Hydrogen storage properties of Mg–Ce–Ni nanocomposite induced from amorphous precursor with the highest Mg content

Controlling nanocrystallization and hydrogen storage property of Mg-based amorphous alloy via a gas-solid reaction

“…The activation energy of desorption for the 15th hydrogenated A 4 sample is calculated to be 87±7 kJ/mol, which are smaller than that of the 15th hydrogenated A 3 sample of 98±8 kJ/mol (see Fig. S4), hydrogenated induction-melt Mg-Ce-Ni alloy of 124.6 kJ/mol [32] and commercial MgH 2 of ~160 kJ/mol [41]. Fig.…”

“…We wish to further increase the H 2 pressure and lower the temperature, but could not realize due to the lab facility limitation. Mg 2 NiH 4 and CeH 2.73 have been well established to show catalytic effect on hydrogen storage property of MgH 2 , and the finer particles possess higher catalytic activity than that with coarser particles [32,34]. Fig.…”

“…Preparation details of the amorphous Mg-Ce-Ni ribbons were described elsewhere [32,37]. The amorphous ribbons with ~3 mm in width and ~50 µm in thickness were crushed into powder via ball milling at a speed of 200 rpm (QM-3SP4J, Nanjing University).…”

“…The melt-spun Mg-based alloys present remarkably improved hydrogen storage kinetics compared with those of the induction-melt alloys [32], owing to their nanostructure together with dislocations and grain boundaries in the multi-phase composites containing catalytic REH x and Mg 2 NiH 4 that facilitate the hydrogen diffusion and dissociation [33]. Zhang et al [34] comparatively studied the hydrogen storage properties of melt-spun Mg 10 NiRE alloys and found that the hydrogen M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 4 absorption/desorption kinetics were mainly influenced by the particle size but not the species of the REH x , and hydrides with finer particle displays faster kinetics than those with coarser particle.…”

Improvement in hydrogen storage properties of MgH2catalyzed with BaTiO3additive

“…Furthermore, the results shows that BaTiO 3 remains stable after ball-milling, hydriding and dehydriding processes, indicating that there are no reaction between BaTiO 3 and MgH 2 , but BaTiO 3 play a catalyst role during the hydriding/dehydriding process of MgH 2 , which result in the decrease in desorption temperature and improvement in kinetics of MgH 2 . According to the research results of Lin et al, the Ti-based catalysts owing to special electron distribution help in particle transfer in chemical reactions and have been applied in many chemical processing [27]. Therefore, BaTiO 3 play a catalytic role in the hydrogenation/dehydrogenation reactions of MgH 2 , which helps to improve the hydrogen storage properties of MgH 2 .…”