Structure, morphology and hydrogen storage kinetics of nanocomposite MgH2/10 wt% ZrNi5 powders

被引:50
作者
El-Eskandarany, M. Sherif [1 ]
Shaban, Ehab [1 ]
Al-Matrouk, Hasan [1 ]
Behbehani, Montaha [1 ]
Alkandary, Abdullah [1 ]
Aldakheel, Fahad [1 ]
Ali, Naser [1 ]
Ahmed, S. A. [1 ]
机构
[1] Kuwait Inst Sci Res, Energy & Bldg Res Ctr, Nanotechnol & Adv Mat Program, Safat 13109, Kuwait
关键词
Reactive ball milling; Mechanical milling; Metal hydrides; Zr alloys; Hydrogenation/dehydrogenation; Cycle-life-time; MAGNESIUM; TITANIUM;
D O I
10.1016/j.mtener.2016.12.002
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
Reactive ball milling was employed to synthesize nanocrystalline MgH2 powders under a hydrogen gas pressure of 50 bar for 200 h, using a high-energy ball milling. In part to improve the hydrogen absorption/desorption kinetics of as-prepared MgH2, the powders were doped with 10 wt% ZrNi5 powders and then mechanically ball milled for 50 h. The nanocomposite powders possessed superior hydrogenation/dehydrogenation properties, indexed the short time required for achieving a complete hydrogen absorption (1 min) and desorption (10-12 min) of 5.3 wt% H-2 at 275 degrees C. van't Hoff approach was used to calculate the enthalpy of hydrogenation and dehydrogenation for MgH2 phase in the nanocomposite powders and found to be -72.85 and 77.07 kJ/mol, respectively. Moreover, this nanocomposite system possessed excellent hydrogen absorption/desorption cyclability of 600 complete cycles, conducted at 275 degrees C with a cyclic-life-time reached to 568 h without serious kinetics degradation. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:60 / 71
页数:12
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