A5031707191- Hydrogen Storage and Materials
- Hybrid Renewable Energy Systems
- Nuclear Materials and Properties
- Ammonia Synthesis and Nitrogen Reduction
- Fuel Cells and Related Materials
- Fusion materials and technologies
- Advanced Chemical Physics Studies
- Catalysts for Methane Reforming
- Catalytic Processes in Materials Science
- Spacecraft and Cryogenic Technologies
- Advanced Battery Technologies Research
- Crystallization and Solubility Studies
- Copper Interconnects and Reliability
- Catalysis and Hydrodesulfurization Studies
- X-ray Diffraction in Crystallography
- Magnetic properties of thin films
- Thermal Expansion and Ionic Conductivity
- Magnetic Properties of Alloys
- Refrigeration and Air Conditioning Technologies
- Electrodeposition and Electroless Coatings
- Heusler alloys: electronic and magnetic properties
- Geothermal Energy Systems and Applications
- Advanced battery technologies research
- Intermetallics and Advanced Alloy Properties
- Soft tissue tumors and treatment
National Institute of Advanced Industrial Science and Technology
2015-2025
Japan Atomic Energy Agency
2012-2024
Tohoku University
2005-2018
Waseda University
2018
Energy Institute
2014
Advanced Institute of Materials Science
2013
Tokyo Women's Medical University
2009
Nara Women's University
1998
Aichi Medical University
1996
Ministry of Economy, Trade and Industry
1993
Hydrogen composition and occupation state provide basic information for understanding various properties of the metal–hydrogen system, ranging from microscopic such as hydrogen diffusion to macroscopic phase stability. Here deuterization process face-centred cubic Fe form solid-solution FeDx is investigated using in situ neutron diffraction at high temperature pressure. In a completely deuterized specimen 988 K 6.3 GPa, deuterium atoms occupy octahedral tetrahedral interstitial sites with an...
Magnetic and half-metallic properties of ${\mathrm{Co}}_{2}({\mathrm{Cr}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x})\mathrm{Ga}$ Heusler alloys have been investigated. In the entire concentration range, $L{2}_{1}$-type ordered phase is obtained. The saturation magnetic moment ${M}_{s}$ at $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ for $x=0.0$ $(\ensuremath{\equiv}{\mathrm{Co}}_{2}\mathrm{Cr}\mathrm{Ga})$ $3.01{\ensuremath{\mu}}_{B}∕\mathrm{f.u.}$, in agreement with generalized Slater-Pauling line...
Considering a vertical cylindrical vessel filled with LaNi5, this study investigated the effect of cyclic hydrogen ab/desorption on swelling pressure, i.e., mechanical pressure exerted by LaNi5 vessel, its packing fraction distribution, and relationship between local fraction. The tended to increase close bottom increasing number cycles. In addition, it converged cycles did not after 20th cycle. bed was denser closer vessel. near increased Almost no developed during first absorption although...
The formation process of perovskite-type hydride LiNiH3 was investigated using in situ synchrotron X-ray diffraction measurements. A mixture LiH and Ni hydrogenated at 873 K 3 GPa, the structural changes associated with hydrogenation were observed. Time-resolved profiles showed a three-step reaction: to NiHx, LiyNi1–yH solid solution, conversion LiNiH3. which has never been reported, plays role precursor perovskite its presence is apparently critical for synthesizing hydrides.
The catalytic functions of Pd are completely modified by alloying with Zn, and PdZn exhibits comparable selectivity to Cu in the steam reforming methanol (SRM). We perform theoretical experimental studies confirm our previous argument that position d -band is a significant factor determining properties. First-principles slab calculations for M –Zn ( = Pd, Ni, Pt) reveal bond breaking on surface leads some reduction -bandwidth, but stable surfaces remains essentially unchanged from bulk....
Li4FeH6, which has the highest gravimetric hydrogen density of iron-containing complex hydrides reported so far, is synthesized by hydrogenation a powder mixture iron and LiH above 6.1 GPa at 900 °C. In situ synchrotron radiation X-ray diffraction measurements reveal that while kinetics require high temperature thus pressure for synthesis, Li4FeH6 expected to be thermodynamically stable slightly below room ambient pressure; further synthetic studies suppress kinetic effects may enable us...
A metallic perovskite-type hydride LiNiH${}_{3}$ was synthesized based on first-principles prediction. We theoretically examined its electronic structure and found that half of the Ni-H derived antibonding states are occupied modest thermodynamic stability depends a delicate balance between (i) destabilization (ii) alleviation compression frustration in corner-sharing octahedra, both which arise from occupation states. Through density-functional analyses lattice instability extending over...
Aluminum-based alloy hydride Al2CuHx (x ∼ 1) is synthesized by hydrogenating Al2Cu using high-temperature and high-pressure hydrogen atmosphere. Al8Cu square antiprisms in twist around the c axis of a tetragonal unit cell hydrogenation. The enlarges interstitial spaces for accommodating atoms which align linearly parallel to Al2CuHx. Thermodynamic stability results from balance stabilization H 1s Al 3sp hybridization destabilization owing Fermi-level lifting upon crystal electronic...
We propose control methods of a photovoltaic (PV)-water electrolyzer (ELY) system that generates hydrogen by controlling the number ELY cells. The advantage this direct coupling between PV and is power loss DC/DC converter avoided. In study, total 15 cells are used. previous researches, temperature was constantly controlled with thermostat. Actually, decided balance electrolysis heat to outside. Here, method investigated. Maximum Power Point Tracking efficiency more than 96% achieved without...