Microstructural study of hydrogen desorption in 2NaBH4 + MgH2 reactive hydride composite

被引：15

作者：

Nwakwuo, Christopher C. ^{[1
]}

Pistidda, Claudio ^{[2
]}

Dornheim, Martin ^{[2
]}

Hutchison, John L. ^{[1
]}

Sykes, John M. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[2] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, D-21502 Geesthacht, Germany

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2012年 / 37卷 / 03期

关键词：

Hydrogen storage; Sodium boro-hydride; Magnesium hydride; Reaction mechanism; Scanning electron microscopy; Transmission electron microscopy; REACTIVE HYDRIDE COMPOSITES; TEM CHARACTERIZATION; MAGNESIUM HYDRIDE; STORAGE; MGH2; SEM;

D O I：

10.1016/j.ijhydene.2011.10.070

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 desorption mechanism of as-milled 2NaBH(4) + MgH2 was investigated by volumetric analysis, X-ray diffraction and electron microscopy. Hydrogen desorption was carried out in 0.1 bar hydrogen pressure from room temperature up to 450 degrees C at a heating rate of 3 degrees C min(-1). Complete dehydrogenation was achieved in two steps releasing 7.84 wt.% hydrogen. Desorption reaction in this system is kinetically restricted and limited by the growth of MgB2 at the Mg/Na2B12H12 interface where the intermediate product phases form a barrier to diffusion. During desorption, MgB2 particles are observed to grow as plates around NaH particles. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：2382 / 2387

页数：6

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