Hydrogen Exchange Effect in MgH2-LiBH4 System

Abstract:

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MgH2-LiBH4 system is one of the promising hydrogen storage materials. In the system, it was found that there was a mutual interaction between the two hydrides, but its 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 and hydrogen desorption of the system, 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 spectroscopy. The results showed that the hydrogen desorption temperature of the first step was over 300 °C, in spite of catalyst-doped MgH2 can release hydrogen at 200 °C. The above results might suggest the hydrogen desorption from catalyst-doped MgH2 is somehow suppressed by the exchange effect between MgH2 and LiBH4.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

2855-2858

DOI:

10.4028/www.scientific.net/MSF.654-656.2855

Citation:

L. Zeng et al., "Hydrogen Exchange Effect in MgH2-LiBH4 System", Materials Science Forum, Vols. 654-656, pp. 2855-2858, 2010

Online since:

June 2010

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Price:

$35.00

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