Electrochemical Hydrogen Storage Performances of the Nanocrystalline and Amorphous Mg₂Ni-Type Alloys

Abstract:

The melt-spinning technique is applied to the preparation of the nanocrystalline and amorphous Mg2Ni-type alloys with nominal compositions of Mg₂₀Ni_10-xMn_x (x=0, 1, 2, 3, 4). The microstructures of the as-cast and spun alloys were characterized by XRD and HRTEM. The electrochemical performances of the as-spun alloys are measured by an automatic galvanostatic system. The results show that the as-spun Mg₂₀Ni₁₀ alloy displays an entire nanocrystalline structure, whereas the as-spun Mg20Ni6Mn4 alloy exhibits a nanocrystalline and amorphous structure, confirming that the substitution of Mn for Ni facilitates the glass formation in the Mg₂Ni-type alloy. And the amorphization degree of the as-spun alloys substituted by Mn increases with the growing of the spinning rate. The substitution of Mn for Ni and the melt spinning ameliorate electrochemical hydrogen storage characteristics of the alloys substantially. The electrochemical discharge capacity and cycle stability of the alloys are considerably enhanced by increasing the amount of Mn substitution and the spinning rate. The high rate discharge ability (HRD) of the alloys first augments and then falls with the growing of the Mn content and the spinning rate.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 1169-1173
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.1169
• Online since: July 2012
• Authors: Yang Huan Zhang, Chao Xu, Tai Yang, Zhong Hui Hou, Guo Fang Zhang, Dong Liang Zhao
• Keywords: Electrochemical Hydrogen Storage Performances, Melt-Spinning, Mg₂Ni-Type Alloy, Structure

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DOI: 10.1016/s0925-8388(03)00544-9