Enhanced hydrogen storage properties of the 2LiBH4–MgH2 composite with BaTiO3 as an additive

Abstract

The 2LiBH₄–MgH₂ + 20 wt% BaTiO₃ composite was prepared by ball-milling LiBH₄, MgH₂ and BaTiO₃, and the effect of BaTiO₃ on the hydrogen storage properties of the composite was investigated. TG-DSC results show that the onset dehydrogenation temperature of the composite is 299 °C, which is 124 °C lower than that of 2LiBH₄–MgH₂, and the dehydrogenation amount of the composite increases from 6.86 wt% to 7.48 wt% at 500 °C. Kinetic tests show that the dehydrogenation amount of 2LiBH₄–MgH₂ + 20 wt% BaTiO₃ reaches 1.5 wt% within 400 seconds, almost 10 times that of 2LiBH₄–MgH₂. BaTiO₃ reacts with LiBH₄ during the dehydrogenation of the composite and generates BaB₆ and TiO₂. BaB₆ is beneficial to lower the stability of LiBH₄, while TiO₂ has a catalytic effect in improving the hydrogenation/dehydrogenation kinetics of the reaction between Mg and LiBH₄.