首页 | 本学科首页   官方微博 | 高级检索  
     


Hydrogen desorption kinetics of the destabilized LiBH4AlH3 composites
Authors:Haizhen Liu  Li Xu  Peng Sheng  Shuangyu Liu  Guangyao Zhao  Bo Wang  Xinhua Wang  Mi Yan
Affiliation:1. State Key Laboratory of Advanced Transmission Technology, Global Energy Interconnection Research Institute, State Grid Corporation of China, Beijing 102209, PR China;2. State Key Laboratory of Silicon Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, PR China;3. Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, PR China
Abstract:LiBH4 can be destabilized by AlH3 addition. In this work, the hydrogen desorption kinetics of the destabilized LiBH4/>AlH<sub>3</sub> composites were investigated. Isothermal hydrogen desorption studies show that the LiBH<sub>4</sub> + 0.5AlH<sub>3</sub> composite releases about 11.0 wt% of hydrogen at 450 °C for 6 h and behaves better kinetic properties than either the pure LiBH<sub>4</sub> or the LiBH<sub>4</sub> + 0.5Al composite. The apparent activation energy for the LiBH<sub>4</sub> decomposition in the LiBH<sub>4</sub> + 0.5AlH<sub>3</sub> composite estimated by Kissinger's method is remarkably lowered to 122.0 kJ mol<sup>?1</sup> compared with the pure LiBH<sub>4</sub> (169.8 kJ mol<sup>?1</sup>). Besides, AlH<sub>3</sub> also improves the reversibility of LiBH<sub>4</sub> in the LiBH<sub>4</sub> + 0.5AlH<sub>3</sub> composite. For the LiBH<sub>4</sub> + <em>x</em>AlH<sub>3</sub> (<em>x</em> = 0.5, 1.0, 2.0) composites, the decomposition kinetics of LiBH<sub>4</sub> are enhanced as the AlH<sub>3</sub> content increases. The sample LiBH<sub>4</sub> + 2.0AlH<sub>3</sub> can release 82% of the hydrogen capacity of LiBH<sub>4</sub> in 29 min at 450 °C, while only 67% is obtained for the LiBH<sub>4</sub> + 0.5AlH<sub>3</sub> composite in 110 min. Johnson?Mehl?Avrami (JMA) kinetic studies indicate that the reaction LiBH<sub>4</sub> + Al → ‘Li<img style=
Keywords:Hydrogen storage materials  Lithium borohydride  Aluminium hydride  Decomposition kinetics  Kinetic model
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号