Sodium alanates for reversible hydrogen storage

Załuska, A.; Załuski, L.; Ström‐Olsen, J. O.

doi:10.1016/s0925-8388(99)00666-0

Cited by 248 publications

(200 citation statements)

References 11 publications

Supporting

Mentioning

192

Contrasting

Unclassified

Order By: Relevance

“…40 While the formation of hexahydride from the NaH/Al mixture and further reconstruction of tetrahydride is possible, it requires high H pressure and temperature conditions. 5 Therefore, NaH and Na 3 -AlH 6 should play critical roles in the formation of the Al-H bond. With the presence of a Ti catalyst, the operation temperature and pressure conditions in the rehydriding process can be markedly reduced.…”

Section: Discussionmentioning

confidence: 99%

“…2 This finding offers a clear potential to achieve >5 wt % hydrogen storage at a moderate temperature condition and thus quickly stimulates worldwide interest in developing catalytically enhanced TiNaAlH 4 and other related light metal complex hydrides as practical hydrogen storage media. [3][4][5][6][7][8][9][10][11][12][13][14][15] The hydrogen storage performance of the Ti-NaAlH 4 system at moderate temperature range is dominated by the catalytic enhancement arising upon doping with Ti catalyst. So far, however, the catalytic mechanism and even the nature of active Ti species have not been firmly established.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploration of the Nature of Active Ti Species in Metallic Ti-Doped NaAlH₄

2005

View full text Add to dashboard Cite

Clarification of the nature of active Ti species has been a key challenge in developing Ti-doped NaAlH 4 as a potential hydrogen storage medium. Previously, it has been greatly hindered by the invisibility of Ticontaining species in conventional analysis techniques. In the present study, for the first time, the catalytically active Ti-containing species have been definitely identified by X-ray diffraction in the hydrides doped with metallic Ti. It was found that mechanical milling of a NaH/Al mixture or NaAlH 4 with metallic Ti powder resulted in the formation of nanocrystalline Ti hydrides. The variation of the preparation conditions during the doping process leads to a slight composition variation of the Ti hydrides. The catalytic enhancement arising upon doping the hydride with commercial TiH 2 was quite similar to that achieved in the hydrides doped with metallic Ti. Moreover, the cycling stability that was previously established in metallic Ti-doped hydrides was also observed in the hydrides doped with TiH 2 . These results clearly demonstrate that the in situ formed Ti hydrides act as active species to catalyze the reversible dehydrogenation of NaAlH 4 . The mechanism by which Ti hydrides catalyze the reversible de-/hydrogenation reactions of NaAlH 4 was discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exploration of the Nature of Active Ti Species in Metallic Ti-Doped NaAlH₄

2005

View full text Add to dashboard Cite

show abstract

“…These favorable characteristics, particularly the reversibility of NaAlH 4 as a hydrogen storage media, were reported first by Bogdanovich et al [1] and was immediately followed by extensive study of related complex metal hydrides by a number of researchers [2][3][4][5][6]. Reversibility and enhanced desorption kinetics were clearly demonstrated for NaAlH 4 when doped with titanium and other transition metals [1][2][3][4][5]. Phase transitions and crystal structure modifications have been studied during the thermal decomposition of NaAlH 4 [7,8].…”

Section: Introductionmentioning

confidence: 90%

“…NaAlH 4 has been proposed as a viable hydrogen storage media capable of supplying hydrogen at moderate temperatures and at rates required for fuel cell applications. These favorable characteristics, particularly the reversibility of NaAlH 4 as a hydrogen storage media, were reported first by Bogdanovich et al [1] and was immediately followed by extensive study of related complex metal hydrides by a number of researchers [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Structural study of ball-milled sodium alanate under high pressure

Vennila

Drozd

George

et al. 2009

Journal of Alloys and Compounds

View full text Add to dashboard Cite

a b s t r a c tBall-milled NaAlH 4 was studied up to 15 GPa in a diamond anvil cell (DAC) by X-ray diffraction using a synchrotron radiation source. Lattice parameters were determined from the X-ray diffraction data at various pressures up to 6.5 GPa. Intensity of the powder diffraction patterns decreased with increasing pressure. Amorphisation started at a pressure of ∼6.5 GPa and completed at 13.5 GPa. Reversible phase transformation from amorphous phase to the tetragonal phase was observed. A fit to the pressure-volume data equation of state was obtained using the Birch-Murnaghan equation of state and the bulk modulus was found to be 52.16 ± 0.9 GPa which is twice higher than the unmilled NaAlH 4 .

show abstract

“…Aluminium clusters are also of interest to hydrogen storage research due to their potential to form alanes and alanates [13,14]. Balde et al have recently demonstrated that large clusters of NaAlH 4 (with a diameters of 2-10 Å) have the potential for hydrogen storage of 2 wt% capacity with faster kinetics than the bulk material (desorption temperature lower than 343 K) [15].…”

mentioning

confidence: 99%