Effect of Na3FeF6 catalyst on the hydrogen storage properties of MgH2

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).

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

Nanoscale ◽

10.1039/c8nr10275a ◽

2019 ◽

Vol 11 (15) ◽

pp. 7465-7473 ◽

Cited By ~ 27

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.

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

MRS Advances ◽

10.1557/adv.2020.29 ◽

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.

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

Advances in Materials Science and Engineering ◽

10.1155/2010/138642 ◽

2010 ◽

Vol 2010 ◽

pp. 1-7 ◽

Cited By ~ 3

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.

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