Direct synthesis of nanocrystalline NaAlH4 complex hydride for hydrogen storage

X. Z. Xiao; L. X. Chen; X. L. Fan; X. H. Wang; C. P. Chen; Y. Q. Lei; Q. D. Wang
January 2009
Applied Physics Letters;1/26/2009, Vol. 94 Issue 4, pN.PAG
Academic Journal
Nanocrystalline NaAlH4 was directly synthesized by ball milling NaH/Al with TiF3 catalyst under hydrogen pressure of 15–25 bar within 50 h. It is found that the synthesized NaAlH4 exhibits a high reversible hydrogen capacity of 4.7 wt % with fast reaction kinetics. It can absorb about 3.5 wt % hydrogen even at ambient temperature. The Ti–Al–H active species formed during reactive ball milling may act as catalyzing agent for hydrogen dissociation/recombination during in situ hydrogenation process and subsequent hydriding/dehydriding cycle.


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