Journal
SCRIPTA MATERIALIA
Volume 64, Issue 3, Pages 225-228Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2010.10.019
Keywords
Hydrogen storage; Differential scanning calorimetry; Metastable phases; Thermodynamics
Categories
Funding
- NSFC [20971009, 20821091, 51071003]
- MOST of China [2009CB939902, 2010CB631301]
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The conditions of formation of polyborane intermediate species of Mg(BH4)(2) during the partial dehydriding reaction and their properties have been experimentally investigated. A six step thermal decomposition pathway is first proposed. Hydrogen capacity, reaction enthalpy and activation energy values of each step are calculated to discuss the thermodynamically determined decomposition temperature and the kinetic barriers. In addition, a metastable MgB2H6 phase, which was previously predicted from density functional theory calculations, is confirmed by pressure-content isotherm measurements carried out at 277 C. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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