Effect of Ti Content on Hydrogen Storage Properties of Amorphous MgNi Alloy

2010 ◽  
Vol 650 ◽  
pp. 234-238
Author(s):  
Shan Gao ◽  
Jing Feng Wang ◽  
Pei Dao Ding ◽  
Fu Sheng Pan ◽  
Ai Tao Tang
Keyword(s):  
Amorphous Phase ◽  
Discharge Capacity ◽  
Cycle Stability ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
Ni Alloys ◽  
Discharge Capacities ◽  
Ti Content ◽  
Maximal Discharge ◽  
Storage Properties

Cycle capacities of Amorphous Mg-Ni alloys declined so fast therefore they can’t be used practically. In this paper，the influence of adding Ti on the discharge capacity and cycle stability of the alloys were investigated. Amorphous Mg1-xTixNi (x=0, 0.1, 0.2, 0.3) alloy powder was prepared successfully by mechanical alloying (MA). X-ray diffraction (XRD) results show that MgNi alloy formed completely amorphous phase after ball milling with 15h. But for Mg1-xTixNi (x=0.1, 0.2, 0.3) alloy, it took 23h. It can be concluded that Ti partial substituting Mg would decrease the amorphous phase forming ability of Mg-Ni based alloy. Compared with amorphous MgNi alloy, the maximal discharge capacities of Mg1-xTixNi (x=0.1, 0.2, 0.3) alloy were decreased slightly, but the cycle stabilities were significantly enhanced. Mg0.9Ti0.1Ni alloy showed the largest discharge capacity and the best cycle stability.

Effect of Al Content on Hydrogen Storage Properties of Amorphous Mg1-xAlxNi (x=0, 0.1, 0.2, 0.3) Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 946-950
Author(s):  
Jing Feng Wang ◽  
Pei Dao Ding ◽  
Shan Gao ◽  
Fu Sheng Pan ◽  
Ai Tao Tang
Keyword(s):  
Hydrogen Storage ◽  
Amorphous Phase ◽  
Discharge Capacity ◽  
Cycle Stability ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
Al Content ◽  
Synthesis Properties ◽  
Discharge Capacities ◽  
Storage Properties

In this paper，the influence of adding Al on the discharge capacity and cycle stability of amorphous MgNi-based hydrogen storage alloys were investigated. Amorphous Mg1-xAlxNi (x=0, 0.1, 0.2, 0.3) alloy powder was prepared successfully by mechanical alloying (MA). X-ray diffraction (XRD) results show that after ball milling with 15h, MgNi alloy formed completely amorphous phase. But for Mg1-xAlxNi (x=0.1, 0.2, 0.3) alloy, it took 30h. It can be concluded that Al partial substituting Mg would decrease the amorphous phase forming ability of Mg-Ni Based Alloy. The discharge capacities and cycle stabilities of these alloys were tested. Compared with amorphous MgNi alloy, the discharge capacities of Mg1-xAlxNi (x=0.1, 0.2, 0.3) alloy were decreased slightly, but the cycle stabilities were significantly enhanced. Mg0.9Al0.1Ni alloy showed the largest discharge capacity and Mg0.8Al0.2Ni alloy showed the best cycle stability. Over all, ternary Mg0.8Al0.1Ni alloy showed the best synthesis properties.

Hydrogen storage properties of Ti2−xCrVMx (M = Fe, Co, Ni) alloys

2013 ◽  
Vol 38 (30) ◽  
pp. 13335-13342 ◽  
Author(s):  
Asheesh Kumar ◽  
Seemita Banerjee ◽  
C.G.S. Pillai ◽  
S.R. Bharadwaj
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Ni Alloys ◽  
Storage Properties

Mechanism of Improved Hydrogen Absorption Kinetics in Cast Mg-Ni Alloys

2009 ◽  
Vol 618-619 ◽  
pp. 391-394 ◽  
Author(s):  
Kazuhiro Nogita ◽  
Sean Ockert ◽  
Andrew Duguid ◽  
Jordan Pierce ◽  
Matthew Greaves
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Absorption ◽  
Atomic Scale ◽  
Desorption Kinetics ◽  
Eutectic Alloys ◽  
Atmospheric Conditions ◽  
Hydrogen Storage Properties ◽  
Ni Alloys ◽  
Slow Kinetics ◽  
Storage Properties

The potential for Mg and Mg-Ni alloys to be used as hydrogen storage alloys has been known for some time. Although the maximum storage capacity in these alloys is high (7.6wt%H2 for Mg and 3.4wt%H2 for Mg2Ni), they have, until recently, been disregarded for practical applications due to their slow kinetics and high reaction temperatures. This paper discusses the recent discovery that the non-faceted/faceted hypo-eutectic Mg-Mg2Ni system can, similar to Al-Si eutectic alloys, be modified by trace additions and that this results in improved hydrogen storage properties. The hydrogen storage properties depend on the composition, including trace levels of modifying elements, and processing conditions. In alloys of optimal composition it has been shown that the reversible storage of 6.5-7wt% H2 is possible at a rate of reaction that is far better than that previously documented. In addition, the alloy can be satisfactorily processed in air, as opposed to controlled atmospheric conditions. This paper discusses the mechanism of improved hydrogen absorption/desorption kinetics when eutectic Mg-Ni hypo-eutectic alloys are modified. This discussion is based on atomic scale analysis using electron microscopy and examination with synchrotron radiation.

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.

Preparation and Hydrogen Storage Properties of Mg-Ni-B BCC Alloys

2007 ◽  
Vol 561-565 ◽  
pp. 1625-1628 ◽  
Author(s):  
Huai Yu Shao ◽  
Kohta Asano ◽  
Hirotoshi Enoki ◽  
Etsuo Akiba
Keyword(s):  
Absorption Capacity ◽  
Nanometer Scale ◽  
Activation Process ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
Transmission Electron ◽  
Two Samples ◽  
Bcc Structure ◽  
Diffraction Patterns ◽  
Storage Properties

Mg-Ni-B system alloys were prepared by the mechanical alloying (MA) method. Body centered cubic (BCC) structure alloys are obtained in some of the Mg-Ni-B compositions after the starting mixtures of raw elements were ball milled for 200 h. Mg50Ni45B5 and Mg48Ni48B4 alloys after ball milling are with single BCC structure, which is confirmed by electron diffraction patterns. From the results of X-ray diffraction and transmission electron microscope, the crystallite size of the alloys is calculated into nanometer scale. Mg50Ni45B5 and Mg48Ni48B4 BCC alloys can absorb hydrogen at 373 K with higher rate than Mg50Ni50 alloy prepared in the same conditions. And these two samples can reach a hydrogen absorption capacity of 1.94 and 1.93 mass%, respectively at 373 K without any activation process.

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.

Effect of Ti content on the hydrogen storage properties of Zr1−x Ti x Mn2Ce0.015 alloys

Rare Metals ◽  
2010 ◽  
Vol 29 (6) ◽  
pp. 589-592 ◽  
Author(s):  
Yali Ji ◽  
Xiaopeng Liu ◽  
Jing Mi ◽  
Xiumei Guo ◽  
Zhinian Li ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Ti Content ◽  
Storage Properties
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