Qian Li, Kuangdi Xu, Kuochih Chou, Xionggang Lu, and Qin Lin, Kinetics of hydrogen absorption and desorption of a mechanically milled MgH2+5at%V nanocomposite, J. Univ. Sci. Technol. Beijing, 13(2006), No. 4, pp. 359-362. https://doi.org/10.1016/S1005-8850(06)60074-1
Cite this article as:
Qian Li, Kuangdi Xu, Kuochih Chou, Xionggang Lu, and Qin Lin, Kinetics of hydrogen absorption and desorption of a mechanically milled MgH2+5at%V nanocomposite, J. Univ. Sci. Technol. Beijing, 13(2006), No. 4, pp. 359-362. https://doi.org/10.1016/S1005-8850(06)60074-1
Qian Li, Kuangdi Xu, Kuochih Chou, Xionggang Lu, and Qin Lin, Kinetics of hydrogen absorption and desorption of a mechanically milled MgH2+5at%V nanocomposite, J. Univ. Sci. Technol. Beijing, 13(2006), No. 4, pp. 359-362. https://doi.org/10.1016/S1005-8850(06)60074-1
Citation:
Qian Li, Kuangdi Xu, Kuochih Chou, Xionggang Lu, and Qin Lin, Kinetics of hydrogen absorption and desorption of a mechanically milled MgH2+5at%V nanocomposite, J. Univ. Sci. Technol. Beijing, 13(2006), No. 4, pp. 359-362. https://doi.org/10.1016/S1005-8850(06)60074-1
The experimental data in the MgH2-5at%V composite was summarized and used to investigate the kinetic mechanism of hydrogen absorption and desorption using a new model. The research results indicate that a coincidence of the theoretical calculation values with the experimental data has been reached and the rate-limiting step is hydrogen diffusion through the hydride phase (β phase) with the activation energy of 47.2 kJ per mole H2 for absorption and the diffusion of hydrogen in the α solid solution (α phase) with that of 59.1 kJ per mole H2 for desorption. In addition, the hydriding rate of the MgH2-V composite is 2.9 times faster than that of MgH2 powders when compared with their characteristic absorption time directly.
The experimental data in the MgH2-5at%V composite was summarized and used to investigate the kinetic mechanism of hydrogen absorption and desorption using a new model. The research results indicate that a coincidence of the theoretical calculation values with the experimental data has been reached and the rate-limiting step is hydrogen diffusion through the hydride phase (β phase) with the activation energy of 47.2 kJ per mole H2 for absorption and the diffusion of hydrogen in the α solid solution (α phase) with that of 59.1 kJ per mole H2 for desorption. In addition, the hydriding rate of the MgH2-V composite is 2.9 times faster than that of MgH2 powders when compared with their characteristic absorption time directly.
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