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http://dx.doi.org/10.7316/KHNES.2017.28.3.238

Formation and Hydrogen Absorption Properties of Intermetallic Mg-Ni Compound Nanoparticles  

BAE, YOOGEUN (Department of Mechanical Engineering, Graduate School Kumoh National Institute of Technology)
HWANG, CHULMIN (School of Engineering, Nagasaki University)
KIM, JONGSOO (Busan Technical Center of Automotive Parts, Korea Institute of Mechinery & Materials)
DONG, XING LONG (School of Materials Science and Engineering, Dalian University of Technology)
KIM, SEWOONG (Department of Mechanical Engineering, Kumoh National Institute of Technology)
JUNG, YOUNGUAN (Department of Mechanical Engineering, Kumoh National Institute of Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.28, no.3, 2017 , pp. 238-245 More about this Journal
Abstract
Mg-Ni nanoparticles were synthesized by a physical vapor condensation method (DC arc-discharge) in a mixture of argon and hydrogen atmosphere, using compressed mixture of micro powders as the raw materials. The crystal phases, morphology, and microstructures of nanoparticles were analyzed by means of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). It was found that the intermetallic compounds of $Mg_2Ni$ and $Mg_2Ni$ formed with existence of phases of Mg, Ni, and MgO in Mg-Ni nanoparticles. After one cycle of hydrogen absorption/desorption process (activation treatment), Mg-Ni nanoparticles exhibited excellent hydrogen absorption properties. $Mg_2Ni$ phase became the main phase by aphase transformation during the hydrogen treatments. The phenomenon of refinement of grain size in the nanoparticle was also observed after the hydrogen absorption/desorption processes, which was attributed to the effect of volume expansion/shrinkage and subsequent break of nanoparticles. Maximum hydrogen absorption contents are 1.75, 2.21 and 2.77 wt.% at 523, 573 and 623 K, respectively.
Keywords
Mg-Ni nanoparticles; Intermetallic compound; Arc discharge; Hydrogen; Storage;
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