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

Published online by Cambridge University Press:  27 April 2011

Jianfeng Mao
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia
Zaiping Guo*
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia; and School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
Xuebin Yu*
Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522, Australia; and Department of Materials Science, Fudan University, Shanghai 200433, China
Huakun Liu
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia
a)Address all correspondence to these authors. e-mail:
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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%).

Copyright © Materials Research Society 2011

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