Transformation of Metallic Ti to TiH Phase in the Ti/MgH Composite and Its Influence on the Hydrogen Storage Behavior of MgH.

The current work explores the in-situ formation of TiH additive in a Ti/MgH nanocomposite system. Mild mechanical milling leaves Ti chemically unchanged, while formation of stable TiH occurs upon strong mechanical milling. TiH further transforms to TiH upon recycling the powder (dehydrogenation and subsequent hydrogenation) and lowers the activation energy of MgH to 89.

Dehydrogenation Properties of Magnesium Hydride Loaded with Fe, Fe-C, and Fe-Mg Additives.

This study highlights that Fe additives offer better catalytic properties than carbon, Fe-C (iron carbide/carbon composites), and Fe-Mg (Mg FeH ) additives for the low-temperature dehydrogenation of magnesium hydride. The in situ X-ray diffraction measurements prove the formation of a Mg FeH phase in iron additive loaded MgH . Nonetheless, differential scanning calorimetry data suggest that this Mg FeH phase does not have any influence on dehydrogenation properties of MgH .

Formation of Mgx Nby Ox+y through the Mechanochemical Reaction of MgH2 and Nb2O5, and Its Effect on the Hydrogen-Storage Behavior of MgH2.

The present study aims to understand the catalysis of the MgH2 -Nb2 O5 hydrogen storage system. To clarify the chemical interaction between MgH2 and Nb2 O5 , the mechanochemical reaction products of a composite mixture of MgH2 +0.167 Nb2 O5 was monitored at different time intervals (2, 5, 15, 30, and 45 min, as well as 1, 2, 5, 10, 15, 20, 25, and 30 h).