Promoted dehydrogenation in ammine lithium borohydride supported by carbon nanotubes

作者：Chen Xinyi; Li Shaofeng; Guo Yanhui; Yu Xuebin^*

来源：Dalton Transactions, 2011, 40(38): 9679-9689.

DOI：10.1039/c1dt10552c

In this paper, ammine lithium borohydride (LiBH(4)center dot NH(3)) was successfully impregnated into walled carbon nanotubes (CNTs) through a melting technique. X-ray diffraction, scanning microscopy, Brunauer-Emmett-Teller, and density measurements were employed to confirm formation of the nanostructured LiBH(4)center dot NH(3)/CNTs composites. As a consequence, it was found the dehydrogenation of the loaded LiBH(4)center dot NH(3) was remarkably enhanced, showing an onset at temperatures below 100 degrees C, together with a prominent desorption of pure hydrogen around 280 degrees C, with a capacity as high as 6.7 wt.%, while only a trace of H(2) liberation was present for pristine LiBH(4)center dot NH(3) in the same temperature range. Structural examination indicated that the modification of the thermal decomposition route of LiBH(4)center dot NH(3) achieved in the present is due to the CNT-assisted formation of B-N-based hydride composite, starting at a temperature 100 degrees C. It is demonstrated that the formation of this B-N-based hydride covalently stabilized the [NH] groups that were weakly coordinated on Li cations in the pristine LiBH(4)center dot NH(3) via strong B-N and furthermore, accounted for the substantial hydrogen desorption at higher temperatures.

• 出版日期2011
• 单位复旦大学