Improved hydrogen storage performances of MgH2–NaAlH4 system catalyzed by TiO2 nanoparticles

Catalytic effect of MoS2 on hydrogen storage thermodynamics and kinetics of an as-milled YMg11Ni alloy

“…Fig. 5 shows that the initial desorption temperature of the as-milled YMg 11 Ni alloy is approximately 549.8 K, and the total dehydrogenation capacity is 5.286 wt% H 2 by 696 K. The addition of MoS 2 can reduce the initial desorption temperature to approximately 525.8 K. It supports the view of Ra-ud-din et al 39 that adding catalyst can affect the MgH 2 in initial desorption temperature. The improved desorption behavior, such as the decreased initial dehydrogenation temperature of the alloy, caused by adding MoS 2 might be ascribed to the weakened Mg-H bond that is caused by the electronic exchange reaction between the catalyst and MgH 2 , and the similar results have been demonstrated in MgH 2 coated by multi-valence Ti.…”

“…38 In addition, some catalysts with high hardness also play the role of cracking agent during ball milling so that the size of alloy particles can be reduced dramatically. 39 The advantageous effect of reducing particle size on hydrogen sorption and desorption properties has been described. Sadhasivam et al 13 investigated the effect of adding Mm (the major ingredients are Ce and La) oxide on the dehydrogenation dynamics of MgH 2 and found that it improved hydrogenation behavior.…”

Catalytic effects of different Ti-based materials on dehydrogenation performances of MgH2

“…The superior effects of TiN@rGO on MgH 2 was investigated by our previous work [8]. Other literatures also confirmed the enhanced effects of Ti-based compounds on other typical hydrogen carriers [9][10][11][12][13][14][15][16]. However, despite the continuous reports about the enhanced effects of Ti-based materials on MgH 2 , a comparative study about their activities with different types of anions is still unknown.…”

Alanates, a Comprehensive Review

“…Composites of NaAlH 4 and MgH 2 in several proportions (4:1, 2:1, and 1:1) have been studied in the past years [152,153]. In some cases, catalysts, such as TiF 3 [154], TiO 2 [155], or TiH 2 [156], have been used. The composites in general present four dehydrogenation reactions [152,154]:NaAlH 4 + MgH 2 → NaMgH 3 +Al + 1.5H 2 (170–212 °C)…”

“…Only the first three reactions are relevant for hydrogen storage purposes. The reported values of hydrogen released in the first cycle of dehydrogenation ranged between 6.7–7.2 wt.% [152,154,155]. However, these values consider the decomposition of NaH.…”