Stability investigation of the γ-MgH2 phase synthesized by high-energy ball milling

Improvement of hydrogen storage characteristics of catalyst free magnesium nanoparticles prepared by wet milling

“…γ‐MgH 2 crystallises in an orthorhombic α‐PbO 2 ‐type structure. Earlier investigation also depicts that mechanochemical treatment can give rise to formation of the metastable γ‐MgH 2 phase along with tetragonal α‐MgH 2 phase [50,51]. Another high pressure polymorph called β‐MgH 2 with CaF 2 structure is also reported experimentally using in situ synchrotron diffraction [52], but in the present experimental condition it does not exist.…”

Interfacial Engineering of Fluorinated TiO2 Nanosheets with Abundant Oxygen Vacancies for Boosting the Hydrogen Storage Performance of MgH2

“…Compared with α‐MgH 2 , the γ phase was known to be less stable and more reactive, leading to the improved hydrogen storage performance. [ 21 ] However, no obvious catalyst phase was detectable throughout the entire two cycles, even in the MgH 2 +20 wt.% TiO 2‐x (F) composite, which may be attributed to the fine size of TiO 2‐x (F) (Figure S9, Supporting Information). Alternatively, several diffraction peaks of the catalyst were encapsulated in the Mg/MgH 2 main phase, since the raw MgH 2 was also impure.…”

Superior hydrogen performance of in situ formed carbon modified MgH2 composites

“…Moreover, the diffraction peak of the re-hydrogenated sample is much higher than that of the ball-milled sample, which is mainly due to the elimination of the micro-strain and the recrystallization of the samples during re-hydrogenation process. 27,28 There exists a primary phase transformation between MgH 2 and Mg during the dehydrogenated process, and MgH 2 is completely dehydrogenated to Mg. The diffraction peaks of Mg are clearly identied, accompanied by the disappearance of the MgH 2 peaks.…”