Effects of Stoichiometry and Dehydrogenation Back-pressure on the Dehydrogenation Behavior of LiBH4+xMg2NiH4 Composites

doi:10.3969/j.issn.0251-0790.2012.09.027

Abstract

Abstract:

The effects of stoichiometry (x=0.25, 0.5, 0.75, 1.0, 1.25) and hydrogen back pressure on the dehydrogenation behavior of LiBH₄+xMg₂NiH₄ composites were investigated systematically by methods of X-ray diffraction(XRD) and temperature programmed desorption(TPD) analysis. The results show that the stoichiometry x has a great effect on the dehydriding kinetics of LiBH₄+xMg₂NiH₄ composites. With the increase of x value for the LiBH₄+xMg₂NiH₄ composites, the decrease of the dehydrogenation temperature and the improvement of the dehydriding kinetics are observed but with a loss of dehydrogenation capacity. Thereinto, LiBH₄+0.75Mg₂NiH₄ composite has the best dehydriding kinetics and a relatively high hydrogen storage capacity under initial hydrogen back pressure of 1×10^-4 or 0.4 MPa. The analysis shows that both the stoichiometry x of the LiBH₄+xMg₂NiH₄ mixtures and hydrogen back pressure can influence the wetting between liquid LiBH₄ and solid Mg₂NiH₄, and have a great effect on the dehydrogenation path and kinetics furthermore.

Key words: Hydrogen storage material, Hydrogen storage property, Stoichiometry, LiBH₄, Mg₂NiH₄

CLC Number:

O643

TrendMD:

DENG Shuai-Shuai, XIAO Xue-Zhang, CHEN Li-Xin, HAN Le-Yuan, LI Shou-Quan, GE Hong-Wei, WANG Qi-Dong. Effects of Stoichiometry and Dehydrogenation Back-pressure on the Dehydrogenation Behavior of LiBH₄+xMg₂NiH₄ Composites[J]. Chem. J. Chinese Universities, 2012, 33(09): 2030.

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Effects of Stoichiometry and Dehydrogenation Back-pressure on the Dehydrogenation Behavior of LiBH₄+xMg₂NiH₄ Composites

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