Improved dehydrogenation performance of LiBH4/MgH2 composite with Pd nanoparticles addition

The hydrogen storage properties of LiBH4/MgH2 ball milled with Pd nanoparticles were investigated. By introduction of Pd nanoparticles, the initial dehydrogenation temperature of the composite decreases from 340 to 260 °C and the total weight loss reaches up to 8.0 wt.% below 400 °C. Rehydrogenation results show 7.9 wt.% hydrogen can be rehydrogenated from the dehydrogenated product at 400 °C under 35 atm of hydrogen for 6 h. XRD analysis demonstrates that the hydrogen desorption of the Pd doped LiBH4/MgH2 mixture mainly includes two steps: first, at temperature above 260 °C, magnesium hydride reacts with Pd nanoparticles to generate Mg6Pd and the decomposition of MgH2; and then, above 350 °C, magnesium reacts with LiBH4 to form MgB2 and LiH.