Journal
JOURNAL OF MATERIALS RESEARCH
Volume 24, Issue 8, Pages 2720-2727Publisher
SPRINGER HEIDELBERG
DOI: 10.1557/JMR.2009.0328
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Funding
- Shanghai Leading Academic Discipline Project [B113]
- Shanghai Rising-Star [05QNLX1463]
- Pujiang [08PJ14014]
- Hi-Tech Research and Development Program of China [2007AA05Z107]
- Australian CSIRO Flagship Program
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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 degrees C with various H-2 pressure. It was found that intermediate hydride was formed firstly at a low H-2 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.
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