Global Innovative Center for Advanced Nanomaterials, Faculty of Engineering and Built Environment, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
Minotaur Exploration Pty Limited, 8 Beulah Rd, Norwood SA 5067, Adelaide, South Australia, Australia.
J Nanosci Nanotechnol. 2019 Dec 1;19(12):7892-7898. doi: 10.1166/jnn.2019.16751.
Here we report on the structural characterization and the hydrogen storage performance of naturally derived halloysite nanotubes (HNTs). HNTs were mined from different deposits in Australia and purified with different processes including crushing, blunging, reblunging, sedimentation and filtration. The clay materials were characterized by different techniques such as powder XRD, TGA, XPS, FTIR spectroscopy, SEM, TEM, and N₂ sorption. Characterization results revealed that they are highly porous in nature with tubular morphology and exhibited excellent thermal stability. Among the halloysite materials studied, HNT1 which is having higher halloysite content and less kaolinite exhibited hydrogen uptake of 0.5 wt.% at 1 bar and -196 °C, which is increased to 1.33 wt.% when the pressure raised to 48 bar. High hydrogen uptake was linked with the high surface area, hollow tubular aluminosilicate structure and the large interlayer spacing of the HNTs as they favour physisorption of hydrogen. It was also demonstrated that HNT1 is considered to be better material than some of the materials reported so far in terms of their cost-effectiveness and environmental safety for the hydrogen storage.
在这里，我们报告了天然埃洛石纳米管（HNTs）的结构特征和储氢性能。HNTs 是从澳大利亚不同的矿床中开采出来的，并通过包括粉碎、搅拌、再搅拌、沉淀和过滤在内的不同工艺进行纯化。粘土材料通过粉末 XRD、TGA、XPS、FTIR 光谱、SEM、TEM 和 N₂ 吸附等不同技术进行了表征。表征结果表明，它们具有管状形态，本质上是高度多孔的，表现出优异的热稳定性。在所研究的埃洛石材料中，HNT1 具有较高的埃洛石含量和较少的高岭石，在 1 巴和-196°C 下的氢吸收量为 0.5wt.%，当压力升高到 48 巴时，氢吸收量增加到 1.33wt.%。高的氢吸收与高的比表面积、中空管状的铝硅酸盐结构以及 HNTs 的大层间距有关，因为它们有利于氢的物理吸附。研究还表明，HNT1 在成本效益和储氢的环境安全性方面优于迄今为止报道的一些材料。
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