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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Hydrogen sorption properties of arc generated single-wall carbon nanotubes
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Hydrogen sorption properties of arc generated single-wall carbon nanotubes

机译：电弧产生的单壁碳纳米管的氢吸附特性

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摘要

Studies regarding the possible use of single-wall carbon nanotubes (SWNTs) as a hydrogen storage material have attracted considerable interest in the last years. However, a large discrepancy in the results reported by different scientific groups is evident, and many of the recent studies do not confirm superior H_2 adsorbing properties of SWNTs compared to more conventional carbon materials. Nevertheless, synthesis of SWNTs with different diameters and a development of techniques for purification and opening can contribute to the improvement of their H storage efficiency. In the present work, SWNTs were produced by arc evaporation of graphite electrodes with the use of two different catalysts, 3Co/Ni and YNi_2. A three-step purification technique allowed enrichment of the samples with SWNTs reaching a level of purity exceeding 75 percent. In carefully performed sorption experiments on purified samples, reversible storage capacity of 2.4 wt. percent H_2 was observed at cryogenic temperatures below -150 deg C and at a pressure of 25 bar H_2. Thermal desorption studies revealed the presence of weakly bonded physisorbed hydrogen (90 percent) and chemically bonded hydrogen (10 percent). The latter was released at temperatures above 450 deg C as a result of breaking of the covalent C-H bonds.
机译：近年来，有关将单壁碳纳米管（SWNT）用作储氢材料的研究引起了人们的极大兴趣。但是，很明显，不同科学团体报告的结果存在很大差异，并且许多最新研究并未证实与更常规的碳材料相比，SWNT的H_2吸附性能更好。然而，具有不同直径的SWNT的合成以及用于纯化和打开的技术的发展可以有助于其H存储效率的提高。在目前的工作中，SWNTs是通过使用两种不同的催化剂3Co / Ni和YNi_2通过石墨电极的电弧蒸发生产的。三步纯化技术使SWNT富集样品的纯度达到了超过75％的水平。在对纯化样品进行仔细的吸附实验中，可逆存储容量为2.4 wt。在低于-150摄氏度的低温和25 bar H_2的压力下观察到H_2的百分数。热脱附研究表明存在弱结合的物理吸附氢（90％）和化学结合的氢（10％）。由于共价C-H键的断裂，后者在高于450℃的温度下释放。

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