A first-principles study of Nb-doped NaAlH4 (001) surface

Yu, Suye; Li, Shina; Wan, Chubin; Ju, Xin

doi:10.1016/j.ssc.2018.12.011

Cited by 3 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7][8][9][10][11][12] Sodium alanate (NaAlH 4 ) is often investigated as a solid-state hydrogen storage material owing to its reasonable cost and high theoretical hydrogen capacity. [13][14][15] Theoretically, NaAlH 4 contains 7.4 wt% of hydrogen and decomposes in three dehydrogenation steps when heated above 400 C. In the first reaction step, hydrogen is released from 185 to 230 C, as Equation (1) shows: Heating the samples to 400 C will cause the decomposition of NaH, as stated in Equation (3):…”

Section: Introductionmentioning

confidence: 99%

“…Currently, metal hydrides and light complex hydrides are considered promising ways to store hydrogen in a solid‐state form 7‐12 . Sodium alanate (NaAlH 4 ) is often investigated as a solid‐state hydrogen storage material owing to its reasonable cost and high theoretical hydrogen capacity 13‐15 . Theoretically, NaAlH 4 contains 7.4 wt% of hydrogen and decomposes in three dehydrogenation steps when heated above 400°C.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced dehydrogenation performance ofNaAlH₄by the addition of sphericalSrTiO₃

et al. 2021

View full text Add to dashboard Cite

Sluggish sorption kinetics, high decomposition temperature and unsatisfactory cycles of hydrogen release and uptake (reversibility) remain big challenges for using sodium alanate (NaAlH 4 ) as a practical hydrogen storage medium. In solid-state hydrogen storage materials, especially NaAlH 4 , finding effective catalysts and using mechanical treatment represent promising solutions to overcome the drawbacks of NaAlH 4 . For the first time, in this work, the influence of spherical strontium titanate (SrTiO 3 ) on the dehydrogenation behavior of NaAlH 4 has been investigated. Here, we report that the onset desorption temperature is decreased and the desorption kinetics of NaAlH 4 is enhanced with the addition of 10 wt% of spherical SrTiO 3 catalyst. Using Kissinger's technique, the apparent activation energy of the NaAlH 4 doped with 10 wt% SrTiO 3 composites for the two-step dehydrogenation was identified as 79 and 92 kJ/mol, which was decreased significantly from that of undoped NaAlH 4 (116 and 122 kJ/mol, respectively). Scanning electron microscopy results indicated that the NaAlH 4 particle sizes decreased by milling with SrTiO 3 . X-ray diffraction results indicated that SrTiO 3 did not react or change during the milling and desorption (heating) processes. The improvements in the desorption properties of NaAlH 4 resulted from the ability of SrTiO 3 to reduce the physical structure of the NaAlH 4 during the ball milling process.

show abstract