scholarly journals Effects of Ti-Based Additives on the Hydrogen Storage Properties of aLiBH4/CaH2Destabilized System

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Hongwei Yang ◽  
Adeola Ibikunle ◽  
Andrew J. Goudy
Keyword(s):  
Activation Energy ◽  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Hydrogen Capacity ◽  
Desorption Temperature ◽  
Lower Activation ◽  
Storage Properties ◽  
Lower Activation Energy

The hydrogen storage properties of a destabilizedLiBH4/CaH2system ball-milled withTiCl3,TiF3, andTiO2additives have been investigated. It is found that the system withTiCl3additive has a lower dehydrogenation temperature than the ones with other additives. Further study shows that a higher amount ofTiCl3is more effective in reducing the desorption temperature of theLiBH4/CaH2system, since it leads to a lower activation energy of dehydrogenation. The activations energies for mixtures containing 4, 10, and 25 mol% ofTiCl3are 141, 126, and 110 kJ/mol, respectively. However, the benefits of higher amounts ofTiCl3are offset by a larger reduction in hydrogen capacity of the mixtures.

Improved hydrogen storage properties of MgH2 by addition of Co2NiO nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 60983-60989 ◽  
Author(s):  
N. Juahir ◽  
N. S. Mustafa ◽  
A. M. Sinin ◽  
M. Ismail
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Desorption Temperature ◽  
Kinetics Of ◽  
Storage Properties

The result showed that the addition of 10 wt% Co2NiO to the MgH2 exhibits a lower onset desorption temperature. The dehydrogenation and rehydrogenation kinetics of MgH2 + 10 wt% Co2NiO were also improved compared to un-doped MgH2.

Effect of Na3FeF6 catalyst on the hydrogen storage properties of MgH2

2016 ◽  
Vol 45 (16) ◽  
pp. 7085-7093 ◽  
Author(s):  
N. N. Sulaiman ◽  
N. S. Mustafa ◽  
M. Ismail
Keyword(s):  
Activation Energy ◽  
Hydrogen Storage ◽  
Sorption Kinetics ◽  
Hydrogen Storage Properties ◽  
Storage Properties

The MgH2 + 10 wt% Na3FeF6 composite resulted in both a reduced dehydrogenation temperature and enhanced sorption kinetics compared to the undoped MgH2 sample. The activation energy for the decomposition of the as-milled MgH2 was 167.0 kJ mol−1 and this value decreased to 75.0 kJ mol−1 after the addition of 10 wt% Na3FeF6 (a reduction by about 92.0 kJ mol−1).

Excellent catalysis of TiO2 nanosheets with high-surface-energy {001} facets on the hydrogen storage properties of MgH2

Nanoscale ◽  
2019 ◽  
Vol 11 (15) ◽  
pp. 7465-7473 ◽  
Author(s):  
Meng Zhang ◽  
Xuezhang Xiao ◽  
Xinwei Wang ◽  
Man Chen ◽  
Yunhao Lu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Surface Energy ◽  
Hydrogen Storage ◽  
High Surface ◽  
Hydrogen Storage Properties ◽  
System P ◽  
Tio2 Nanosheets ◽  
High Surface Energy ◽  
Storage Properties

Anatase TiO2 nanosheets with exposed {001} facets were used to improve the kinetic performance and reduce the activation energy of MgH2 system.

EFFECT OF TiO2 + Nb2O5 + TiH2 CATALYSTS ON HYDROGEN STORAGE PROPERTIES OF MAGNESIUM HYDRIDE

MRS Advances ◽  
2020 ◽  
Vol 5 (20) ◽  
pp. 1059-1069
Author(s):  
Ntumba Lobo ◽  
Alicja Klimkowicz ◽  
Akito Takasaki
Keyword(s):  
Activation Energy ◽  
Hydrogen Storage ◽  
Niobium Oxide ◽  
Magnesium Hydride ◽  
Kinetic Properties ◽  
Hydrogen Storage Capacity ◽  
Hydrogen Storage Properties ◽  
Kinetics Of ◽  
Storage Properties ◽  
Absorption Of Hydrogen

AbstractMagnesium hydride (MgH2) is a prospective material for the storage of hydrogen in solid materials. It can also be envisaged for thermal energy storage applications since it has the potential to reversibly absorb hydrogen in large quantities, theoretically up to 7.6% by weight. Also, MgH2 is inexpensive, abundant, and environmentally friendly, but it operates at relatively high temperatures, and the kinetics of the hydrogenation process is slow. Mechanical milling and the addition of catalyst can alter the activation energy and the kinetic properties of the MgH2 phase. It is known that the addition of titanium hydride (TiH2) lowers the enthalpy and enhances the absorption of hydrogen from MgH2, titanium oxide (TiO2) enhances the desorption of hydrogen and niobium oxide (Nb2O5) enhances the absorption of hydrogen. In this work, the influences of the catalysts, as mentioned above on the properties of MgH2, were studied. The samples were analyzed in terms of crystal and microstructure as well as hydrogen storage properties using a pressure-composition isotherm (PCT)measurement. It has been found that the simultaneous addition of the three catalysts enhances the properties of MgH2, lowers the activation energy and operating temperature, increases the rate of intake and release of hydrogen, and provides the largest gravimetric hydrogen storage capacity.

scholarly journals Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiantun Huang ◽  
Haizhen Liu ◽  
Xingqing Duan ◽  
Zhiqiang Lan ◽  
Jin Guo
Keyword(s):  
Hydrogen Storage ◽  
Milling Process ◽  
Practical Application ◽  
High Hydrogen ◽  
Hydrogen Storage Properties ◽  
Hydrogen Capacity ◽  
Co Addition ◽  
Storage Properties ◽  
Insight Into

Mg−Li alloy possesses a high hydrogen capacity. However, the hydrogenation and dehydrogenation performances are still far from practical application. In this work, Mg2Si (MS) and graphene (G) were employed together to synergistically improve the hydrogen storage properties of Mg−Li alloy. The structures of the samples were studied by XRD and SEM methods. The hydrogen storage performances of the samples were studied by nonisothermal and isothermal hydrogenation and dehydrogenation, thermal analysis, respectively. It is shown that the onset dehydrogenation temperature of Mg−Li alloy was synergistically reduced from 360°C to 310°C after co-addition of Mg2Si and graphene. At a constant temperature of 325°C, the Mg−Li−MS−G composite can release 2.7 wt.% of hydrogen within 2 h, while only 0.2 wt.% of hydrogen is released for the undoped Mg−Li alloy. The hydrogenation activation energy of the Mg−Li−MS−G composite was calculated to be 86.5 kJ mol−1. Microstructure and hydrogen storage properties studies show that graphene can act as a grinding aid during the ball milling process, which leads to a smaller particle size for the composites. This work demonstrates that coaddition of Mg2Si and graphene can synergistically improve the hydrogen storage properties of Mg−Si alloy and offers an insight into the role of graphene in the Mg−Li−MS−G composite.

Effects of Additional Elements on Hydrogen Storage Properties for Vanadium Alloys

2016 ◽  
Vol 879 ◽  
pp. 885-890
Author(s):  
Atsunori Kamegawa ◽  
Ryoichi Namba ◽  
Masuo Okada
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Content ◽  
Vanadium Alloys ◽  
High Hydrogen ◽  
Hydrogen Storage Properties ◽  
Hydrogen Capacity ◽  
Cr Content ◽  
Cr Addition ◽  
Storage Properties ◽  
Hydride Phases

The effects of effects of additional elements on hydrogen storage properties and crystal structures for vanadium alloys and their hydrides were investigated in order to obtain high hydrogen capacity. With increasing Cr content in V-xCr binary alloys, fully hydrogen content of the alloys slightly decreased until less than 9 at.%Cr. A clear distinction of the PC isotherm curves between the 15 at.%Cr alloy and the other alloys is observed. V alloys with an excessive Cr addition would come not to form gamma hydride (dihydride). This led the drastic decrement of the hydrogen content in the alloys. Meanwhile, the Cr addition in V alloys was effective to low hydrogen concentration in unstabilizing the beta hydride phases. In addition, it was found that the addition of X elements in V-Cr alloys (X=Al. Mo, Ti, W) was effective to expand the gamma-phase forming range of Cr amounts. As the results, high reversible hydrogen-capacity, 2.68mass% H was obtained in a V-18Cr-2Ti-0.5Al alloy.

Achieving superior hydrogen storage properties of MgH2 by the effect of TiFe and carbon nanotubes

2021 ◽  
Vol 422 ◽  
pp. 130101
Author(s):  
Xiong Lu ◽  
Liuting Zhang ◽  
Haijie Yu ◽  
Zhiyu Lu ◽  
Jiahuan He ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Storage Properties
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