Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg2Ni-type Alloys

doi:10.11901/1005.3093.2014.114

Chinese Journal of Materials Research

2014, Vol. 28

Issue (11): 873-880 DOI: 10.11901/1005.3093.2014.114

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Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg₂Ni-type Alloys

Yanghuan ZHANG^1,^2,^**(

),Zeming YUAN²,Tingting ZHAI²,Tai YANG²,Guofang ZHANG¹,Dongliang ZHAO²

1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010
2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081

Cite this article:

Yanghuan ZHANG,Zeming YUAN,Tingting ZHAI,Tai YANG,Guofang ZHANG,Dongliang ZHAO. Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg₂Ni-type Alloys. Chinese Journal of Materials Research, 2014, 28(11): 873-880.

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Abstract

A series (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x(x = 0, 5, 10, 15, 20) alloys with a microstructure of nanocrystalline and amorphous structure were prepared by melt spinning technology. The effect of spinning rate and Nd content on the microstructure and the hydrogen storage performance of the alloys was investigated. The results of XRD and TEM examination reveal that all the as-cast alloys exhibit a multiphase microstructure, i.e. Mg₂Ni-type phase is the major component and there exist several secondary phases such as Mg₆Ni, Nd₅Mg₄₁ and NdNi. Furthermore, the as-spun Nd-free alloy shows a microstructure of entire nanocrystallines, whereas the as-spun alloys with Nd addition exhibit a microstructure of nanocrystalline and amorphous structure, meaning that the addition of Nd facilitates the glass forming of the alloys. The measurement of the hydrogen storage kinetics indicates that the melt spinning and the Nd addition can significantly improve the hydrogen storage performance of the alloys either in gaseous atmosphere or by electrochemically charging, and with the increasing spin rate and the amount of Nd addition, the high rate discharge capability (HRD) of the alloys increases firstly and then declines, for which the enhanced hydrogen diffusion coefficient (D) and limiting current density (I_L) and the increased charge transfer resistance (R_ct) resulted from both the melt spinning and the Nd addition are possibly responsible.

Key words: metallic materials Mg₂Ni-type alloy melt spinning Nd addition hydrogen storage kinetics

Received: 10 March 2014

Fund: *Supported by National Natural Science Foundation of China Nos.51161015 & 51371094, and Natural Science Foundation of Inner Mongolia No.2011ZD10.

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	Yanghuan ZHANG
	Zeming YUAN
	Tingting ZHAI
	Tai YANG
	Guofang ZHANG
	Dongliang ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.114 OR https://www.cjmr.org/EN/Y2014/V28/I11/873

Fig.1 XRD spectra of the as-cast and spun alloys, (a) Nd₁₀ alloy, (b) as-spun (30 ms^-1)

Fig.2 TEM images and ED patterns of the as-spun alloys, (a-d) Nd₁₀ alloy spun at 10, 20, 30, 40 ms^-1, respectively; (e-h) Nd₀, Nd₅, Nd₁₅, Nd₂₀ alloys spun at 30 ms^-1, respectively

Fig.3 DSC curves of the as-spun (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x (x = 0-20) alloys, (a) Nd₁₀ alloy, (b) As-spun (30 ms^-1)

Fig.4 Evolutions of the R₅^a and C₁₀₀^a values of the as-cast and spun (Mg₂₄Ni₁₀Cu₂)_100-xNd_x (x = 0-20) alloys with the spinning rate and the Nd content, (a) Nd₁₀ alloy, (b) as-spun (30 m·s^-1)

Fig.5 Evolutions of the R10d and C10d values of the as-cast and spun (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x (x = 0-20) alloys withthe spinning rate and the Nd content, (a) Nd₁₀ alloy, (b) as-spun (30 ms^-1)

Fig.6 Evolution of HRDs of the as-cast and spun (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x (x = 0-20) alloys with current density, (a) Nd₁₀ alloy, (b) as-spun (30 ms^-1)

Fig.7 Electrochemical impedance spectra (EIS) of the as-cast and spun (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x (x = 0-20) alloys at the 50% depth of discharge (DOD), (a) Nd₁₀ alloy, (b) as-spun (30 ms^-1)

Fig.8 Semilogarithmic curves of anodic current vs. time responses of the as-cast and spun (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x(x = 0-20) alloys, (a) Nd₁₀ alloy, (b) as-spun (30 ms^-1)

Fig.9 Tafel polarization curves of the as-cast and spun (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x(x = 0-20) alloys at the 50% DOD, (a) Nd₁₀ alloy, (b) as-spun (30 ms^-1)

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