 0.5, during first 15 absorption desorption cycles using atomic pair distribution function (PDF) analysis synchrotron X-ray total scattering data to find out possible origin...
A metal to insulator transition in integer or half charge systems can be regarded as crystallization of charges. The insulating state tends have a glassy nature when randomness geometrical frustration exists. We report that the glass is realized perovskite compound PbCrO3, which has been known for almost 50 years, without any obvious inhomogeneity triangular arrangement system. PbCrO3 valence Pb(2+)(0.5)Pb(4+)(0.5)Cr(3+)O3 with Pb(2+)-Pb(4+) correlation length three lattice-spacings at...
Nanostructured metal hydrides could play a key role in hydrogen economy. The nanostructuring or confinement of these materials as, e.g., thin films significantly affects the structural and functional properties. For tantalum hydride, versatile sensing material, we show that as film extends solubility limit by suppressing phase transition observed bulk upon hydrogenation. Different from bulk, body centered cubic unit cell continuously deforms with unequal lattice constants angles between...
Reconstructing the surface nature of metal-organic frameworks (MOFs) as precatalytic structures is a promising methodology for improving electrocatalytic performance. However, regulating structural evolution MOFs during electrolysis remains highly uncontrollable and lacks an in-depth understanding role
Because ammonia borane (AB) exhibits a high hydrogen storage density derived from dihydrogen bonds, it has the potential to be safe, lightweight, and compact material. In tetragonal phase at around room temperature, occupancy is low, atomic arrangement electron distribution have not been clarified. Therefore, properties, including decomposition reaction mechanism, which proceeds ∼373 K, also remain unclear. this study, neutron/X-ray total scattering measurements were performed on AB above...
Interlaboratory comparison of positron annihilation lifetime measurements using synthetic fused silica and polycarbonate was conducted with the participation 12 laboratories. By regulating procedures for measurement data analysis uncertainties lifetimes obtained at different laboratories were significantly reduced in those reported past.
The effect of the rare earth elements and alloy composition on hydrogenation properties crystal structures hydrides in Mg2–xRExNi4 (RE = La, Pr, Nd, Sm, Gd; x 0.6 1.0) was investigated. All alloys had a C15b Laves phase before hydrogenation. Mg1.4RE0.6Ni4 Gd) were hydrogenated through one plateau to form Mg1.4RE0.6Ni4H∼3.6 while maintaining structure. Mg1.0RE1.0Ni4 Nd) ∼1.0 H/M proceeding two plateaus, Sm 0.6–0.7 plateau. initially transformed into Mg1.0RE1.0Ni4H∼4 with an orthorhombic In...
The hydrogen sorption properties of single-phase bcc (TiVNb)100–xCrx alloys (x = 0–35) are reported. All absorb quickly at 25 °C, forming fcc hydrides with storage capacity depending on the Cr content. A thermodynamic destabilization hydride is observed increasing concentration, which agrees well previous compositional machine learning models for metal thermodynamics. steric effect or repulsive interactions between Cr–H might be responsible this behavior. cycling performances TiVNbCr alloy...
The thermal stability of an equilibrium phase may be tuned due to lattice strain and distortion induced by nanosizing. We apply these effects destabilize magnesium hydride, a promising hydrogen storage material owing its high gravimetric density but with too operating temperature/low supply pressure for most practical applications. destabilization is attempted MgH2 in contact entropy alloy (HEA), which multiple metal atoms lead distortion. Here, two HEAs, CrMnFeCoNi face centered cubic (fcc)...