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Korean Journal of Metals and Materials > Volume 56(1); 2018 > Article
Korean Journal of Metals and Materials 2018;56(1): 59-65. doi: https://doi.org/10.3365/KJMM.2018.56.1.59
Enhancement of the Hydrogen-Storage Characteristics of Mg by Adding Mg2Ni and Ni to MgH2 via High Energy Ball Milling in Hydrogen Atmosphere
Seong-Hyeon Hong1, Young Jun Kwak2,3, Myoung Youp Song3
1Small and Medium Sized Corporate Supporting Department, Korea Institute of Materials and Science (KIMS), Changwon 51508, Republic of Korea
2Department of Materials Engineering, Graduate School, 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: 10 April 2017;  Accepted: 28 July 2017.  Published online: 1 January 2018.
In this work, Mg2Ni and Ni were added to MgH2 in order to improve the hydrogen-storage properties of Mg. A 94 wt% MgH2+5 wt% Mg2Ni+1wt% Ni (named 94MgH2+5Mg2Ni+1Ni) sample was prepared by milling in a hydrogen atmosphere in a planetary ball mill for 5 h. The Mg2Ni was hydrided during milling in a hydrogen atmosphere. The 94MgH2+5Mg2Ni+1Ni had an effective hydrogen-storage capacity (the quantity of hydrogen absorbed for 60 min) of near 5 wt%. At n=1, the sample released 0.18 wt% for 2 min, 2.14 wt% for 5 min, 4.65 wt% for 10 min, and 5.46 wt% for 60 min at 648 K. The reactive mechanical grinding of MgH2 with Mg2Ni and Ni is believed to facilitate nucleation (by creating defects, which serve as active sites for nucleation, on the surfaces and inside the Mg particles), increase reactivity with hydrogen (by making clean surfaces), and decrease the diffusion distances of hydrogen atoms (by reducing the particle size of Mg).
Keywords: hydrogen absorbing materials, mechanical milling, hydrogen, X-ray diffraction, Mg2Ni and Ni addition
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