Structure, thermal analysis and dehydriding kinetic properties of Na1-xLixMgH3 hydrides

作者：Wang, Zhong-min^*; Li, Jia-jun; Tao, Song; Deng, Jian-qiu; Zhou, Huaiying; Yao, Qingrong

来源：Journal of Alloys and Compounds, 2016, 660: 402-406.

DOI：10.1016/j.jallcom.2015.11.127

• NaMgH3
• Perovskite structure
• Decomposition
• Dehydriding kinetic property
• Ball milling

NaMgH3 hydride with perovskite structure has been synthesized by high-energy ball milling, the maximum hydrogen-desorbed amount of which is 3.42 wt.% at 638 K. Two decomposition steps have been detected for perovskite-type NaMgH3 hydride, calculated values of activation energy for the two steps are 180.25 +/- 8.25 kJ/mol and 156.23 +/- 18.54 kJ/mol by Kissinger method. In comparison with NaMgH3 hydride, Li0.5Na0.5MgH3 hydride has better dehydriding kinetic properties and higher hydrogen-desorbed amount (4.11 wt.%) due to partial replacement of Na by Li. LiMgH3 hydride with perovskite structure cannot be synthesized by milling of the mixture of LiH and MgH2 hydrides. However, the maximum hydrogen-desorbed amount of this milled mixture is 5.54 wt.% at 638 K, this may suggest that LiH is a good catalyst for dehydrogenation of MgH2, but further research is needed.

• 出版日期2016-3-5
• 单位桂林电子科技大学