Improved dehydrogenation performances of TiB₂-doped sodium alanate

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• 作者：Li Li ; Fangyuan Qiu ; Yijing Wang ; ^{wangyj@nankai.edu.cn} ; Guang Liu ; Chao Yan ; Cuihua An ; Yanan Xu ; Yaping Wang ; Dawei Song ; Lifang Jiao ; Huatang Yuan
• 关键词：Sodium alanate ; Hydrogen storage properties ; Dehydrogenation amount ; Ball-milling
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 June, 2012
• 卷：134
• 期：2-3
• 页码：1197-1202
• 文件大小：1071 K

摘要

A systematic investigation is performed on the dehydrogenation performance of TiB₂-doped NaAlH₄. A dramatic enhancement in the dehydrogenation kinetics of NaAlH₄ is achieved by adding as-prepared TiB₂ catalyst based on a low temperature solid phase reaction, whereas pure NaAlH₄ exhibits a poor desorption kinetics. Thermodynamic analyses show that the onset dehydrogenation temperature of as-prepared TiB₂-doped NaAlH₄ is lowered to about 75聽掳C. In addition, the experimental results show that as-prepared TiB₂-doped NaAlH₄ after milling releases 3.60聽wt.%H₂ for 1聽h and 5.21聽wt%H₂ for 4聽h at 190聽掳C with a excellent dehydriding rate and capacity.