Improved reversible dehydrogenation of 2LiBH4+MgH2 system by introducing Ni nanoparticles

Authors

Jianfeng MaoFollow
Zaiping Guo, University of WollongongFollow
Xuebin YuFollow
Hua-Kun Liu, University of WollongongFollow

RIS ID

38675

Publication Details

Mao, J., Guo, Z., Yu, X. & Liu, H. (2011). Improved reversible dehydrogenation of 2LiBH₄+MgH₂ system by introducing Ni nanoparticles. Journal of Materials Research, 26 (9), 1143-1150.

Abstract

We report that the hydrogen de/resorption of the 2LiBH₄+MgH₂ system was modified by introducing Ni nanoparticles. Dehydrogenation analysis revealed that the first-step dehydrogenation, i.e., the decomposition of MgH₂, can be significantly promoted by adding a small amount of Ni because of the catalytic effect. However, the improvement of the second-step dehydrogenation, corresponding to the decomposition of LiBH₄, needs the addition of a large amount of Ni, resulting in the formation of a Mg–Ni–B ternary alloy. Furthermore, the presence of the Mg–Ni–B ternary alloy allowed an increased reversible H-capacity, in which about 5.3 wt% of hydrogen can be rehydrogenated under 400 °C and 55 bar hydrogen pressure over 10 h, which is higher than that of the pristine 2LiBH₄+MgH₂ system (4.4 wt%).