Mg composites for hydrogen storage The dependence of hydriding properties on composition

Mg–Ni–Cu mixtures for hydrogen storage: A kinetic study

“…For this reason, in the last years several Mg-Ni compositions (with Ni content up to 50 wt%) were explored, in the attempt to balance the hydrogen capacity and the sorption rates from the viewpoint of reversible storage [16]. Moreover, it was shown that the addition of a third component, such as another transition metal [17][18][19] or a rare earth metal [20,21], can further improve the hydrogenation kinetics of the storage systems.…”

Dehydrogenation kinetics of pure and nickel-doped magnesium hydride investigated by in situ time-resolved powder X-ray diffraction

“…Thermodynamics dictate that relatively high temperatures (T > 280 • C) must be applied to desorb H 2 from pure MgH 2 due to a formation enthalpy of MgH 2 of, H f = −75 kJ/mol [4]. Furthermore, investigations have shown that kinetics can be improved remarkably either by reduction of the particle size by ball milling, by mechanical alloying or sputter deposition of other elements or by doping with carbon [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In this way, the kinetics can be improved by reducing the diffusion path of hydrogen atoms in Mg and MgH 2 , facilitating the diffusion process or by adding catalysts on the metal surface for the dissociation or formation of H 2 molecules.…”

Preparation and characterization of carbonaceous material-based hydrogen absorbing composites

“…However, the milling may destroy the crystal structure of graphite or surface structure of carbon black so that their abilities to sorb hydrogen might also decrease at certain milling time. The benefits of mechanical milling are to produce nanocrystalline/amorphous materials [10,11]; to produce fresh and highly reactive surfaces [12]; to form nanocomposite by mixing with another element/compound [13,14] and to form several alloys/hydride phases [15,16].…”