Assessment of changes in desorption mechanism of MgH₂ after ion bombardment induced destabilization

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• 作者：Ljiljana Matovi&#263 ; Sandra Kurko ; ^{skumric@vinca.rs} ; Ž ; eljka Raš ; kovi&#263 ; -Lovre ; Radojka Vujasin ; Igor Milanovi&#263 ; Sanja Miloš ; evi&#263 ; Jasmina Grbovi&#263 ; Novakovi&#263
• 关键词：Hydrogen storage ; MgH2 ; Irradiation ; Kinetics models
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：8
• 页码：6727-6732
• 文件大小：444 K

摘要

This paper deals with non-isothermal kinetics models of hydrogen desorption from MgH₂ altered by ion bombardment and stresses the importance of the MgH₂ surface during its decomposition. In the case of argon-irradiated samples, where defects are induced in the near-surface region, the Avrami Erofeev mechanism with parameter n聽=聽2 can be adopted while in the case of boron-irradiated samples, where defects are created deeper in the bulk, the desorption mechanism is the same with n聽=聽3. The difference is possibly related to the concentration and good dispersion of defects in near-surface region in the samples.