Absorption and desorption kinetics of hydrogen storage alloys

1996 ◽  
Vol 238 (1-2) ◽  
pp. 193-201 ◽  
Author(s):  
M. Martin ◽  
C. Gommel ◽  
C. Borkhart ◽  
E. Fromm
Keyword(s):  
Hydrogen Storage ◽  
Desorption Kinetics ◽  
Hydrogen Storage Alloys ◽  
Kinetics Of

Gaseous and Electrochemical Hydrogen Storage Kinetics of as-Spun Nanocrystalline Mg20Ni10-xCux (x = 0-4) Alloys

2011 ◽  
Vol 393-395 ◽  
pp. 780-785
Author(s):  
Yang Huan Zhang ◽  
Bao Wei Li ◽  
Hui Ping Ren ◽  
Xia Li ◽  
Guo Fang Zhang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Melt Spinning ◽  
Nanocrystalline Structure ◽  
Desorption Kinetics ◽  
Hydrogen Storage Alloys ◽  
Hydrogen Storage Kinetics ◽  
Cu Substitution ◽  
Electrochemical Hydrogen Storage ◽  
Cast Alloys ◽  
Kinetics Of

In order to improve the gaseous and electrochemical hydrogen storage kinetics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by element Cu. Melt-spinning technology was used for the preparation of the Mg20Ni10-xCux (x = 0, 1, 2, 3, 4) hydrogen storage alloys. The structures of the as-cast and spun alloys are characterized by XRD, SEM and TEM. The gaseous hydrogen absorption and desorption kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The electrochemical hydrogen storage kinetics of the as-spun alloys is tested by an automatic galvanostatic system. The results show that all the as-spun alloys hold an entire nanocrystalline structure and are free of amorphous phase. The substitution of Cu for Ni, instead of changing the major phase Mg2Ni, leads to a visible refinement of the grains of the as-cast alloys. Furthermore, both the melt spinning treatment and Cu substitution significantly improve the gaseous and electrochemical hydrogen storage kinetics of the alloys.

A new model to describe absorption kinetics of Mg-based hydrogen storage alloys

2011 ◽  
Vol 36 (20) ◽  
pp. 12923-12931 ◽  
Author(s):  
Guangxin Wu ◽  
Jieyu Zhang ◽  
Qian Li ◽  
Kuochih Chou
Keyword(s):  
Hydrogen Storage ◽  
Absorption Kinetics ◽  
Hydrogen Storage Alloys ◽  
New Model ◽  
Kinetics Of

A comparative study on the hydriding kinetics of Zr-based AB2 hydrogen storage alloys

2008 ◽  
Vol 16 (5) ◽  
pp. 662-667 ◽  
Author(s):  
Xiao-Yang Cui ◽  
Qian Li ◽  
Kuo-Chih Chou ◽  
Shuang-Lin Chen ◽  
Gen-Wen Lin ◽  
...  
Keyword(s):  
Comparative Study ◽  
Hydrogen Storage ◽  
Hydrogen Storage Alloys ◽  
Kinetics Of ◽  
Hydriding Kinetics

An Investigation on the Gaseous and Electrochemical Hydrogen Storage Kinetics of As-Spun Nanocrystalline Mg20Ni10-xCOx (x=0-4) Alloys

2011 ◽  
Vol 393-395 ◽  
pp. 587-592
Author(s):  
Bao Wei Li ◽  
Hui Ping Ren ◽  
Zhong Hui Hou ◽  
Xiao Gang Liu ◽  
Le Le Chen ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Absorption ◽  
Melt Spinning ◽  
Nanocrystalline Structure ◽  
Hydrogen Desorption ◽  
Amorphous Structure ◽  
Desorption Kinetics ◽  
Hydrogen Storage Kinetics ◽  
Electrochemical Hydrogen Storage ◽  
Kinetics Of

In order to improve the gaseous and electrochemical hydrogen storage kinetics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by element Co. Melt-spinning technology was used for the preparation of the Mg20Ni10-xCox (x=0, 1, 2, 3, 4) hydrogen storage alloys. The structures of the as-cast and spun alloys are characterized by XRD, SEM and TEM. The gaseous hydrogen absorption and desorption kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The electrochemical hydrogen storage kinetics of the as-spun alloys is tested by an automatic galvanostatic system. The results show that the as-spun Co-free alloy holds a typical nanocrystalline structure, whereas the as-spun alloys substituted by Co display a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. Both the melt spinning and the substitution of Co for Ni evidently ameliorate the hydriding and dehydriding kinetics and the HRD of the alloys. With an increase in the spinning rate from 0 (As-cast was defined as spinning rate of 0 m/s) to 30 m/s, the hydrogen absorption saturation ratio ( ) of the Co4 alloy grows from 77.1 to 93.5 wt.%, the hydrogen desorption ratio ( ) from 54.5% to 70.2%, the HRD from 60.3% to 76.0%, respectively.

scholarly journals Kinetics of the hydrogen absorption and desorption processes of hydrogen storage alloys: A review

2022 ◽  
Vol 29 (1) ◽  
pp. 32-48
Author(s):  
Qian Li ◽  
Xi Lin ◽  
Qun Luo ◽  
Yu’an Chen ◽  
Jingfeng Wang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Absorption ◽  
Hydrogen Storage Alloys ◽  
Kinetics Of

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 Mechanical alloys Mg-Me (Me: Ti, Fe, Ni, Al) & Mg-Me1-Me2(Ме1:Al, Me2: Ti, Fe, Ni) with low resistance and improved kinetics of hydrogenation/dehydrogenation for hydrogen storage applications

2018 ◽  
Vol 6 (1) ◽  
pp. 31-55 ◽  
Author(s):  
O. Ershova ◽  
V. Dobrovolsky ◽  
Y. Solonin
Keyword(s):  
Thermal Stability ◽  
Hydrogen Storage ◽  
Sorption Capacity ◽  
Hydrogen Pressure ◽  
Hydrogen Desorption ◽  
Decomposition Kinetics ◽  
Hydrogen Storage Alloys ◽  
Mechanically Alloyed ◽  
Kinetics Of ◽  
Complex Doping

Changes in MgH2 decomposition kinetics were investigated in dependence on complex doping of MgH2 by Al, Ti, Ni, and Fe. Reactive mechanochemical alloying method (RMA) was applied in the temperature descending regime. It was found that addition of Al+Ni+Ti, Al+Ti, Fe+Ti (see below) and Al+Fe elements combinations led to a lower thermal stability and, consequently, to a lowering of the temperature of hydrogen desorption onset. Whereas desorption began at temperature of 320 °C from the pure MgH2, the aditions of Al, Ni, Ti and Fe lowered the start of the desorption down to 250°C (at hydrogen pressure 0.1 MPa in the reactor). Very fast desorption kineticsprecize at 300 0C and PH 2= 0.1 MPa were observed for Mg+Me mixture in comparison with the pure Mg. Sorption capacity of investigated mechanically-alloyed composites varied from 5 to 6.5 wt. % H2. The tested materials showed a high potential as hydrogen storage alloys especially for stationary application.

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