Hydrogen sorption properties of MgH₂–NiCo₂O₄ composites activated mechanically under argon and hydrogen atmospheres

Tzveta Mandzhukova (1) , Jean-Louis Bobet (2) , Maria Khrussanova (1) , Pavel Peshev (1)

1 Institute of General and Inorganic Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The effect of the mechanical activation medium on the hydrogen absorption–desorption properties of MgH₂ with NiCo₂O₄ additives is investigated. The composite 90 wt.% MgH₂–10 wt.% NiCo₂O₄ mechanically activated for 180 min under hydrogen reaches a higher absorption capacity as compared to the composite ground for the same time in an argon medium. At T = 573 K and P = 1 MPa the composite activated mechanically in a reactive medium shows a value of 5.67 wt.% while for the composite ground under argon the value is 4.36 wt.% only, both samples preserving a high absorption capacity at temperatures below 573 K. Addition of nickel cobaltite is found to have a favorable effect on the hydriding kinetics of magnesium. In order to elucidate this effect, a composite containing a large amount of NiCo₂O₄ (50 wt.%) is also investigated.

Mots clés: Hydrides; X-ray diffraction; Hydrogen sorption; Inorganic compounds

Domaines: Matériaux

Tzveta Mandzhukova, Jean-Louis Bobet, Maria Khrussanova, Pavel Peshev. Hydrogen sorption properties of MgH₂–NiCo₂O₄ composites activated mechanically under argon and hydrogen atmospheres. Materials Research Bulletin, 2009, 44 (10), pp.1968-1972. ⟨10.1016/j.materresbull.2009.06.010⟩. ⟨hal-00420726⟩