Hydrogen desorption kinetics mechanism of Mg-Ni hydride under isothermal and non-isothermal conditions

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• 作者：Chao-yi CHEN^a ; Hui-lin CHEN^b ; Ya-qin MA^b ; Jing LIU^b ; ^{liujing_lynn@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Mg&ndash ; Ni hydride ; hydrogen desorption kinetics ; model ; isothermal condition ; non-isothermal condition
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：26
• 期：1
• 页码：160-166
• 全文大小：1978 K

文摘

The Mg–Ni hydride was prepared by hydriding combustion synthesis under a high magnetic field. The dehydriding kinetics of the hydrides was measured under the isothermal and non-isothermal conditions. A model was applied to analyzing the kinetics behavior of Mg–Ni hydride. The calculation results show that the theoretical value and the experimental data can reach a good agreement, especially in the case of non-isothermal dehydriding. The rate-controlling step is the diffusion of hydrogen atoms in the solid solution. The sample prepared under magnetic field of 6 T under the isothermal condition can reach the best performance. The similar tendency was observed under the non-isothermal condition and the reason was discussed.