A new type of Mg-based metal hydride with promising hydrogen

被引：85
作者：
Ouyang, L. Z.
Dong, H. W.
Peng, C. H.
Sun, L. X.
Zhu, M. [1 ]
机构：
[1] S China Univ Technol, Coll Mech Engn, Guangzhou 510641, Guangdong, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem Phys, Mat & Thermochem Lab, Dalian 116023, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2007年 / 32卷 / 16期
基金：
中国国家自然科学基金;
关键词：
magnesium; hydrogen storage; rare earth; induction melting;
D O I：
10.1016/j.ijhydene.2007.05.026
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Three Mg3RE (rare earth abbreviated as RE) compounds were prepared in Mg-La, Mg-Nd and Mg-misch metal (abbreviated as Mg-Mm) systems by induction melting. XRD patterns show that the as melted Mg3RE compounds have the D0(3) structure. The lattice constants of Mg3La, Mg(3)Mm and Mg3Nd phases are 0.7498, 0.7451 and 0.7390nm, respectively. The lattice constants of the new hydride phases formed from Mg3La and Mg3Nd during the hydrogenation process with fcc structure are 0.5607 and 0.5598nm, respectively. The alloys have good hydrogen storage properties and could absorb hydrogen at room temperature with rapid hydriding and dehydriding kinetics. The maximum hydrogen absorption content Of Mg3La, Mg(3)Mm and Mg3Nd alloys are 2.89, 2.58 and 1.95 wt%, respectively. The enthalpy (Delta H) and entropy (AS) Of Mg3RE-H dehydriding reaction were also determined. Hydrogen absorption kinetic curves measured at room temperature could be well fitted by the Avrami-Erofeev equation. (c) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：3929 / 3935
页数：7
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