Gaseous and Electrochemical Hydrogen Storage Kinetics of as-Spun Nanocrystalline Mg₂₀Ni_10-xCu_x (x = 0-4) Alloys

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 393-395)
• Pages: 780-785
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.393-395.780
• Online since: November 2011
• Authors: Yang Huan Zhang, Bao Wei Li, Hui Ping Ren, Xia Li, Guo Fang Zhang, Dong Liang Zhao
• Keywords: Hydrogen Storage Kinetics, Melt-Spinning, Mg₂Ni-Type Alloy, Substituting Ni with Cu

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