Thermodynamic Properties of Mg-Ni-H Compounds Prepared Assisted by a High Magnetic Field

Abstract

The Mg2NiH4 hydrogen storage material was prepared by magnetic field assisted combustion synthesis (MACS). It is found that the high magnetic field promotes the formation of Mg2NiH4. The high pressure differential scanning calorimetry (HPDSC) test results indicate that the optimum hydriding and dehydriding onset temperatures are 434 K and 525 K, respectively. However, the peak temperatures associated with LT à HT are similar for all samples. The Vant Hoff results show that a high magnetic field has no obvious effect on the entropies and enthalpies of these compounds.