scholarly journals Enhanced hydrogen storage properties of a dual-cation (Li+, Mg2+) borohydride and its dehydrogenation mechanism

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 36852-36859 ◽  
Author(s):  
Liuting Zhang ◽  
Jiaguang Zheng ◽  
Xuezhang Xiao ◽  
Xiulin Fan ◽  
Xu Huang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Kinetics Of ◽  
Dehydrogenation Mechanism ◽  
Storage Properties

The dehydrogenation temperature and kinetics of LiBH4 could be significantly modified by altering the χp of Li ions.

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.

The effect of Sr(OH)2 on the hydrogen storage properties of the Mg(NH2)2–2LiH system

2017 ◽  
Vol 19 (12) ◽  
pp. 8457-8464 ◽  
Author(s):  
Hujun Cao ◽  
Han Wang ◽  
Claudio Pistidda ◽  
Chiara Milanese ◽  
Weijin Zhang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Thermodynamics And Kinetics ◽  
System P ◽  
Kinetics Of ◽  
Storage Properties

Sr(OH)2 influences both the thermodynamics and kinetics of the Mg(NH2)2–2LiH system, lowering the dehydrogenation onset and peak temperatures by ca. 70 °C and 13 °C.

scholarly journals The hydrogen storage properties of MgH2–Fe7S8 composites

2021 ◽  
Author(s):  
Ying Cheng ◽  
Jia Bi ◽  
Wei Zhang
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Highly Efficient ◽  
Kinetics Of ◽  
Storage Properties

A highly efficient, safe, and non-toxic polysulfide material (Fe7S8) can remarkably enhance the kinetics of MgH2.

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.

Phase Structure and Hydrogen Storage Characterization of the As-Cast Mg-10Ni-2Mm Alloy

2010 ◽  
Vol 650 ◽  
pp. 150-156 ◽  
Author(s):  
N. Xing ◽  
P.C. Bai ◽  
Ying Wu ◽  
Z.C. Lu ◽  
W. Han ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Absorption ◽  
Absorption Capacity ◽  
Desorption Kinetics ◽  
Isothermal Temperature ◽  
Hydrogen Storage Properties ◽  
Metallic Particles ◽  
Kinetics Of ◽  
Storage Properties

The microstructural revolution of non-hydrogenated and hydrogenated Mg-based Mg-10Ni-2Mm alloy was studied. PCT and H-absorption/desorption kinetics were performed to evaluate the hydrogen storage properties. Storage capacities of 4.75, 5.03 and 5.27wt.%H for the alloy were obtained at 300, 325 and 350°C, respectively. The phases in the hydrogenated samples are mainly MgH2 and Mg2NiH4. Two absorption/desorption plateau existed in the PCT curves at each isothermal temperature. The values of ΔH and ΔS of the Mg2NiH4-formation was respectively -61.5 kJ/mol H2 and -118.6 J/mol H2 K which is lower compared with literature values. The kinetics of the H-absorption/desorption reactions for the alloy was improved by increasing the temperature. The alloy at 350°C showed the best kinetics performance of the H-absorption/desorption among the three temperatures. It is suggested that metallic particles and Mm may be mainly responsible for the improvement of the H-absorption/desorption kinetics, and Ni for the enhancement of hydrogen absorption capacity of the alloys.

scholarly journals Catalytic Effect of Facile Synthesized TiH1.971 Nanoparticles on the Hydrogen Storage Properties of MgH2

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1370 ◽  
Author(s):  
Zhang ◽  
Lu ◽  
Ji ◽  
Yan ◽  
Sun ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Catalytic Effect ◽  
Catalyst Concentration ◽  
Hydrogen Storage Properties ◽  
Storage Performance ◽  
Milling Method ◽  
Wet Chemical ◽  
Hydrogen Storage Performance ◽  
Kinetics Of ◽  
Storage Properties

Abstract: Catalytic doping plays an important role in enhancing the hydrogen storage performance of MgH2, while finding an efficient and reversible catalyst remains to be a great challenge in enhancing the de/rehydrogenation properties of MgH2. Herein, a bidirectional nano-TiH1.971 catalyst was prepared by a wet chemical ball milling method and its effect on hydrogen storage properties of MgH2 was studied. The results showed that all the TiH1.971 nanoparticles were effective in improving the de/rehydrogenation kinetics of MgH2. The MgH2 composites doped with TiH1.971 could desorb 6.5 wt % H2 in 8 min at 300 °C, while the pure MgH2 only released 0.3 wt % H2 in 8 min and 1.5 wt % H2 even in 50 min. It was found that the smaller the size of the TiH1.971 particles, the better was the catalytic effect in promoting the performance of MgH2. Besides, the catalyst concentration also played an important role and the 5 wt %-c-TiH1.971 modified system was found to have the best hydrogen storage performance. Interestingly, a significant hydrogen absorption amount of 4.60 wt % H2 was evidenced for the 5 wt %-c-TiH1.971 doped MgH2 within 10 min at 125 °C, while MgH2 absorbed only 4.11 wt% hydrogen within the same time at 250 °C. The XRD results demonstrated that the TiH1.971 remained stable in cycling and could serve as an active site for hydrogen transportation, which contributed to the significant improvement of the hydrogen storage properties of MgH2.

scholarly journals Roles of Ti-Based Catalysts on Magnesium Hydride and Its Hydrogen Storage Properties

Inorganics ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 36
Author(s):  
Chengshang Zhou ◽  
Jingxi Zhang ◽  
Robert C. Bowman ◽  
Zhigang Zak Fang
Keyword(s):  
Hydrogen Storage ◽  
Fundamental Principle ◽  
Magnesium Hydride ◽  
Elemental Abundance ◽  
High Hydrogen ◽  
Hydrogen Storage Properties ◽  
The Past ◽  
Kinetic Mechanisms ◽  
Kinetics Of ◽  
Storage Properties

Magnesium-based hydrides are considered as promising candidates for solid-state hydrogen storage and thermal energy storage, due to their high hydrogen capacity, reversibility, and elemental abundance of Mg. To improve the sluggish kinetics of MgH2, catalytic doping using Ti-based catalysts is regarded as an effective approach to enhance Mg-based materials. In the past decades, Ti-based additives, as one of the important groups of catalysts, have received intensive endeavors towards the understanding of the fundamental principle of catalysis for the Mg-H2 reaction. In this review, we start with the introduction of fundamental features of magnesium hydride and then summarize the recent advances of Ti-based additive doped MgH2 materials. The roles of Ti-based catalysts in various categories of elemental metals, hydrides, oxides, halides, and intermetallic compounds were overviewed. Particularly, the kinetic mechanisms are discussed in detail. Moreover, the remaining challenges and future perspectives of Mg-based hydrides are discussed.

Enhanced hydrogen storage properties of a Mg–Ag alloy with solid dissolution of indium: a comparative study

2015 ◽  
Vol 3 (16) ◽  
pp. 8581-8589 ◽  
Author(s):  
Tingzhi Si ◽  
Yu Cao ◽  
Qingan Zhang ◽  
Dalin Sun ◽  
Liuzhang Ouyang ◽  
...  
Keyword(s):  
Comparative Study ◽  
Hydrogen Storage ◽  
Hydrogen Storage Properties ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of ◽  
Storage Properties

Both thermodynamics and kinetics of the Mg5.7In0.3Ag–H2 system were significantly destabilized by combining Ag alloying with In dissolution.

scholarly journals Enhanced Hydrogen Storage Properties of Li-RHC System with In-House Synthesized AlTi3 Nanoparticles

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7853
Author(s):  
Thi-Thu Le ◽  
Claudio Pistidda ◽  
Julián Puszkiel ◽  
María Victoria Castro Riglos ◽  
David Michael Dreistadt ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogenation Reaction ◽  
Kinetic Behavior ◽  
High Hydrogen ◽  
Hydrogen Storage Properties ◽  
Storage Performance ◽  
Dehydrogenation Kinetics ◽  
Hydrogen Storage Performance ◽  
Kinetics Of ◽  
Storage Properties

In recent years, the use of selected additives for improving the kinetic behavior of the system 2LiH + MgB2 (Li-RHC) has been investigated. As a result, it has been reported that some additives (e.g., 3TiCl3·AlCl3), by reacting with the Li-RHC components, form nanostructured phases (e.g., AlTi3) possessing peculiar microstructural properties capable of enhancing the system’s kinetic behavior. The effect of in-house-produced AlTi3 nanoparticles on the hydrogenation/dehydrogenation kinetics of the 2LiH + MgB2 (Li-RHC) system is explored in this work, with the aim of reaching high hydrogen storage performance. Experimental results show that the AlTi3 nanoparticles significantly improve the reaction rate of the Li-RHC system, mainly for the dehydrogenation process. The observed improvement is most likely due to the similar structural properties between AlTi3 and MgB2 phases which provide an energetically favored path for the nucleation of MgB2. In comparison with the pristine material, the Li-RHC doped with AlTi3 nanoparticles has about a nine times faster dehydrogenation rate. The results obtained from the kinetic modeling indicate a change in the Li-RHC hydrogenation reaction mechanism in the presence of AlTi3 nanoparticles.

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