Synthesis and Hydrogen Desorption Properties of Nanoscale α-AlH3


Aluminum hydride is particularly attractive as a hydrogen storage material due to its high hydrogen volumetric capacity and relatively low hydrogen desorption temperature. However, the properties of nanoscale α‑AlH3 particles are not studied completely due to the difficulties in their synthesis. In this work, we report the synthesis of nanoscale α-AlH3 based on a modified method, together with its activation energy measurements and hydrogen release kinetics. We have discovered that the dehydrogenation activation energy (93.23 kJ/mol) of nanoscale α-AlH3 is remarkably lower than that of micrometer-sized α-AlH3, which further expand practical application of AlH3. Moreover, we demonstrate that the decomposition kinetics of nanoscale α-AlH3 is controlled by nucleation and growth of the aluminum phase in three dimensions. This work first time provides systematic investigation of thermodynamic properties of nano-scale AlH3, which paves the way for its practical applications.

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This work was supported by the National Key R&D Program of China (grant no. 2017YFB1300104), National Natural Science Foundation of China (grant no. 21571042, 21371040), Science Foundation of Aerospace (grant nos. 6141B0626020201, 6141B0626020101) and the Postdoctoral Foundation of Heilongjiang Province (grant no. LBH-Z16059).

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Correspondence to Jizhuang Fan or Yulin Yang.

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Zhaoyang Zhu, Xia, D., Li, Y. et al. Synthesis and Hydrogen Desorption Properties of Nanoscale α-AlH3. Russ. J. Phys. Chem. 93, 2798–2803 (2019) doi:10.1134/S0036024419130417

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  • aluminum hydride
  • metal hydride
  • hydrogen storage
  • hydrogen desorption