[논문]Mg-Ni 금속 간 화합물 나노입자의 형성과 수소저장 특성

배유근; 황철민; 김종수; 동성룡; 김세웅; 정영관

doi:10.7316/khnes.2017.28.3.238

Mg-Ni 금속 간 화합물 나노입자의 형성과 수소저장 특성
Formation and Hydrogen Absorption Properties of Intermetallic Mg-Ni Compound Nanoparticles 원문보기

한국수소 및 신에너지학회 논문집 = Transactions of the Korean Hydrogen and New Energy Society, v.28 no.3, 2017년, pp.238 - 245

배유근 (금오공과대학교 대학원) , 황철민 (나가사키대학) , 김종수 (한국기계연구원) , 동성룡 (대련이공대학교) , 김세웅 (금오공과대학교) , 정영관 (금오공과대학교)

Abstract ▼ AI-Helper

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.

주제어

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문제 정의

In this work, Mg-Ni nanoparticles were in situ synthesized by a modified arc-discharge method and the hydriding/dehydriding properties were explored by a volumetric method. The main purpose of this investigation is to gain some understanding on hydrogen storage kinetic and thermodynamic properties of Mg-Ni nanoprticles.

제안 방법

Micron-sized Mg and Ni powders (99% purity) as the raw materials were weighed prorata and compressed into acylindrical block which served as the anode to be evaporated. A series of the compacted master blocks were prepared with different molar ratios of Mg to Ni (2:1, 1:1, and 1:2), and the resultant nanoparticles were labeled as sample (A)-(C), respectively. After the chamber was evacuated, a mixture of hydrogen and argon was introduced as the source of hydrogen plasma and a condensing atmosphere.
Considering the large difference in vapor pressure and melting point between Mg and Ni, it is difficult to obtain Mg₂Ni by conventional melting method or vacuum arc melting technique. In this work, Mg-Ni nanoparticles were in situ synthesized by a modified arc-discharge method and the hydriding/dehydriding properties were explored by a volumetric method. The main purpose of this investigation is to gain some understanding on hydrogen storage kinetic and thermodynamic properties of Mg-Ni nanoprticles.

성능/효과

A trace of Mg(OH)₂ was observed in the as-prepared nanoparticles sample (A), which may be attributed to the reaction between MgO and H₂O vapor as nanoparticles were exposed to air. It is indicated from the experimental results that the single phase of Mg₂Ni was difficult to beformed by co-evaporating Mg and Ni raw materials, although the stoichiometric composition of master bulk was set as the molar ratio of 2:1 for Mg and Ni. In present preparation, the thermal non-equilibrium condition and the significant difference between melting points of Mg and Ni would result in the complex phase constitution.
In this study, Mg-Ni nanoparticles are prepared by arc discharge using micro-sized metallic powders as the raw materials. It was found that the intermetallic compounds of Mg₂Ni and MgNi₂ are generated and coexist with the phases of Mg, Ni, and MgO in nanoparticles. Mg-Ni nanoparticles exhibit excellent kinetic properties after only one hydrogen absorption/desorption cycle.

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