Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7993058 | Journal of Alloys and Compounds | 2018 | 6 Pages |
Abstract
As an important member of complex hydrides, Mg(BH4)2 has a high gravimetric capacity (14.9â¯wt%). In this study, the Mg(BH4)2 was synthesized by the ion exchange method. Afterwards, the Mg(BH4)2 composites with different amounts (2, 5, 10, 25 and 50â¯wt%) of carbon nanotubes (CNTs) were prepared by mechanical milling. Effects of the CNTs on the microstructural evolution and hydrogen storage properties were investigated. The onset desorption temperature of the Mg(BH4)2-5â¯wt% CNTs is decreased to lower temperature around 120â¯Â°C from 275â¯Â°C. The desorption plateau of Mg(BH4)2-5â¯wt% CNTs is the highest, which ascribes that CNTs causes the reaction pathway change. Additionally, the Mg(BH4)2-5â¯wt% CNTs shows the best dehydriding kinetics properties, and can desorb 6.04â¯wt% hydrogen within 2000â¯s at 300â¯Â°C. The dehydrogenation activation energy of the Mg(BH4)2-5â¯wt% CNTs is decreased to 130.2â¯kJ/mol H2, which is much lower than that of pure Mg(BH4)2.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zan Jiang, Jianguang Yuan, Huanqing Han, Ying Wu,