Nucleation and growth behaviors of hydriding and dehydriding reactions of Mg2Ni

被引:13
|
作者
Park, Hye Ryoung [1 ]
Kwak, Young Jun [2 ]
Song, Myoung Youp [3 ]
机构
[1] Chonnam Natl Univ, Sch Chem Engn, 77 Yongbong Ro, Gwangju 61186, South Korea
[2] Chonbuk Natl Univ, Grad Sch, Dept Mat Engn, 567 Baekje Daero, Jeonju 54896, South Korea
[3] Chonbuk Natl Univ, Hydrogen & Fuel Cell Res Ctr, Engn Res Inst, Div Adv Mat Engn, 567 Baekje Daero, Jeonju 54896, South Korea
关键词
Hydrides; Intermetallic compounds; Metals; Microstructure; High pressure; HYDROGEN SORPTION PROPERTIES; ADDED MAGNESIUM HYDRIDE; KINETICS; STORAGE; SYSTEM; TRANSITION; ALLOYS; NI; THERMODYNAMICS; ABSORPTION;
D O I
10.1016/j.materresbull.2017.10.041
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Mg2Ni has drawn attention due to its high reaction rates, good reversibility, and possibility to be applied as a negative electrode in the Ni-MH (metal hydride) batteries. Mg2Ni samples were prepared by sintering under Ar in a stainless-steel crucible at 823 K. Johnson-Mehl equation for nucleation and growth mechanism was applied to the behaviors of hydriding and dehydriding reactions of Mg2Ni. At 571 K under 30 bar H-2, the activation of the Mg2Ni sample was completed at the number of cycles of three (n = 3). At n = 3, hydrided fractions of the sample were 0.51 (1.92 wt% H) at 0.50 min and 0.90 (3.38 wt% H) at 2.00 min. Reverse temperature dependences of the initial hydriding rate and the quantity of hydrogen absorbed for 60 min appeared from 571 K to 620 K. Hydriding and dehydriding reactions progressed by the nucleation and growth mechanism and could be expressed by the Johnson-Mehl equation.
引用
收藏
页码:23 / 28
页数:6
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