X-ray diffraction studies of titanium and zirconium doped NaAlH4: elucidation of doping induced structural changes and their relationship to enhanced hydrogen storage properties

2002 ◽  
Vol 337 (1-2) ◽  
pp. L8-L11 ◽  
Author(s):  
Dalin Sun ◽  
Tetsu Kiyobayashi ◽  
Hiroyuki T. Takeshita ◽  
Nobuhiro Kuriyama ◽  
Craig M. Jensen
Keyword(s):  
Hydrogen Storage ◽  
Structural Changes ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
X Ray ◽  
Storage Properties

Hydrogen storage properties of mechanically alloyedMg–8 mol% LaNi0.5 composite

2004 ◽  
Vol 19 (10) ◽  
pp. 2871-2876 ◽  
Author(s):  
Qian Li ◽  
Qin Lin ◽  
Kuo-Chih Chou ◽  
Li-Jun Jiang ◽  
Feng Zhan
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
X Ray Diffraction ◽  
Equilibrium Pressure ◽  
Hydrogen Storage Properties ◽  
X Ray ◽  
Transmission Electron ◽  
Lower Temperature ◽  
Material Preparation ◽  
Storage Properties

A new nano-ternary Mg–8 mol% LaNi0.5 was prepared by melted and subsequent mechanical alloying technique for hydrogen storage. It was found from our experiments that, this kind of alloy had superior hydriding/dehydriding characteristics in comparison with conventional materials for hydrogen storage. It possessed large hydrogen capacity at a lower temperature, which could absorb 4.55–7.01 mass% H under 3 MPa hydrogen pressure and desorb 4.40–6.90 mass% H under 0.0133 MPa in 600 s above 423 K without any activation requirement drawn from our pressure-composition isotherm and kinetic experiments. Through the x-ray diffraction and transmission electron microscopy experiments, we further found that these superior characteristics could be attributed to the multiphase structure and a catalytic effect of LaH3 and Mg2Ni that were formed in the material preparation of mechanical alloying process. Finally, based on these data the relationships between equilibrium pressure of hydrogen and temperature were obtained, they were lgp(0.1 MPa) = −3985/T + 7.188(553 K ⩽ T ⩽ 573K) for hydriding and lgp(0.1 MPa) = −3804/T + 6.770 (553 K ⩽ T ⩽ 573 K) for dehydriding.

Hydrogen Storage Properties of Mg76Ti12Ni12-xCrX(x=0,3,6,9) Alloys by Mechanical Alloying

2010 ◽  
Vol 156-157 ◽  
pp. 1146-1150
Author(s):  
Zhi Qiang Lan ◽  
Shu Bo Li ◽  
Zhao Lu ◽  
Jin Guo
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Storage Capacity ◽  
X Ray Diffraction ◽  
Hydrogen Storage Capacity ◽  
Hydrogen Storage Properties ◽  
X Ray ◽  
Cr Content ◽  
Ti2ni Phase ◽  
Storage Properties

Mg76Ti12Ni12-xCrx(x=0,3,6,9) alloys were synthesized by mechanical alloying(MA) approach and hydrogen storage properties of the alloys were investigated by X-ray diffraction, thermal analysis and pressure-composition isotherm measurement. It is found that Ti2Ni phase and Mg2Ni phase exist as the main phases in Mg76Ti12Ni12-xCrx(x=0,3,6,9) alloys. The Mg76Ti12Ni12-xCrx(x=0,3,6,9) alloys exhibit the hydrogen storage capacity of 4.61,4.30,4.21 and 4.12wt%, and the decomposition enthalpies of the alloy hydrides are 928.4, 898.3, 831.2 and 851.4J/g H2, respectively. Mg76Ti12Ni6Cr6 alloy shows small hysteresis and fast hydrogen absorption rate. Proper Cr content can improve the performance of the Mg76Ti12Ni12-xCrx(x =0,3,6,9) alloys.

scholarly journals The Influence of Cerium on the Hydrogen Storage Properties of La1-xCexNi5 Alloys

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1437 ◽  
Author(s):  
Magda Pęska ◽  
Julita Dworecka-Wójcik ◽  
Tomasz Płociński ◽  
Marek Polański
Keyword(s):  
Hydrogen Storage ◽  
Structural Changes ◽  
Enthalpies Of Formation ◽  
Two Phase ◽  
Hydrogen Storage Properties ◽  
Cerium Content ◽  
Cooling Conditions ◽  
Lani5 Alloy ◽  
Lattice Shrinkage ◽  
Storage Properties

La1-xCexNi5 alloys (x = 0, 0.09, 0.25 and 0.5) were investigated in terms of their structures, phase contents, hydrogen storage properties and microhardness. It was confirmed that a cerium addition to the reference (LaNi5) alloy caused structural changes such as lattice shrinkage and, as a result, changed both the absorption and desorption pressures and the enthalpies of formation and decomposition. The alloy with the highest cerium content was found to possess a two-phase structure, probably as a result of nonequilibrium cooling conditions during its manufacturing process. The microhardness was found to increase to some extent with the cerium content and decrease for samples with the highest cerium content.

Microwave Synthesis of MOFs/Graphene Oxide Composites and Hydrogen Storage Properties

2016 ◽  
Vol 852 ◽  
pp. 835-840 ◽  
Author(s):  
Tian Bao Yang ◽  
Li Xian Sun ◽  
Fen Xu ◽  
Zi Qiang Wang
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Hydrogen Storage ◽  
Parent Material ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
Transmission Electron ◽  
Metal Organic ◽  
Oxide Composites ◽  
Storage Properties

Metal-organic frameworks (MOFs: copper containing CuBTC)-graphene oxide (GO) composite (CG) was synthesized using microwave heating. The parent material and the composite were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), nitrogen sorption, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (HRTEM) and Raman spectroscopy. Then their hydrogen storage properties were systematically tested. The composite material CG shows a remarkable H2 capacity up to 2.43 wt% (28.6% increases vs. CuBTC) and higher surface area and pore volume compared to the neat CuBTC. And the particle size of CG is down to nanometer scale.

scholarly journals Dehydrogenation/rehydrogenation mechanism in aluminum destabilized lithium borohydride

2009 ◽  
Vol 24 (8) ◽  
pp. 2720-2727 ◽  
Author(s):  
Xuebin Yu ◽  
Guanglin Xia ◽  
Zaiping Guo ◽  
Huakun Liu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Hydrogen Desorption ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Lithium Borohydride ◽  
Hydrogen Storage Properties ◽  
X Ray ◽  
Before And After ◽  
Storage Properties ◽  
Desorption Cycle

LiBH4/Al mixtures with various mol ratios were prepared by ball milling. The hydrogen storage properties of the mixtures were evaluated by differential scanning calorimetry/thermogravimetry analyses coupled with mass spectrometry measurements. The phase compositions and chemical state of elements for the LiBH4/Al mixtures before and after hydrogen desorption and absorption reactions were assessed via powder x-ray diffraction, infrared spectroscopy, and x-ray photoelectron spectroscopy. Dehydrogenation results revealed that LiBH4 could react with Al to form AlB2 and AlLi compounds with a two-step decomposition, resulting in improved dehydrogenation. The rehydrogenation experiments were investigated at 600 °C with various H2 pressure. It was found that intermediate hydride was formed firstly at a low H2 pressure of 30 atm, while LiBH4 could be reformed completely after increasing the pressure to 100 atm. Absorption/desorption cycle results showed that the dehydrogenation temperature increased and the hydrogen capacity degraded with the increase of cycle numbers.

The synthesis and hydrogen storage properties of Mg2Ni substituted with Cu, Co

2009 ◽  
Vol 24 (4) ◽  
pp. 1311-1316 ◽  
Author(s):  
Yu’an Chen ◽  
Hua Huang ◽  
Jie Fu ◽  
Qing Guo ◽  
Fusheng Pan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrogen Absorption ◽  
Energy Dispersive Spectrometry ◽  
Induction Melting ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
X Ray ◽  
Storage Properties ◽  
Scanning Electron

Mg2Ni1-xCux (x = 0, 0.2, 0.4) and Mg2Ni1-yCoy (y = 0, 0.2, 0.4) were successfully synthesized via two steps: induction melting and then ball milling. The component and microstructure of the alloys were determined with x-ray diffraction (XRD) and scanning electron microscopy/x-ray energy-dispersive spectrometry (SEM/XEDS). Mg2Ni phase was observed in all 5 alloys. When the amount of Cu was increased, it led to the formation of phase from Mg2Cu to Cu11Mg10Ni9. Co2Mg was detected in the Co-containing alloys. The hydrogen absorption/desorption properties were tested with p-C-T measurement apparatus, and the results showed that the gaseous storage properties of the alloys were improved by the addition of Cu or Co.

scholarly journals Understanding composition–property relationships in Ti–Cr–V–Mo alloys for optimisation of hydrogen storage in pressurised tanks

2014 ◽  
Vol 16 (31) ◽  
pp. 16563-16572 ◽  
Author(s):  
Samantha K. Callear ◽  
Anibal J. Ramirez-Cuesta ◽  
Kazuya Kamazawa ◽  
Shin-ichi Towata ◽  
Tatsuo Noritake ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Hydrogen Storage ◽  
Powder Diffraction ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Metal Alloys ◽  
Hydrogen Storage Properties ◽  
X Ray ◽  
Composition Property ◽  
Storage Properties

Neutron and X-ray powder diffraction have been used together with inelastic neutron scattering and DFT calculations in order to understand how the composition of two metal alloys can be altered in order to tune their hydrogen storage properties.

Synthesis of MIL-125/Graphene Oxide Composites and Hydrogen Storage Properties

2017 ◽  
Vol 727 ◽  
pp. 683-687 ◽  
Author(s):  
Tian Bao Yang ◽  
Li Xian Sun ◽  
Fen Xu ◽  
Zi Qiang Wang ◽  
Yong Jin Zou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Hydrogen Storage ◽  
Parent Material ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
Transmission Electron ◽  
Metal Organic ◽  
Ft Ir ◽  
Storage Properties

Metal-organic frameworks (MOFs: MIL-125)-graphene oxide (GO) composite (MO) was synthesized by solvothermal method. All the materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy. Then their hydrogen storage properties were systematically tested under 1 bar and 77K. The composite material MO-1 possesses higher surface area than the parent material MIL-125 and shows a remarkable H2 capacity up to 2.5 wt% (38% increases vs. MIL-125).

Hydrogenation Characteristics of Mg Based Alloy Prepared by Super Lamination Technique

2007 ◽  
Vol 561-565 ◽  
pp. 1609-1612 ◽  
Author(s):  
Ryota Mori ◽  
Hiroshi Miyamura ◽  
Shiomi Kikuchi ◽  
Koji Tanaka ◽  
Nobuhiko Takeichi ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Ambient Conditions ◽  
Hydrogen Storage Capacity ◽  
Alloy Films ◽  
Hydrogen Storage Properties ◽  
X Ray ◽  
Ni Alloy ◽  
Initial Activation ◽  
Storage Properties ◽  
Activation Property

In order to improve the hydrogenation property of Mg/Ti laminate composite, Ni was added as a third element. Hydrogen storage properties of the laminated Mg/Ti/Ni alloy films were studied. Laminated Mg/Ti/Ni multilayer alloy films were prepared by cold rolling of stacked Mg, Ti and Ni under ambient conditions. The stacked foils were subjected to repetition of rolling and stacking, resulting in super-laminated foils with the thickness less than 0.3mm, containing more than 15000 layers. Microstructures of the super-laminates were studied by scanning electron microscopy and X-ray diffractometry. Their hydrogenation behaviors were investigated by use of a Sieverts type apparatus. The hydrogen storage capacity (H/M) of the laminate with composition Mg/Ti/Ni=9.0/0.9/0.1 amounted H/M=1.6 at 573K, 0.4MPa. Initial activation property was improved by controlling the amount of Ni appropreately.

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