期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 39, 期 18, 页码 9924-9930出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.02.022
关键词
Hydrogen storage; Magnesium hydride; Pellet; Diffusion; Scanning electron microscopy (SEM)
资金
- project HYDROSTORE - Italian Industria Program
- European COST action Nanostructured materials for solid-state hydrogen storage [MP1103]
Materials to be used in tanks for hydrogen storage should have suitable thermal properties otherwise their performances in term of kinetics and hydrogen capacity would rapidly decrease during exercise. For these reason in this work ball milled powders of MgH2 with Nb2O5 as catalyst and Expanded Natural Graphite (ENG) have been compacted at different pressures in the range between 100 and 600 MPa. The pellets were tested until SO cycles after which the material was able to absorb and desorb hydrogen without significant reduction in maximum capacity. The mechanical stability of these compacted systems during repeated cycling under hydrogen pressure is discussed together with the modifications of the microstructure. The compaction pressure revealed to affect largely the distribution of ENG in the pellets and their mechanical stability upon cycling while this parameter have only a slight effect on the sorption kinetics. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and volumetric Sievert's type apparatus have been used to characterize the samples. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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