Journal
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
Volume 30, Issue 1, Pages 65-69Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2005.10.002
Keywords
binary hydride; complex metal hydride; thermal decomposition; hydrogen storage materials; thermodynamic calculation
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Some alkali and alkali-earth metal hydrides and their complex hydrides have very high hydrogen storage capacities and reversibility. Unfortunately, most of them have decomposition temperatures that are too high. This must be overcome before these hydrides can be considered seriously as practical hydrogen storage materials for on-board applications. In the present study, the CALPHAD approach has been adopted to evaluate thermodynamically the possibility of destabilizing these high temperature binary ionic hydrides and ternary complex hydrides by reacting them with light elements or other hydrides. The MgH2 + Si, LiBH4 + MgH2, and LiBH4 +Al systerns are predicted to show a significant decrease in decomposition temperature. On the other hand, the decrease in the decomposition temperatures of the MgH2 + Al and NaBH4 + Al systems is relatively small. The LiH + Si system also presents a considerable destabilization effect, which is consistent with experiment. (c) 2005 Elsevier Ltd. All rights reserved.
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