Stability and reversibility of LiBH4

被引：337

作者：

Mauron, Philippe ^{[1
]}

Buchter, Florian ^{[1
]}

Friedrichs, Oliver ^{[1
]}

Remhof, Arndt ^{[1
]}

Bielmann, Michael ^{[1
]}

Zwicky, Christoph N. ^{[2
]}

Zuettel, Andreas ^{[1
]}

机构：

[1] EMPA Mat Sci & Technol, Dept Mobil Environm & Energy, Div Hydrogen & Energy, CH-8600 Dubendorf, Switzerland

[2] EMPA Mat Sci & Technol, Dept Mobil Environm & Energy, Div Solid State Chem & Catalysis, CH-8600 Dubendorf, Switzerland

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 03期

关键词：

D O I：

10.1021/jp077572r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

LiBH4 is a complex hydride and exhibits a high gravimetric hydrogen density of 18.5 wt %. Therefore it is a promising hydrogen storage material for mobile applications. The stability of LiBH4 was investigated by pcT (pressure, concentration, and temperature) measurements under constant hydrogen flows and extrapolated to equilibrium. According to the van 't Hoff equation the following thermodynamic parameters are determined for the desorption: enthalpy of reaction Delta H-r = 74 kJ mol(-1) H-2 and entropy of reaction Delta S-r = 115 J K-1 mol(-1) H2. LiBH4 decomposes to LiH + B + (3/2)H2 and can theoretically release 13.9 wt % hydrogen for this reaction. It is shown that the reaction can be reversed at a temperature of 600 degrees C and at a pressure of 155 bar. The formation of LiBH4 was confirmed by XRD (X-ray diffraction). In the rehydrided material 8.3 wt % hydrogen was desorbed in a TPD (temperature-programmed desorption) measurement compared to 10.9 wt % desorbed in the first dehydrogenation.

引用

页码：906 / 910

页数：5

共 30 条

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