Catalytic effect of nano-sized ScH2 on the hydrogen storage of mechanically milled MgH2

被引：22
作者：
Luo, Xuanli [1 ]
Grant, David M. [1 ]
Walker, Gavin S. [1 ]
机构：
[1] Univ Nottingham, Fac Engn, Mat Mech & Struct Res Div, Nottingham NG7 2RD, England
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 622卷
基金：
英国工程与自然科学研究理事会;
关键词：
Hydrogen storage; Magnesium; Catalyst; Scandium hydride; Kinetics; Cycling stability; ABSORPTION PROPERTIES; MAGNESIUM; SORPTION; DEHYDROGENATION; METALS;
D O I：
10.1016/j.jallcom.2014.10.161
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The hydrogen storage properties of ball milled xMgH(2)/(1 - x)ScH2 (x = 0.65-1) samples including capacity, kinetics, thermodynamics and cycling stability, were investigated. The effect of ScH2 catalyst content and ball milling duration on the kinetics of MgH2 dehydrogenation were studied. It was found that the optimal content of the catalyst ScH2 was ca. 12 mol.%, which gave an activation energy (E-a) value of 62 +/- 5 kJ mol (1) and a hydrogen storage capacity of 5.8 +/- 0.1 wt.% for the sample. There was no loss in kinetics in the ScH2 catalysed MgH2 system even after cycling at relatively high temperatures up to 450 degrees C, and the nano-sized ScH2 (ca. 70 nm) formed during ball milling remained after (de) hydrogenation cycling. Typical MgH2 dehydrogenation enthalpy (76 +/- 1 kJ mol (1) (H-2)) and entropy (138 +/- 2 J mol (1) K (1) (H-2)) values observed by the 0.65MgH(2)/0.35ScH(2) sample demonstrated the effect of ScH2 was purely a catalytic improvement of the kinetics. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：842 / 850
页数：9
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