A5069537960- Hydrogen Storage and Materials
- Ammonia Synthesis and Nitrogen Reduction
- Hybrid Renewable Energy Systems
- Superconductivity in MgB2 and Alloys
- Advanced Battery Materials and Technologies
- Spacecraft and Cryogenic Technologies
- Fusion materials and technologies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Quantum, superfluid, helium dynamics
- High Entropy Alloys Studies
- Inorganic Chemistry and Materials
- Advancements in Battery Materials
- Catalytic Processes in Materials Science
- High-Temperature Coating Behaviors
- Nuclear Materials and Properties
- Advanced Chemical Physics Studies
- Crystallography and molecular interactions
- Inorganic Fluorides and Related Compounds
- MXene and MAX Phase Materials
- Graphite, nuclear technology, radiation studies
- Advanced materials and composites
- Additive Manufacturing Materials and Processes
- Combustion and Detonation Processes
- Muon and positron interactions and applications
Hokkaido University
2016-2025
Sapporo Science Center
2014-2020
Curtin University
2018
Universidad Nacional Autónoma de México
2018
Engineering (Italy)
2016
Faculty (United Kingdom)
2016
National Institute of Advanced Industrial Science and Technology
2015
Creative Research
2014-2015
Hiroshima University
2003-2013
Institute for Energy Technology
2013
We have investigated the hydrogen storage properties of a ball-milled mixture 3Mg(NH2)2 and 8LiH after first synthesizing Mg(NH2)2 by ball milling MgH2 under an atmosphere NH3 gas at room temperature. The thermal desorption mass spectra without any catalysts indicated that large amount (∼7 wt %) was desorbed from 140 °C, peaked ∼190 °C heating rate 5 °C/min with almost no ammonia emission. Moreover, reversibility absorption/desorption reactions confirmed to be complete. above results...
The mechanism of the hydrogen desorption (HD) reaction from 1:1 mixture lithium amide (LiNH2) and hydride (LiH) to imide (Li2NH) (H2) has been proposed on basis our experimental results in this paper. model is constituted by 2 kinds elementary reactions: one that 2LiNH2 decomposes Li2NH ammonia (NH3), other emitted NH3 reacts with LiH transforms into LiNH2 H2. Since former latter reactions are, respectively, endothermic exothermic, HD corresponding occurs as soon decomposed NH3. Therefore,...
The state of Nb-contained catalysts in MgH2 nanocomposites was investigated during the full cycle. X-ray diffraction (XRD) results showed that Nb2O5 and Nb reacted with ball-milling, forming NbH2 NbH, respectively. In following dehydrogenation, (di)hydride decomposed, produced. Then NbH generated both samples after rehydrogenation. Similar composition suggests catalytic effect follows same mechanism, Nb-gateway model, which facilitates hydrogen transportation from to outside. By contrast,...
In this paper, we review our recent experimental results on hydrogen storage properties of light elements Li, C and Mg based nano-composite materials. The are summarized as follows: the Li-N-H system, such ball milled 1:1 mixture Li amide hydride containing a small amount TiCl3 (1 mol%), large (∼6 mass%) is absorbed desorbed in temperature range from 150 to 250°C with good reversibility high reaction rate. Furthermore, 3Mg(NH2)2 8LiH, ∼7 mass% reversibly stored 140 220°C, indicating one...
A valence state and a local structure of transition metals (Nb, V, Ti) in MgH2 doped with metal oxides (Nb2O5, V2O5, TiO2nano) by ball milling were examined X-ray absorption spectroscopy (XAS). The main edge regions the Nb, Ti K-edges near (XANES) profiles are located between 0 +5 oxidation states. Since these spectra coincide those NbO, VO, Ti2O3, respectively, additives reduced to oxides, which have lower states than starting materials. Furthermore, order examine structures around atoms,...
The hydrogen desorption mechanism in the reaction from LiH + LiNH2 to Li2NH H2 was examined by thermal mass spectrometry, thermogravimetric analysis, and Fourier transform IR analyses for products replaced LiD or LiND2 LiNH2, respectively. results obtained indicate that proceeds through following two-step elementary reactions mediated ammonia: 2LiNH2 --> NH3 H2, where molecules are randomly formed four equivalent atoms a hypothetical LiNH4 produced between according laws of probability.
A hydrogen storage ability caused by the interaction between nanostructured carbon (CnanoHx) and lithium hydride (LiH) is demonstrated, which should be recognized as Li-C-H system in H-storage materials. Especially, 2:1 mixture of CnanoHx LiH exhibited promising properties with a rechargeable capacity more than 4 mass% below 350 °C, preserving nanostructural feature even after release. On other hand, 1:2 1:1 mixtures crystal growth Li2C2 desorption, leading to poorer rechargeability.
It is reported for the first time, that desorption properties in complex metal hydrides (MgH<sub>2</sub>, LiAlH<sub>4</sub>, and LiNH<sub>2</sub>) are enhanced by a lithium-ion-battery material, LiTi<sub>2</sub>O<sub>4</sub>. Three different systems hydrogen storage catalysed one material.
Lithium hydride has high hydrogen capacity (12.7 mass %), but could not be considered as practical storage media because of being very stable (required 900 °C for 0.1 MPa desorption pressure). Recently, C and Si have been found suitable to reduce the stability LiH. This motivates us investigate properties other alloys Li, formed with elements. In present work, Li3.75Ge (Li15Ge4) alloy was synthesized by mechanical milling, which transformed into Li4.2Ge (Li21.1875Ge5) Li3.5Ge (Li7Ge2) phases...
Decomposable polymer was used for low temperature sintering of Cu fine particles conductive films.