标题
作者
作者:Cai, WT (Cai, Weitong)[1,2 ]; Wang, H (Wang, Hui)[1,2 ]; Sun, DL (Sun, Dalin)[3 ]; Zhu, M (Zhu, Min)[1,2 ]
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文献类型:Article
摘要
A reversible reaction, 4LiBH(4) + NdH2 <-> NdB4 + 4LiH + 7H(2), which destabilizes the dehydrogenation thermodynamics of LiBH4, has been found in the present work. Significantly, we prove that the reversibility only exists when NdH2+x is in size of less than about 10 nm. With this reaction, the estimated dehydrogenation enthalpy change is reduced from 74 kJ mol(-1) H-2 for pristine LiBH4 to 64 kJ mol(-1) H-2; the theoretical hydrogen capacity is 6.0 wt%, and there is no emission of deleterious BH3 and B2H6. Moreover, the dehydrogenation kinetics of this reaction are fast-6.0 wt% hydrogen was released within 1.5 h at 370 degrees C. When the NdH2+x becomes stable owing to its significant growth, the thermodynamic destabilization effect does not occur after several hydrogenation/dehydrogenation cycles. However, the presence of NdH2+x also has a positive effect upon the dehydrogenation kinetics of LiBH4. This novel finding is beneficial for modifying the reversibility of the reactive hydride composite systems through nanosize controlling.
关键词
KeyWords Plus:HYDROGEN STORAGE; LIBH4-YH3 COMPOSITE; DEHYDROGENATION; DECOMPOSITION; STABILITY; PRESSURE; BEHAVIOR; HYDRIDES; MGH2
作者信息
通讯作者地址:Zhu, M (通讯作者)
 | S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China. |
地址:
电子邮件地址:memzhu@scut.edu.cn
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类别分类
研究方向:Chemistry; Science & Technology - Other Topics; Materials Science
Web of Science 类别:Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary