Superior Hydrogen Exchange Effect in the MgH2−LiBH4 System

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• 作者：Liang Zeng ; Hiroki Miyaoka ; Takayuki Ichikawa ; Yoshitsugu Kojima
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：August 5, 2010
• 年：2010
• 卷：114
• 期：30
• 页码：13132-13135
• 全文大小：205K
• 年卷期：v.114,no.30(August 5, 2010)
• ISSN：1932-7455

文摘

The MgH₂−LiBH₄ system is one of the promising hydrogen storage materials. In this system, it was found that there was a mutual interaction between the two hydrides, but its detailed mechanism has not been clarified yet. In this work, we found an “H-D” exchange between MgD₂ and LiBH₄ during heating. IR absorption spectroscopy revealed that the peak of “B-D” vibration appeared at 275 °C below the melting point, indicating that this exchange proceeded even in solid phases. The hydrogen desorption properties of the composite of catalyst-doped MgH₂ and LiBH₄ under inert gas were investigated by mass spectrometry. The results showed that the hydrogen desorption temperature of the first step was over 300 °C, in spite of catalyst-doped MgH₂ being able to release hydrogen at 200 °C. The above results suggest the hydrogen desorption from catalyst-doped MgH₂ is somehow suppressed by the hydrogen exchange effect between MgH₂ and LiBH₄.