Improved Physical and Electrochemical Hydrogen Storage Kinetics of the Mg₂₀Ni_10-XMx (M=Cu, Co; X=0, 4) Alloys by Melt Spinning

Abstract:

It has come to light that the Mg₂Ni-type alloy with a nanocrystalline/amorphous structure possesses superior hydrogen storage kinetics. The Mg₂Ni-type Mg₂₀Ni_10-xM_x (M=Cu, Co; x=0, 4) hydrogen storage alloys were synthesized by a melt-spinning technique. The microstructures of the as-cast and spun alloys were characterized by XRD, SEM and HRTEM. The gaseous and electrochemical hydrogen storage kinetics of the alloys was measured. The results show that whatever spinning rate the as-spun (M=Cu) alloys hold an entire nanocrystalline structure. As spinning rate approaches to 20 m/s, 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 melt spinning markedly improves the gaseous and electrochemical hydrogen storage kinetics of the alloys. The hydrogen absorption ratio (R₅^a ), hydrogen desorption ratio (R₂₀^d ) and the high rate discharge ability (HRD) notably mount up with the growing of the spinning rate.

• Periodical: Advanced Materials Research (Volume 499)
• Pages: 25-30
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.499.25
• Online since: April 2012
• Authors: Yang Huan Zhang, Li Zhao Guo, Hong Wei Shang, Zhong Hui Hou, Ying Cai, Dong Liang Zhao
• Keywords: Hydrogen Storage Kinetics, Melt Spinning, Mg₂Ni-Type Alloy, Structure

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

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