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Korean Journal of Metals and Materials > Volume 56(2); 2018 > Article
Korean Journal of Metals and Materials 2018;56(2): 155-162. doi: https://doi.org/10.3365/KJMM.2018.56.2.155
Hydrogen Absorption and Release Properties of MgH2, Mg2Ni, and Ni-Added Mg via Reactive Mechanical Grinding
Seong-Hyeon Hong1, Myoung Youp Song2
1Small and Medium Sized Corporate Supporting Department, Korea Institute of Materials and Science (KIMS), Changwon 51508, Republic of Korea
2Division of Advanced Materials Engineering, Research Center of Advanced Materials Development, 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: 16 August 2017;  Accepted: 29 September 2017.  Published online: 5 February 2018.
In this work, MgH2, Mg2Ni, and Ni were added to Mg in order to improve the hydrogen-storage properties of Mg. A 84 wt% Mg + 10 wt% MgH2 + 5 wt% Mg2Ni + 1 wt% Ni sample (designated the Mg-based sample) was prepared by milling under a hydrogen atmosphere in a planetary ball mill for 5 h. The hydrogen absorption and release properties of the prepared sample were investigated and compared with those of a 94 wt% MgH2 + 5 wt% Mg2Ni + 1 wt% Ni sample (the MgH2-based sample). The Mg-based sample had larger quantities of hydrogen absorbed and released for 60 min than the MgH2-based sample. The Mg-based sample had an effective hydrogen-storage capacity (the quantity of hydrogen absorbed for 60 min) of near 5.7 wt%. At n = 2, the Mg-based sample absorbed 5.18 wt% for 2 min, 5.57 wt% for 10 min, and 5.67 wt% for 60 min at 648 K. At n = 1, the Mg-based sample released 0.083 wt% for 2 min, 5.13 wt% for 10 min, and 5.49 wt% for 60 min at 648 K. The addition of MgH2, Mg2Ni, and Ni to Mg had stronger effects than the addition of Mg2Ni and Ni to MgH2. It is believed that the effects of the reactive mechanical grinding (reducing the Mg particle size, making clean surfaces, and creating defects) are stronger in the Mg-based sample than in the MgH2-based sample.
Keywords: hydrogen storage, magnesium, mechanical milling, X-ray diffraction, MgH2 Mg2Ni or Ni addition.
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