Mg-Ni 금속 간 화합물 나노입자의 형성과 수소저장 특성

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 28; no. 3; pp. 238 - 245
• Main Authors: 배유근, 황철민, 김종수, 동성룡, 김세웅, 정영관, BAE, YOOGEUN, HWANG, CHULMIN, KIM, JONGSOO, DONG, XING LONG, KIM, SEWOONG, JUNG, YOUNGUAN
• Format: Journal Article
• Language: Korean
• Published: 2017
• Subjects: Mg-NI
• ISSN: 1738-7264

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.