Effect of LiBH₄ on hydrogen storage property of?MgH₂

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• 作者：Yanbiao Pan ; Haiyan Leng ; Jia Wei ; Qian Li
• 关键词：Hydrogen storage materials ; MgH2 ; LiBH4 ; Ball milling ; H&ndash ; H exchange
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：21 August, 2013
• 年：2013
• 卷：38
• 期：25
• 页码：10461-10469
• 全文大小：3244 K

文摘

The effect of lithium borohydride (LiBH₄) on the hydriding/dehydriding kinetics and thermodynamics of magnesium hydride (MgH₂) was investigated. It was found that LiBH₄ played both positive and negative effects on the hydrogen sorption of MgH₂. With 10?mol. % LiBH₄ content, MgH₂-10?mol. % LiBH₄ had superior hydrogen absorption/desorption properties, which could absorb 6.8?wt. % H within 1300?s at 200?¡ãC under 3?MPa H₂ and completed desorption within 740?s at 350?¡ãC. However, with the increasing amount of LiBH₄, the hydrogenation/dehydrogenation kinetics deteriorated, and the starting desorption temperature increased and the hysteresis of the pressure-composition isotherm (PCI) became larger. Our results showed that the positive effect of LiBH₄ was mainly attributed to the more uniform powder mixture with smaller particle size, while the negative effect of LiBH₄ might be caused by the H-H exchange between LiBH₄ and MgH₂.