Modification of MgH2 hydrogen storage performance by nickel-based
composite catalyst Ni/NiO
Abstract
In this study, Ni/NiO catalyst has been demonstrated to enhance the
hydrogen storage performance of MgH2. The dehydrogenation of MgH2+10wt%
Ni/NiO started at approximately 180°C , achieving 5.83 wt% of
dehydrogenation within 10 minutes at 300°C. Completely dehydrogenated
MgH2 began to rehydrogenate at about 50°C, absorbing about 4.56 wt% of
hydrogen in 10 minutes at 150°C. In addition, the activation energies of
dehydrogenation and rehydrogenation of MgH2+10wt% Ni/NiO were 87.21 and
34.84 kJ/mol. During the dehydrogenation/rehydrogenation cycle,
Mg2Ni/Mg2NiH4 could promote the diffusion of hydrogen, thus enhancing
the hydrogen storage performance of Mg/MgH2.