Structure and Properties of Magnesium-Based Hydrogen Storage Alloys
| Periodical | Materials Science Forum (Volumes 567 - 568) |
|---|---|
| Main Theme | Materials Structure & Micromechanics of Fracture V |
| Edited by | Pavel Šandera |
| Pages | 217-220 |
| DOI | 10.4028/www.scientific.net/MSF.567-568.217 |
| Citation | Pavel Novák et al., 2007, Materials Science Forum, 567-568, 217 |
| Online since | December, 2007 |
| Authors | Pavel Novák, Dalibor Vojtěch, Filip Průša, Jan Šerák, Thomáš Fabián |
| Keywords | Hydrogen Storage, Magnesium Alloy, Microstructure |
| Price | US$ 28,- |
Hydrogen is the promising pollutant-free fuel of the near future. For various hydrogen applications, suitable storage systems have to be developed. One of the safe ways is the reversible storage of hydrogen in the form of light metal (lithium or magnesium) hydrides. MgH2 magnesium hydride shows very high storage capacity (approx. 7 wt. %), but its problem is high thermodynamic stability. Therefore, high temperature (over 400°C) is necessary for MgH2 to decompose producing hydrogen. The solution of this problem can be the utilization of the complex magnesium hydrides containing nickel, copper or other transition metals. In this work, the microstructure and hydrogen storage properties of the various magnesium alloys (Mg-Ni, Mg-Zn, Mg-Cu and Mg-Cu-Al) are described. The aim was to find suitable hydrogen storage system with good storage capacity and sufficient rate of formation and decomposition of hydrides. Microstructure, chemical and phase composition of the alloys were determined by the light and scanning electron microscopy, EDS and XRD. Hydrogen saturation was carried out by cathodic polarization in the alkaline solution. Hydrogen content in the material was estimated by XRD from the shift of the diffraction lines of present phases.
