Hydrogen storage and low-temperature electrochemical performances of A 2 B 7 type La-Mg-Ni-Co-Al-Mo alloys

Mg2Ni-type Mg20Ni10-xMx (M=Cu, Co; x=0, 1, 2, 3, 4) electrode alloys with nanocrystalline and amorphous structure were synthesized by melt-spinning technique. The microstructures of the as-spun alloys were characterized by XRD, SEM and HRTEM. The electrochemical hydrogen storage properties of the experimental alloys were measured. The obtained results show that the as-spun (M=Cu) alloys hold an entire nanocrystalline structure, whereas the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. Furthermore, such substitution results in the formation of secondary phases Mg2Cu and MgCo2 instead of changing the major phase of Mg2Ni. The substitution of M (M=Cu, Co) for Ni markedly improves the electrochemical performances of the alloys, involving the discharge capacity and the cycle stability as well as the high rate discharge ability.

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Hydrogen adsorption on hydrogen storage alloy surface and electrochemical performances of the MlNi4.0Co0.6Al0.4 alloy electrodes before and after surface treatment

International Journal of Hydrogen Energy ◽

10.1016/s0360-3199(01)00009-x ◽

2001 ◽

Vol 26 (7) ◽

pp. 675-681 ◽

Cited By ~ 5

Author(s):

W Chen

Keyword(s):

Hydrogen Storage ◽

Surface Treatment ◽

Hydrogen Adsorption ◽

Hydrogen Storage Alloy ◽

Alloy Surface ◽

Electrochemical Performances ◽

Before And After

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Synthesis and Electrochemical Performances of LiNiCuZn Oxides as Anode and Cathode Catalyst for Low Temperature Solid Oxide Fuel Cell

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2012.4940 ◽

2012 ◽

Vol 12 (6) ◽

pp. 5102-5105 ◽

Cited By ~ 9

Author(s):

Y. Jing ◽

H. Qin ◽

Q. Liu ◽

M. Singh ◽

B. Zhu

Keyword(s):

Fuel Cell ◽

Low Temperature ◽

Solid Oxide Fuel Cell ◽

Solid Oxide ◽

Electrochemical Performances ◽

Cathode Catalyst ◽

Oxide Fuel

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Low Temperature Characteristics of Hydrogen Storage Alloy LaMm-Ni4.1Al0.3Mn0.4Co0.45 for Ni-MH Batteries

Materials ◽

10.3390/ma12244220 ◽

2019 ◽

Vol 12 (24) ◽

pp. 4220

Author(s):

Malgorzata Karwowska ◽

Karol J. Fijalkowski ◽

Andrzej A. Czerwiński

Keyword(s):

Low Temperature ◽

Hydrogen Storage ◽

High Reliability ◽

Alkali Metal Hydroxide ◽

Type Alloy ◽

Temperature Characteristics ◽

Nickel Hydride ◽

And Diffusion ◽

Diffusion Of Hydrogen ◽

Storage Properties

Nickel hydride batteries (Ni-MH) are known of their good performance and high reliability at temperatures below 0 °C, which is significantly dependent on electrolyte composition. Here we present the low temperature characteristics of pristine AB5-type alloy, LaMm-Ni4.1Al0.3Mn0.4Co0.45, determined in various alkali metal hydroxide solutions. We found that the combination of KOH with NaOH showed a significant effect of enhancement of low temperature performance of the electrode material and diffusion of hydrogen in the alloy. This 6M binary mixed NaOH/KOH electrolyte, comprising 4M KOH component and 2M NaOH component, made it possible to maintain 81.7% and 61.0% of maximum capacity at −20 °C and −30 °C, respectively, enhancing the hydrogen storage properties of the alloy after reheating to room temperature.

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