scholarly journals RESEARCH OF THE KINETICS OF THE FIRST HYDRATION OF MATERIAL TIFE + TI2FE, OBTAINED BY EXPLOSIVE LOADING OF MIXTURES OF TITANIUM AND IRON POWDERS

2021 ◽  
pp. 61-68
Author(s):  
A. V. Krokhalev ◽  
V. O. Kharlamov ◽  
D. R. Chernikov ◽  
O. O. Tuzhikov ◽  
S. V. Kuz’min ◽  
...  
Keyword(s):  
Single Phase ◽  
Reaction Diffusion ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Iron Powders ◽  
Hydrogen Capacity ◽  
Mathematical Processing ◽  
Kinetics Of ◽  
Hydride Phases ◽  
Explosive Pressing

The kinetics of the processes of primary hydrogenation of material based on TiFe obtained by explosive pressing of titanium and iron powders with subsequent heat treatment has been investigated. Using the results obtained and mathematical processing of the curves using the Avraami-Erofeev equation, it was revealed that the mechanism of their saturation with hydrogen corresponds to the classical concepts of reaction diffusion. The process begins with the formation of a layer of solid solutions of hydrogen on the surface of the material in the initial phases of the material and after the latent period continues with the formation of a layer of hydride phases. t is shown that the hydrogen storage material TiFe + TiFe has a significantly higher hydrogen capacity than single-phase TiFe.

Effects of Ce-Based Dopants on the Hydrogen Storage Material of NaAlH4

2012 ◽  
Vol 1441 ◽  
Author(s):  
Jianjiang Hu ◽  
Raiker Witter ◽  
Shuhua Ren ◽  
Maximilian Fichtner
Keyword(s):  
Hydrogen Storage ◽  
Sorption Properties ◽  
Desorption Kinetics ◽  
Chemical Forms ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Hydrogen Capacity ◽  
Heating Treatment ◽  
Up Scaling

ABSTRACTCerium in various chemical forms was introduced into NaAlH4 to study the hydrogen sorption properties of the resulted material. Although all the Ce precursors tested in this work resulted in a reversible hydrogen storage material, an immediate enhancement in the desorption kinetics could be achieved by a heating treatment, resulting in the in situ formation of cerium aluminide (CeAl4) in the material. While the use of CeAl4 instead of CeCl3 can increase the hydrogen capacity by bypassing the formation of the ineffective NaCl, the highest capacity of 4.9 wt% was obtained from NaAlH4 doped directly with commercial metallic cerium, which may provide a much simplified process for a possible up-scaling preparation of this hydrogen storage material.

scholarly journals Improved kinetic behaviour of Mg(NH2)2-2LiH doped with nanostructured K-modified-LixTiyOz for hydrogen storage

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Gökhan Gizer ◽  
Julián Puszkiel ◽  
Maria Victoria Castro Riglos ◽  
Claudio Pistidda ◽  
José Martín Ramallo-López ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Hydrogen Capacity ◽  
Kinetic Behaviour ◽  
Enhanced Absorption ◽  
Tiny Amount ◽  
Slow Absorption ◽  
Kinetic Barriers

AbstractThe system Mg(NH2)2 + 2LiH is considered as an interesting solid-state hydrogen storage material owing to its low thermodynamic stability of ca. 40 kJ/mol H2 and high gravimetric hydrogen capacity of 5.6 wt.%. However, high kinetic barriers lead to slow absorption/desorption rates even at relatively high temperatures (>180 °C). In this work, we investigate the effects of the addition of K-modified LixTiyOz on the absorption/desorption behaviour of the Mg(NH2)2 + 2LiH system. In comparison with the pristine Mg(NH2)2 + 2LiH, the system containing a tiny amount of nanostructured K-modified LixTiyOz shows enhanced absorption/desorption behaviour. The doped material presents a sensibly reduced (∼30 °C) desorption onset temperature, notably shorter hydrogen absorption/desorption times and reversible hydrogen capacity of about 3 wt.% H2 upon cycling. Studies on the absorption/desorption processes and micro/nanostructural characterizations of the Mg(NH2)2 + 2LiH + K-modified LixTiyOz system hint to the fact that the presence of in situ formed nanostructure K2TiO3 is the main responsible for the observed improved kinetic behaviour.

scholarly journals Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La1.5Mg0.5Ni7−xMx alloys (M = Al, Mn)

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 578
Author(s):  
Marek Nowak ◽  
Mateusz Balcerzak ◽  
Mieczyslaw Jurczyk
Keyword(s):  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Hydrogen Desorption ◽  
Practical Aspect ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Mechanically Alloyed ◽  
Electrochemical Capacity ◽  
Mn Content ◽  
Kinetics Of

The A2B7-type La-Mg-Ni-M-based (M = Al, Mn) intermetallic compounds were produced by mechanical alloying and annealing. The thermodynamic and electrochemical properties of these materials were studied. The nickel substitution by aluminum and manganese in the La-Mg-Ni system improves the kinetics of hydrogen absorption. The hydrogen desorption capacity of Mn substituted compounds is improved significantly, and it reaches the value of 1.79 wt.% at 303 K when the composition is La1.5Mg0.5Ni6.80Mn0.20. On the other hand, the La1.5Mg0.5Ni6.85Al0.15 shows a much higher reversible electrochemical capacity than the La1.5Mg0.5Ni7 materials at the 50th cycle. The electrochemical discharge capacity stability increases with the increasing value of Al and Mn up to x = 0.2 and 0.3, respectively. Additionally, a reduction in the discharge capacity was measured for the Al and Mn content above x = 0.25 and 0.5, respectively. From the practical aspect, only La1.5Mg0.5Ni6.80Mn0.20 has a potential in the application as a hydrogen storage material.

Catalyzed KSiH3as a reversible hydrogen storage material

2016 ◽  
Vol 4 (48) ◽  
pp. 19045-19052 ◽  
Author(s):  
R. Janot ◽  
W. S. Tang ◽  
D. Clémençon ◽  
J.-N. Chotard
Keyword(s):  
Solid State ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Hydrogen Storage Material ◽  
Ambient Conditions ◽  
Storage Material ◽  
Hydrogen Storage Capacity ◽  
Hydrogen Storage Kinetics ◽  
Reversible Formation ◽  
Kinetics Of

Solid-state hydrogen storage through the reversible formation of metallic hydrides is a key issue for the development of hydrogen as an energy vector. Here the hydrogen storage kinetics of the reaction between KSi and KSiH3have been strongly enhanced by catalyst addition. The reaction is perfectly reversible near ambient conditions with a 4.1 wt% hydrogen storage capacity.

Mg-Ni-H Hydrogen Storage System Prepared by Controlled Hydriding Combustion Synthesis

2011 ◽  
Vol 197-198 ◽  
pp. 749-752 ◽  
Author(s):  
Jing Liu ◽  
Qian Li ◽  
Kuo Chih Chou
Keyword(s):  
Magnetic Field ◽  
Hydrogen Storage ◽  
Combustion Synthesis ◽  
High Magnetic Field ◽  
Storage System ◽  
Magnetic Intensity ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Hydrogen Capacity ◽  
Hydrogen Storage System

The Mg2NiH4 hydrogen storage material was successfully prepared by controlled hydriding combustion synthesis (CHCS) from Mg and Ni powders in a high magnetic field. The effects of magnetic intensity on the structure, phase compositions and the hydriding/dehydriding (A/D) properties of the composite are investigated. As a result, a high magnetic field promotes the formation of Mg2NiH4. The PCT results show that the maximal hydrogen capacity at 573 K is 3.59 wt.%. The comparison of the hydrogen A/D results under the different conditions suggested that 4 T is the optimal magnetic intensity in our trial.

Analysis of process of emulsions transport in hydrophilic/oleophilic granular porous media driven by capillary force

2018 ◽  
Vol 2 (21) ◽  
pp. 85-101
Author(s):  
Olga Shtyka ◽  
Łukasz Przybysz ◽  
Mariola Błaszczyk ◽  
Jerzy P. Sęk
Keyword(s):  
Porous Media ◽  
Experimental Research ◽  
Granular Media ◽  
Single Phase ◽  
Influential Factor ◽  
Dispersed Phase ◽  
Porous Structures ◽  
Phase Concentration ◽  
Granular Porous Media ◽  
Kinetics Of

The research focuses on the issues concerning a process of multiphase liquids transport in granular porous media driven by the capillary pressure. The current publication is meant to introduce the results of experimental research conducted to evaluate the kinetics of the imbibition and emulsions behavior inside the porous structures. Moreover, the influence of the dispersed phase concentration and granular media structure on the mentioned process was considered. The medium imbibition with emulsifier-stabilized emulsions composed of oil as the dispersed phase in concentrations of 10 vol%, 30 vol%, and 50 vol%, was investigated. The porous media consisted of oleophilic/hydrophilic beads with a fraction of 200–300 and 600–800 μm. The experimental results provided that the emulsions imbibition in such media depended stronger on its structure compare to single-phase liquids. The increase of the dispersed phase concentration caused an insignificant mass decreasing of the imbibed emulsions and height of its penetration in a sorptive medium. The concentrations of the imbibed dispersions exceeded their initial values, but reduced with permeants front raise in the granular structures that can be defined as the influential factor for wicking process kinetics.

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