Gaseous and electrochemical hydrogen storage kinetics of as-quenched nanocrystalline and amorphous Mg2Ni-type alloys

In this paper, melt-spinning technology was used for preparing Mg20Ni10-xCox (x = 0, 1, 2, 3, 4) hydrogen storage alloys. The influences of both the Co substitution and the melt spinning on the the physical and electrochemical hydrogen storage kinetics of the alloys were investigated. The XRD, SEM and TEM characterization exhibits 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. The Co substitution gives rise to forming secondary phase MgCo2 without altering the Mg2Ni major phase of the alloys. The measurement of the physical and electrochemical hydrogen storage kinetics of the alloys shows that both the melt spinning and the substitution of Co for Ni markedly improve the physical hydriding and dehydriding kinetics and the electrochmeical kinetics (HRD) of the alloys.

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Highly ameliorated gaseous and electrochemical hydrogen storage kinetics of nanocrystalline and amorphous CeMg12-type alloys by mechanical milling

Solid State Sciences ◽

10.1016/j.solidstatesciences.2019.02.004 ◽

2019 ◽

Vol 90 ◽

pp. 41-48

Author(s):

Yanghuan Zhang ◽

Xufeng Li ◽

Zhonghui Hou ◽

Zeming Yuan ◽

Yan Qi ◽

...

Keyword(s):

Hydrogen Storage ◽

Mechanical Milling ◽

Hydrogen Storage Kinetics ◽

Nanocrystalline And Amorphous ◽

Electrochemical Hydrogen Storage ◽

Kinetics Of

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Investigation of Electrochemical Hydrogen Storage Kinetics of Melt Spun Nanocrystalline and Amorphous Mg2Ni-type Alloy

Rare Metal Materials and Engineering ◽

10.1016/s1875-5372(12)60037-x ◽

2012 ◽

Vol 41 (4) ◽

pp. 565-569 ◽

Cited By ~ 1

Author(s):

Zhang Yanghuan ◽

Hu Feng ◽

Liu Zhuocheng ◽

Li Zhigang ◽

Guo Shihai ◽

...

Keyword(s):

Hydrogen Storage ◽

Type Alloy ◽

Hydrogen Storage Kinetics ◽

Nanocrystalline And Amorphous ◽

Electrochemical Hydrogen Storage ◽

Melt Spun ◽

Kinetics Of

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Preparation and Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg20Ni10-xMx (M=Co, Cu; x=0-4) Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.528.43 ◽

2012 ◽

Vol 528 ◽

pp. 43-49

Author(s):

Yang Huan Zhang ◽

Zhong Hui Hou ◽

Guo Fang Zhang ◽

Hong Wei Shang ◽

Feng Hu ◽

...

Keyword(s):

Hydrogen Storage ◽

Electrochemical Impedance ◽

Amorphous Structure ◽

High Rate ◽

Electrochemical Kinetics ◽

Type Alloy ◽

Hydrogen Storage Kinetics ◽

Nanocrystalline And Amorphous ◽

Electrochemical Hydrogen Storage ◽

Kinetics Of

In order to obtain a nanocrystalline and amorphous structure in the Mg2Ni-type alloy, the Ni in Mg2Ni alloy has been partially substituted by M (M=Co, Cu), and the melt spinning has been used to fabricate the Mg20Ni10-xMx (M=Co, Cu; x=0-4) hydrogen storage alloys. The microstructures of the alloys were characterized by XRD, SEM and HRTEM. The effects of substituting Ni with M (M=Co, Cu) on the gaseous and electrochemical hydrogen storage kinetics of the as-spun alloys were investigated. The results indicate that the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure, while the as-spun (M=Cu) alloys hold an entire nanocrystalline structure, suggesting that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The substitution of M (M=Co, Cu) for Ni exerts a trifling impact on the hydriding kinetics of the alloys, but it renders a marked enhancement of dehydriding capacity and kinetics. Furthermore, the measurements of the high rate discharge ability (HRD) and the hydrogen diffusion coefficient (D) as well as the electrochemical impedance spectra (EIS) of the alloys exhibit that the electrochemical kinetics of the as-spun (30 m/s) alloys is significantly ameliorated by substituting Ni with M (M=Co, Cu).

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Ameliorated Hydrogen Storage Kinetics of Mg20Ni7M3 (M=Co, Cu) Alloys by Melt Spinning

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.184-185.880 ◽

2012 ◽

Vol 184-185 ◽

pp. 880-885

Author(s):

Yang Huan Zhang ◽

Zhong Hui Hou ◽

Li Cui Chen ◽

Tai Yang ◽

Hong Wei Shang ◽

...

Keyword(s):

Hydrogen Storage ◽

Melt Spinning ◽

Amorphous Structure ◽

Limiting Current ◽

Type Alloy ◽

Hydrogen Storage Kinetics ◽

Cu Alloys ◽

Nanocrystalline And Amorphous ◽

Electrochemical Hydrogen Storage ◽

Kinetics Of

In order to obtain a nanocrystalline and amorphous structure in the Mg2Ni-type alloy, the melt spinning was applied to fabricate the Mg20Ni7M3 (M=Co, Cu) hydrogen storage alloys. The microstructures of the alloys were characterized by XRD, SEM and HRTEM. The effects of the melt spinning on the gaseous and electrochemical hydrogen storage kinetics of the alloys were investigated. The results indicate that the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure as spinning rate grows to 20 m/s, while the as-spun (M=Cu) alloys hold an entire nanocrystalline structure even if a limited spinning rate is applied, suggesting that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The melt spinning remarkably ameliorates the gaseous hydriding and dehydriding kinetics of the alloys. The hydrogen absorption ratio ( ) and hydrogen desorption ratio ( ) are enhanced from 81.9% to 94.7% and from 34.9% to 57.3% for the (M=Co) alloy, and from 57.2% to 92.8% and from 21.6% to 49.6% for the (M=Cu) alloy by raising spinning rate from 0 (as-cast was defined as the spinning rate of 0 m/s) to 30 m/s. Furthermore, the high rate discharge ability (HRD), the limiting current density (IL) and the hydrogen diffusion coefficient (D) of the alloys notably increase with the growing of the spinning rate.

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