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.

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.

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).

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 Morphology Effect on the Kinetic Parameters and Surface Thermodynamic Properties of Ag3PO4Micro-/Nanocrystals

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Zai-Yin Huang ◽  
Xing-Xing Li ◽  
Zuo-Jiao Liu ◽  
Liang-Ming He ◽  
Xue-Cai Tan
Keyword(s):  
Activation Energy ◽  
Free Energy ◽  
Surface Energy ◽  
Thermodynamic Properties ◽  
High Surface ◽  
Surface Energies ◽  
Lower Activation ◽  
High Surface Energy ◽  
Energy Activation ◽  
Lower Activation Energy

Considerable effort has been exerted using theoretical calculations to determine solid surface energies. Nanomaterials with high surface energy depending on morphology and size exhibit enhanced reactivity. Thus, investigating the effects of morphology, size, and nanostructure on the surface energies and kinetics of nanomaterials is important. This study determined the surface energies of silver phosphate (Ag3PO4) micro-/nanocrystals and their kinetic parameters when reacting with HNO3by using microcalorimetry. This study also discussed rationally combined thermochemical cycle, transition state theory, basic theory of chemical thermodynamics with thermokinetic principle, morphology dependence of reaction kinetics, and surface thermodynamic properties. Results show that the molar surface enthalpy, molar surface entropy, molar surface Gibbs free energy, and molar surface energy of cubic Ag3PO4micro-/nanocrystals are larger than those of rhombic dodecahedral Ag3PO4micro-/nanocrystals. Compared with rhombic dodecahedral Ag3PO4, cubic Ag3PO4with high surface energy exhibits higher reaction rate and lower activation energy, activation Gibbs free energy, activation enthalpy, and activation entropy. These results indicate that cubic Ag3PO4micro-/nanocrystals can overcome small energy barrier faster than rhombic dodecahedral Ag3PO4micro-/nanocrystals and thus require lower activation energy.

Impact of the addition of poly-dihydrogen ruthenium precursor complexes on the hydrogen storage properties of the Mg/MgH2 system

2018 ◽  
Vol 2 (10) ◽  
pp. 2335-2344 ◽  
Author(s):  
Basile Galey ◽  
Aline Auroux ◽  
Sylviane Sabo-Etienne ◽  
Mary Grellier ◽  
Sameh Dhaher ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Absorption Properties ◽  
Hydrogen Storage Properties ◽  
System P ◽  
P Addition ◽  
Storage Properties

Addition of ruthenium precursor complexes to the Mg/MgH2 system for improved desorption and absorption properties.

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.

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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