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Abstract: Mg₂Ni_0.8Cr_0.2-x wt.% CoO/Al₂O₃ (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg₂Ni_0.8Cr_0.2 alloy and CoO/Al₂O₃ compound for 45 h. The addition of CoO/Al₂O₃ compound resulted in the good kinetics properties of hydriding/dehydriding reaction of the composites. The composite with 1.0 wt.% CoO/Al₂O₃ catalyst could reach the maximum hydrogen absorption capacity (2.9 wt.%) within 5 min at 393 K under H₂ pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on Mg₂Ni_0.8Cr_0.2 alloy surface was promoted by addition of CoO/Al₂O₃ catalyst. In addition, the formation of metallic Ni particles, strain and defects during the ball milling process also resulted in the improved hydrogenation performance of Mg₂Ni-based alloys.

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