Increase in the Hydrogen-Sorption Rates and the Hydrogen-Storage Capacity of MgH2 by Adding a Small Proportion of Zn(BH4)2

被引:24
作者
Park, Hye Ryoung [1 ]
Kwak, Young Jun [2 ]
Song, Myoung Youp [3 ]
机构
[1] Chonnam Natl Univ, Sch Chem Engn, Gwangju 61186, South Korea
[2] Chonbuk Natl Univ, Engn Res Inst, Hydrogen & Fuel Cell Res Ctr, Dept Mat Engn,Grad Sch, Jeonju 54896, South Korea
[3] Chonbuk Natl Univ, Engn Res Inst, Hydrogen & Fuel Cell Res Ctr, Div Adv Mat Engn, Jeonju 54896, South Korea
来源
KOREAN JOURNAL OF METALS AND MATERIALS | 2017年 / 55卷 / 09期
关键词
hydrogen absorbing materials; mechanical milling; hydrogen; thermal analysis; MgH2-based alloy; NI; ALLOYS; MAGNESIUM; TI; KINETICS; HYDRIDE; NICKEL; LIBH4; NA;
D O I
10.3365/KJMM.2017.55.9.657
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this work, Zn(BH4)(2) was added to improve the hydrogen-storage properties of MgH2. A 99 wt% MgH2+1 wt% Zn(BH4)(2) sample was prepared by milling in a planetary ball mill in a hydrogen atmosphere. The proportion of the added Zn(BH4)(2) was small (1 wt%) in order to increase hydriding and dehydriding rates without reducing the hydrogen-storage capacity too much. Changes in the released hydrogen quantity, H-d, with temperature, T, for as-milled 99MgH(2)+1Zn(BH4)(2) was obtained by heating the sample from room temperature to 683 K with a heating rate of 5 K/min under 1.0 bar of gas. Activation of the sample was not required. 99MgH(2)+1Zn(BH4)(2) had an effective hydrogen-storage capacity (the quantity of hydrogen absorbed in 60 min) of 4.83 wt% in the first cycle. The as-purchased MgH2 absorbed hydrogen slowly, absorbing 0.04 wt% H in 60 min. On the other hand, in the first cycle, 99MgH(2)+ 1Zn(BH4)(2) absorbed 3.97 wt% H in 5 min, 4.49 wt% H in 10 min, and 4.83 wt% H in 60 min at 593 K under 12 bar H-2.
引用
收藏
页码:657 / 663
页数:7
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