한국수소및신에너지학회논문집 (Transactions of the Korean hydrogen and new energy society)

  • 제28권3호
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  • Pages.238-245
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  • 2017
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  • 1738-7264(pISSN)
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  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
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Mg-Ni 금속 간 화합물 나노입자의 형성과 수소저장 특성

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)
  • 투고 : 2017.03.30
  • 심사 : 2017.06.30
  • 발행 : 2017.06.30
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초록

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.

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