Effect of LiBH4 on hydrogen storage property of MgH2

被引：34

作者：

Pan, Yanbiao ^{[1
]}

Leng, Haiyan ^{[1
]}

Wei, Jia ^{[1
]}

Li, Qian ^{[1
]}

机构：

[1] Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2013年 / 38卷 / 25期

基金：

中国国家自然科学基金;

关键词：

Hydrogen storage materials; MgH2; LiBH4; Ball milling; H-H exchange; KINETICS; NB2O5; ABSORPTION; ALLOYS; SYSTEM;

D O I：

10.1016/j.ijhydene.2013.06.079

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 effect of lithium borohydride (LiBH4) on the hydriding/dehydriding kinetics and thermodynamics of magnesium hydride (MgH2) was investigated. It was found that LiBH4 played both positive and negative effects on the hydrogen sorption of MgH2. With 10 mol.% LiBH4 content, MgH2-10 mol.% LiBH4 had superior hydrogen absorption/desorption properties, which could absorb 6.8 wt.% H within 1300 s at 200 degrees C under 3 MPa H-2 and completed desorption within 740 s at 350 degrees C. However, with the increasing amount of LiBH4, the hydrogenation/dehydrogenation kinetics deteriorated, and the starting desorption temperature increased and the hysteresis of the pressure-composition isotherm (PCI) became larger. Our results showed that the positive effect of LiBH4 was mainly attributed to the more uniform powder mixture with smaller particle size, while the negative effect of LiBH4 might be caused by the H H exchange between LiBH4 and MgH2. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：10461 / 10469

页数：9

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