Mixed-metal (Li, Al) amidoborane: synthesis and enhanced hydrogen storage properties

Mixed-metal (Li, Al) amidoborane: synthesis and enhanced hydrogen storage properties
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混合金属(Li,Al)氨基硼烷:合成和增强的储氢性能

DOI:
10.1039/c2ta00697a
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发表时间:
2013-01
影响因子:
11.9
通讯作者:
Yu, Xuebin
Yu, Xuebin
中科院分区:
材料科学2区
文献类型:
--
作者:
Chen, Xiaowei;Guo, Zaiping;Liu, Huakun;Yu, Xuebin

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以六铝酸锂和氨硼烷为原料,采用机械球磨法合成了不同摩尔比的混合金属(Li,Al)氨基硼烷。系统研究了所合成的金属氨基硼烷及其与氨硼烷的不同比例混合物的可逆脱氢性能,并与纯氨硼烷(AB)进行了比较。基于热重分析和质谱结果,由此合成的混合金属氨基硼烷显示在低于200 °C下释放约10重量%的氢,有效抑制挥发性副产物。此外,已经确定了金属氨基硼烷和氨硼烷之间的协同效应,这导致在120 °C下释放9wt%的高纯度氢气。此外,在用肼在液氨中处理时,来自分解的Li 3AlH 6-nAB(n = 4、5和6)复合物的再生产物可以释放3.5wt%的高纯度氢,对应于后研磨的Li 3AlH 6-nAB(n = 4、5和6)复合物的约35%、30%和26%的再生产率。
Mixed-metal (Li, Al) amidoborane has been synthesized via mechanical ball milling of ammonia borane with lithium hexahydridoaluminate in different molar ratios. The reversible dehydrogenation properties of the thus-synthesized metallic amidoborane and its mixtures with ammonia borane in different ratios were systematically investigated in comparison with neat ammonia borane (AB). On the basis of thermogravimetric analysis and mass spectrometry results, the thus-synthesized mixed-metal amidoborane was shown to release around 10 wt% hydrogen below 200 °C, with an effective suppression of volatile side products. Furthermore, a synergistic effect between metallic amidoborane and ammonia borane has been identified, which leads to the release of 9 wt% hydrogen with high purity at 120 °C. Additionally, upon treatment with hydrazine in liquid ammonia, the regenerated products from the decomposed Li3AlH6–nAB (n = 4, 5, and 6) composites can release 3.5 wt% hydrogen with high purity, corresponding to an approximate 35%, 30%, and 26% regeneration yield for the post-milled Li3AlH6–nAB (n = 4, 5, and 6) composites, respectively.
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