A study of stability of MgH2 in Mg-8at%Al alloy powder

被引：40

作者：

Tanniru, Mahesh ^{[1
]}

Slattery, Darlene K. ^{[2
]}

Ebrahimi, Fereshteh ^{[1
]}

机构：

[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

[2] Florida Solar Energy Ctr FSEC, Cocoa, FL USA

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 08期

基金：

美国国家科学基金会;

关键词：

Magnesium hydride; Mg-Al alloy; Enthalpy; Microstructure; Hydrogenation; HYDROGEN STORAGE PROPERTIES; ABSORPTION PROPERTIES; LATTICE-PARAMETERS; MAGNESIUM HYDRIDE; AL; SORPTION; DEHYDROGENATION; DESORPTION; MECHANISM; MIXTURES;

D O I：

10.1016/j.ijhydene.2010.01.109

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：

To investigate the effect of Al addition on the stability of magnesium hydride, the hydrogenation characteristics of a Mg-8at%Al alloy powder synthesized using the electrodeposition technique were evaluated. The characterization of the hydrogenation behavior within the 180 degrees C-280 degrees C temperature range and the subsequent microstructural analysis elucidated that the amount of Al present in the hydride decreased with increasing temperature. This observation suggests that Al has very low solubility in magnesium hydride but Al can be accommodated in MgH2 by processing under non-equilibrium conditions. Pressure-composition isotherms were developed at different temperatures for the Mg-Al powder as well as pure Mg powder. The results indicate that the enthalpy of formation was slightly lower for the Mg-8at%Al powder while the enthalpy of dissociation did not change. The absence of noticeable influence of Al addition on the stability of magnesium hydride is attributed to its lack of solubility. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

引用

页码：3555 / 3564

页数：10

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