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Issue 1, 2009
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Improved hydrogen storage property of Li–Mg–B–H system by milling with titanium trifluoride

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Abstract

The Li–Mg–B–H system that is prepared from 2LiH + MgB2 or 2LiBH4 + MgH2 possesses high hydrogen capacity and relatively favorable thermodynamics, but it is greatly restricted in practical hydrogen storage applications by problematic H-exchange kinetics. In the present study, TiF3 was mechanically milled with a 2LiH + MgB2 mixture and examined with respect to its effect on reversible dehydrogenation of the Li–Mg–B–H system. Experimental study showed that TiF3 is highly effective for promoting the two-step dehydrogenation reaction in the Li–Mg–B–H system. Compared to the neat 2LiH + MgB2 sample, the 2LiH + MgB2 + 0.01TiF3 sample exhibits significantly reduced dehydrogenation temperature and markedly enhanced dehydriding rate at both steps. Furthermore, the catalytic enhancement arising upon adding TiF3 additive was observed to persist well in the hydrogenation/dehydrogenation cycles. Based on the results of phase analysis and a series of designed experiments, the mechanism underlying the observed property improvement is discussed.

Graphical abstract: Improved hydrogen storage property of Li–Mg–B–H system by milling with titanium trifluoride

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Publication details

The article was received on 11 Sep 2008, accepted on 17 Oct 2008 and first published on 07 Nov 2008


Article type: Paper
DOI: 10.1039/B815934C
Citation: Energy Environ. Sci., 2009,2, 120-123
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    Improved hydrogen storage property of Li–Mg–B–H system by milling with titanium trifluoride

    P. Wang, L. Ma, Z. Fang, X. Kang and P. Wang, Energy Environ. Sci., 2009, 2, 120
    DOI: 10.1039/B815934C

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