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Dehydrogenation/rehydrogenation mechanism in aluminum destabilized lithium borohydride

Published online by Cambridge University Press:  31 January 2011

Xuebin Yu ,
Guanglin Xia ,
Zaiping Guo  and
Huakun Liu
Xuebin Yu*
Affiliation:
Department of Materials Science, Fudan University, Shanghai 200433, China; Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia; and CSIRO National Hydrogen Materials Alliance, CSIRO Energy Centre, Mayfield West, NSW 2304, Australia
Guanglin Xia
Affiliation:
Department of Materials Science, Fudan University, Shanghai 200433, China
Huakun Liu
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia; and CSIRO National Hydrogen Materials Alliance, CSIRO Energy Centre, Mayfield West, NSW 2304, Australia
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

LiBH4/Al mixtures with various mol ratios were prepared by ball milling. The hydrogen storage properties of the mixtures were evaluated by differential scanning calorimetry/thermogravimetry analyses coupled with mass spectrometry measurements. The phase compositions and chemical state of elements for the LiBH4/Al mixtures before and after hydrogen desorption and absorption reactions were assessed via powder x-ray diffraction, infrared spectroscopy, and x-ray photoelectron spectroscopy. Dehydrogenation results revealed that LiBH4 could react with Al to form AlB2 and AlLi compounds with a two-step decomposition, resulting in improved dehydrogenation. The rehydrogenation experiments were investigated at 600 °C with various H2 pressure. It was found that intermediate hydride was formed firstly at a low H2 pressure of 30 atm, while LiBH4 could be reformed completely after increasing the pressure to 100 atm. Absorption/desorption cycle results showed that the dehydrogenation temperature increased and the hydrogen capacity degraded with the increase of cycle numbers.

Keywords

Energy storageHydrogenation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 8 , August 2009 , pp. 2720 - 2727
Copyright
Copyright © Materials Research Society 2009

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