Hydrogen-storage characteristics of Cu, Nb2O5, and NbF5-added Mg-Ni alloys

被引：4

作者：

Hong, Seong-Hyeon ^{[2
]}

Kwon, Sung Nam ^{[3
]}

Kwak, Young Jun ^{[4
]}

Song, Myoung Youp ^{[1
]}

机构：

[1] Chonbuk Natl Univ, Div Adv Mat Engn, Dept Hydrogen & Fuel Cells, Res Ctr Adv Mat Dev,Engn Res Inst, Jeonju 561756, Jeonbuk, South Korea

[2] Korea Inst Machinery & Mat, Powder Mat Technol Grp, KIMS, Chang Won 641831, Gyeongnam, South Korea

[3] Chonbuk Natl Univ, Dept Hydrogen & Fuel Cells, Grad Sch, Jeonju 561756, Jeonbuk, South Korea

[4] Chonbuk Natl Univ, Dept Mat Engn, Grad Sch, Jeonju 561756, Jeonbuk, South Korea

来源：

MATERIALS RESEARCH BULLETIN | 2012年 / 47卷 / 02期

关键词：

Alloys; Hydrides; Electron microscopy; X-ray diffraction; Microstructure; MAGNESIUM; KINETICS; HYDRIDE; NICKEL; NBF5;

D O I：

10.1016/j.materresbull.2011.11.051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

From a Mg-23.5 wt%Ni-5 wt%Cu alloy synthesized by the gravity casting method in a large quantity (7.5 kg), Mg-23.5 wt%Ni-x wt%Cu (x = 2.5, 5 and 7.5) samples for hydrogen storage were prepared by melt spinning and crystallization heat treatment. The samples were ground under H-2 in order to obtain a fine powder. These alloys contained crystalline Mg and Mg2Ni phases. The Mg-23.5Ni-2.5Cu alloy had the highest hydriding and dehydriding rates after activation among these alloys. The dehydriding curve under 1.0 bar H-2 at 573 K exhibits two stages: the dehydriding rate is high for about 2.5 min (the decomposition of Mg2Ni hydride and Mg hydride in small particles), and then it becomes lower (the decomposition of Mg hydride). The hydriding and dehydriding properties of another sample 88 wt%(87.5Mg-10Ni-2.5Cu)-5 wt%Nb2O5-7 wt%NbF5 were also investigated. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：172 / 178

页数：7