Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7722632 | International Journal of Hydrogen Energy | 2013 | 10 Pages |
Abstract
Among different Reactive Hydride Composites (RHCs), the combination of LiBH4 and MgH2 is a promising one for hydrogen storage, providing a high reversible storage capacity. During desorption of both LiBH4 and MgH2, the formation of MgB2 lowers the overall reaction enthalpy. In this work, the material was compacted to pellets for further improvement of the volumetric hydrogen capacity. The influence of compaction pressure on the apparent density, thermal conductivity and sorption behaviour for the Li-based RHC during cycling was investigated for the first time. Although LiBH4 melts during cycling, decrepitation or disaggregation of the pellets is not observed for any of the investigated compaction pressures. However, a strong influence of the compaction pressure on the apparent hydrogen storage capacity is detected. The influence on the reaction kinetics is rather low. To provide explanations for the observed correlations, SEM analysis before and after each sorption step was performed for different compaction pressures. Thus, the low hydrogen sorption in the first cycles and the continuously improving sorption for low pressure compacted pellets with cycling may be explained by some surface observations, along with the form stability of the pellets.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Julian Jepsen, Chiara Milanese, Alessandro Girella, Gustavo A. Lozano, Claudio Pistidda, José M. Bellosta von Colbe, Amedeo Marini, Thomas Klassen, Martin Dornheim,