Enhancing Effect of LPSO Phases on Hydrogen ab- and de-Sorption Kinetics of Mg94Cu4Y2 Alloy

doi:10.11901/1005.3093.2015.189

Chinese Journal of Materials Research

2016, Vol. 30

Issue (4): 248-254 DOI: 10.11901/1005.3093.2015.189

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Enhancing Effect of LPSO Phases on Hydrogen ab- and de-Sorption Kinetics of Mg₉₄Cu₄Y₂ Alloy

LIU Jiangwen, ZOU Changcheng, WANG Hui^**(

), OUYANG Liuzhang, ZENG Meiqin, ZHU Min

Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Cite this article:

LIU Jiangwen, ZOU Changcheng, WANG Hui, OUYANG Liuzhang, ZENG Meiqin, ZHU Min. Enhancing Effect of LPSO Phases on Hydrogen ab- and de-Sorption Kinetics of Mg₉₄Cu₄Y₂ Alloy. Chinese Journal of Materials Research, 2016, 30(4): 248-254.

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Abstract

An alloy Mg₉₄Cu₄Y₂ with a large quantity of long-period stacking ordered (LPSO) phases bearing Cu and Y was designed and prepared in this paper. The microstructural transformations and the hydrogen absorption/desorption properties of the alloy were characterized during hydrogenation and dehydrogenation processes. The cast Mg₉₄Cu₄Y₂ alloy consists of phases such as Mg, Mg₂Cu and LPSOs with 18R or 14H type. The LPSOs decomposed at the first hydrogenation, and in situ formed highly even dispersed nanocomposite (MgH₂+MgCu₂+YH₃). The Mg/MgH₂ was the main reaction during the subsequent dehydrogenation cycles. The alloy exhibits excellent hydrogen absorption and desorption kinetics because the nano-sized and even dispersed Mg₂Cu and YH₂catalyzed effectively the Mg/MgH₂ reactions.

Key words: metallic materials hydrogen storage alloy Mg-Cu-Y long period stacking ordered structure kinetics TEM

Received: 08 April 2015

ZTFLH:

TG139

Fund: Supported by National Natural Science Foundation of China Nos. 51431001, 51271078 & U120124, Guangdong Natural Science Foundation Nos. 10151064101000013, 2014A030313222 & 2014A030311004, GDUPS (2014), and International Science & Technology Cooperation Program of China No. 2015DFA51750.

About author: To whom correspondence should be addressed, Tel: (020)87112830, E-mail: mehwang@scut.edu.cn

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	Jiangwen LIU
	Changcheng ZOU
	Hui WANG
	Liuzhang OUYANG
	Meiqin ZENG
	Min ZHU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.189 OR https://www.cjmr.org/EN/Y2016/V30/I4/248

Fig.1 BSE micrograph showing the microstructure of the as cast Mg₉₄Cu₄Y₂ alloy

Fig.2 Fine structure of Mg₉₄Cu₄Y₂ (a) typical BF TEM image showing the LPSO and adjacent Mg₂Cu; (b) HRTEM micrograph of 14H-LPSO and inset showing corresponding SAEDP indexed zone axis

[11 2 ? 0] LPSO

; (c) HRTEM micrograph of 18R-LPSO and corresponding SAEDPs indexed zone axis [010]_LPSO; and (d) Mg and Mg₂Cu with inset of corresponding SAEDP

Fig.3 XRD patterns of the alloy in the states of as cast, hydrogenated and dehydrogenated, respectively

Fig.4 TEM micrographs of dehydrogenated Mg₉₄Cu₄Y₂, (a) Morphology; (b) Selected area electron diffraction patterns taken from (a); (c) TEM dark field image of Mg₂Cu using reflection {022}; (d) HRTEM micrograph of Mg, YH₂, Mg₂Cu and MgCu₂ particles

Fig.5 Isothermal hydrogenation curves of the dehydrogenated sample under 2 MPa hydrogen pressure at 200, 250, 280, 300 and 350°C, respectively

Fig.6 Isothermal dehydrogenation curves of the hydrogenated sample at 250, 280, 300, and 350℃, respectively

Fig.7 Sketch showing the microstructural mechanism of Mg₉₄Cu₄Y₂ Alloy during the hydrogenation and dehydrogenation

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