Issue 38, 2011

A liquid-based eutectic system: LiBH4·NH3nNH3BH3 with high dehydrogenation capacity at moderate temperature

Abstract

A novel eutectic hydrogen storage system, LiBH4·NH3nNH3BH3, which exists in a liquid state at room temperature, was synthesized through a simple mixing of LiBH4·NH3 and NH3BH3 (AB). In the temperature range of 90–110 °C, the eutectic system showed significantly improved dehydrogenation properties compared to the neat AB and LiBH4·NH3 alone. For example, in the case of the LiBH4·NH3/AB with a mole ratio of 1 : 3, over 8 wt.% hydrogen could be released at 90 °C within 4 h, while only 5 wt.% hydrogen released from the neat AB at the same conditions. Through a series of experiments it has been demonstrated that the hydrogen release of the new system is resulted from an interaction of AB and the NH3 group in the LiBH4·NH3, in which LiBH4 works as a carrier of ammonia and plays a crucial role in promoting the interaction between the NH3 group and AB. The enhanced dehydrogenation of LiBH4·NH3/AB may result from the polar liquid state reaction environments and the initially promoted formation of the diammoniate of diborane, which will facilitate the B–H⋯H–N interaction between LiBH4·NH3 and AB. Kinetics analysis revealed that the rate-controlling steps of the dehydrogenation process are three-dimensional diffusion of hydrogen at temperatures ranging from 90 to 110 °C.

Graphical abstract: A liquid-based eutectic system: LiBH4·NH3–nNH3BH3 with high dehydrogenation capacity at moderate temperature

Supplementary files

Article information

Article type
Paper
Submitted
17 Mar 2011
Accepted
01 Jul 2011
First published
11 Aug 2011

J. Mater. Chem., 2011,21, 14509-14515

A liquid-based eutectic system: LiBH4·NH3nNH3BH3 with high dehydrogenation capacity at moderate temperature

Y. Tan, Y. Guo, S. Li, W. Sun, Y. Zhu, Q. Li and X. Yu, J. Mater. Chem., 2011, 21, 14509 DOI: 10.1039/C1JM11158B

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