A5059700711- Hydrogen Storage and Materials
- Ammonia Synthesis and Nitrogen Reduction
- Hybrid Renewable Energy Systems
- Magnesium Alloys: Properties and Applications
- Spacecraft and Cryogenic Technologies
- Superconductivity in MgB2 and Alloys
- Nuclear Materials and Properties
- Inorganic Fluorides and Related Compounds
- Superconducting Materials and Applications
- Aluminum Alloys Composites Properties
- Catalysis and Hydrodesulfurization Studies
- Muon and positron interactions and applications
- Catalytic Processes in Materials Science
- Thermodynamic and Structural Properties of Metals and Alloys
- Catalysts for Methane Reforming
- MXene and MAX Phase Materials
- Fusion materials and technologies
- Inorganic Chemistry and Materials
- Conducting polymers and applications
- Powder Metallurgy Techniques and Materials
- Hydrogels: synthesis, properties, applications
- High-Temperature Coating Behaviors
- Magnesium Oxide Properties and Applications
- Catalysis and Oxidation Reactions
- Transition Metal Oxide Nanomaterials
Jeonbuk National University
2015-2024
Chonbuk National University Hospital
2013-2018
Yeungnam University
2016
Milled MgH2, NaAlH4, MgH2–10NaAlH4, MgH2–30NaAlH4, MgH2–50NaAlH4, and MgH2–2Ni-10NaAlH4 samples were prepared by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Decomposition temperatures of milled MgH2–30NaAlH4 examined a Sieverts-type hydrogen-absorption release apparatus, which the pressures kept constant during absorption or release. As content NaAlH4 sample increased, temperature at highest peak ratio increase Hr to T, dHr/dT, versus T curve decreased. The higher is...
In order to investigate the formation of a high pressure form magnesium hydride, γ-MgH2, X-ray diffraction patterns before and after hydriding reaction were obtained for samples MgH2, MgH2 reactive mechanical grinding (RMG), 94 wt% MgH2-6 Ni grinding. addition, absorbed hydrogen quantity versus time curves at first cycle examined. The sample did not contain γ-MgH2. However, RMG contained All these results prove that grinding, one forms was formed in under low pressures.
A metal hydro-borate Zn(BH4)2 was prepared by milling ZnCl2 and NaBH4 in a planetary ball mill an Ar atmosphere. This sample contained NaCl. 95 wt% MgH2-2.5 Zn(BH4)2-2.5 Ni samples [named MgH2-2.5Zn(BH4)2-2.5Ni] were then hydrogen The absorption release properties of the investigated. In particular, variations initial hydriding dehydriding rates with temperature examined. MgH2-2.5Zn(BH4)2-2.5Ni dehydrided at fourth cycle Mg, MgO, small amounts -MgH2 Mg2Ni. after hydriding-dehydriding...
Thermal analysis methods have been used in many reports to determine the activation energy for hydride decomposition (dehydrogenation). In our preceding work, we showed that dehydrogenation rate of Mg-5Ni samples obeyed first-order law, and Kissinger equation could thus be energy. present obtained by applying data from a volumetric method equation. The quantity hydrogen released hydrogenated temperature reactor were measured as function time at different heating rates (Φ) Sieverts-type...
A sample with a composition of 95 wt% Mg-5 TiCl3 (named Mg-5TiCl3) was prepared by reactive mechanical grinding, and its hydriding dehydriding properties were examined. The activation Mg-5TiCl3 not required. had an effective hydrogen-storage capacity about 6.2 wt%. At the first cycle (n=1), absorbed 5.77 H for 5 min, 6.07 10 6.17 30 6.19 60 min at 573 K under 12 bar H2. n=1, desorbed 0.03 2.5 0.13 0.35 1.0 after grinding contained Mg, β-MgH2, γ-MgH2, TiH1.924. XRD pattern dehydrided 4th...
A specimen with a composition of 80 wt% Mg+14 Ni+6 NbF5 (termed Mg-Ni-NbF5) was prepared by mechanical alloying. Its hydrogen absorption and release characteristics were then examined. Mg2NiH4 formed reaction Mg nickel during alloying absorption-release cycling. The particles after cycling became smaller than those owing to the expansion contraction upon cycled Mg-Ni-NbF5 had fairly high rate large storage capacity, an effective capacity close 5.6 at 593 K. absorbed 5.58 H in 12 bar H2...
To improve the hydrogen-storage properties of Mg<sub>2</sub>Ni, LiBH<sub>4</sub> was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg<sub>2</sub>Ni-10LiBH<sub>4</sub> prepared with a composition 90 wt% Mg<sub>2</sub>Ni + 10 LiBH<sub>4</sub>. The quantity released (H<sub>r</sub>) versus temperature T curve for Mg<sub>2</sub>Ni10LiBH<sub>4</sub> obtained...
To improve the hydrogen uptake and release properties of magnesium (Mg), five weight percent graphene was added to pre-milled Mg by milling in (reaction-involving milling). The graphene-added (named Mg-5graphene) were investigated. Pre-milling (for 24 h) then adding 30 min) significantly increased rates quantities absorbed released for 60 min composite. activation Mg-5graphene completed after second uptake-release cycle (n=2). had a high effective hydrogen-storage capacity (quantity 5.47 wt%...
TaF5 and VCl3 were chosen as additives to enhance the hydrogen uptake release rates of Mg. The total content was not more than 10 wt% since too high reduces fraction Mg thus storage capacity alloys. Samples with compositions Mg-x TaF5-x (x=1.25, 2.5, 5) prepared by reactive mechanical grinding. temperatures at which asmilled Mg-xTaF5-xVCl3 began quite rapidly 538, 613, 642 K, respectively. Activation samples needed. In first cycle (n=1), Mg-2.5TaF5-2.5VCl3 had a effective (the amount...