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Korean Journal of Metals and Materials > Volume 55(9); 2017 > Article
Korean Journal of Metals and Materials 2017;55(9): 657-663. doi: https://doi.org/10.3365/KJMM.2017.55.9.657
Increase in the Hydrogen-Sorption Rates and the Hydrogen-Storage Capacity of MgH2 by Adding a Small Proportion of Zn(BH4)2
Hye Ryoung Park1, Young Jun Kwak2, Myoung Youp Song3
1School of Chemical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
2Department of Materials Engineering, Graduate School, Hydrogen & Fuel Cell Research Center, Engineering Research Institute, Chonbuk National University, Jeonju 54896, Republic of Korea
3Division of Advanced Materials Engineering, Hydrogen & Fuel Cell Research Center, Engineering Research Institute, Chonbuk National University, Jeonju 54896, Republic of Korea
Correspondence  Myoung Youp Song ,Tel: +82-63-270-2379, Email: songmy@jbnu.ac.kr
Received: 20 February 2017;  Accepted: 29 May 2017.  Published online: 30 August 2017.
ABSTRACT
Abstract: 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, Hd, with temperature, T, for as-milled 99MgH2+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. 99MgH2+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, 99MgH2+ 1Zn(BH4)2 absorbed 3.97 wt% H in 5 min, 4.49 wt% H in10 min, and 4.83 wt% H in 60 min at 593 K under 12 bar H2.
Keywords: hydrogen absorbing materials, mechanical milling, hydrogen, thermal analysis, MgH2-based alloy
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