phase transformation rate study of Mg-based hydrogen storage material during desorption

Through mechanical alloying, the Mg-Ni-MnO₂ hydrogen storage material was prepared under hydrogen atmosphere, and the hydrogen storage properties measuring apparatus designed by ourselves is used to study the phase transformation velocity of this material during desorption; and the comparison of the dehydriding properties was made between Mg-Ni-MnO₂ and Mg-Ni, Mg-MnO₂ hydrogen storage material prepared by the same milling process. The result shows that: milling time has effect on the particle size of Mg-Ni-MnO₂ hydrogen storage material; the longer the milling time, the less the particle size. The particle size has effect on the phase transformation rate during desorption; the less the particle size, the bigger the relative peak value of phase transformation rate is, and the time of finishing phase transformation become shorter relatively. The dehydriding properties of Mg-based hydrogen storage material catalyzed by Ni and MnO₂ together is more excellent markedly than that catalyzed by Ni or MnO₂ respectively.