Pressure and Temperature Influence on the Desorption Pathway of the LiBH4−MgH2 Composite System

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• 作者：Ulrike Bsenberg ; Dorthe B. Ravnsbæ ; k ; Hans Hagemann ; Vincenza D’ ; Anna ; Christian Bonatto Minella ; Claudio Pistidda ; Wouter van Beek ; Torben R. Jensen ; Rdiger Bormann ; Martin Dornheim
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：September 9, 2010
• 年：2010
• 卷：114
• 期：35
• 页码：15212-15217
• 全文大小：265K
• 年卷期：v.114,no.35(September 9, 2010)
• ISSN：1932-7455

文摘

The decomposition pathway in LiBH₄−MgH₂ reactive hydride composites was investigated systematically as a function of pressure and temperature. Individual decomposition of MgH₂ and LiBH₄ is observed at higher temperatures and low pressures (T ≥ 450 °C and p(H₂) ≤ 3 bar), whereas simultaneous desorption of H₂ from LiBH₄ and formation of MgB₂ was observed at 400 °C and a hydrogen backpressure of p(H₂) = 5 bar. The simultaneous desorption of H₂ from LiBH₄ and MgH₂ without intermediate formation of metallic Mg could not be observed. In situ X-ray diffraction (XRD) and infrared (IR) spectroscopy reveal the present crystalline and amorphous phases.