Abstract
Identification of effective catalyst is a subject of great interest in developing MgH 2 system as a potential hydrogen storage medium. In this work, the effects of typical titanium compounds (TiF 3, TiCl 3, TiO 2, TiN and TiH 2) on MgH 2 were systematically investigated with regard to hydrogen sorption kinetics. Among them, adding TiF 3 leads to the most pronounced improvement on both absorption and desorption rates. Comparative studies indicate that the TiH 2 and MgF 2 phases in situ introduced by TiF 3 fail to explain the superior catalytic activity. However, a positive interaction between TiH 2 and MgF 2 is observed. Detailed comparison between the effect of TiF 3 and TiCl 3 additive suggests the catalytic role of F anion. XPS examination reveals that new bonding state(s) of F anion is formed in the MgH 2 + TiF 3 system. On the basis of these results, we propose that the substantial participation of F anion in the catalytic function contributes to the superior activity of TiF 3.
Published Version
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