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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Solution-Phase Synthesis and Electrochemical Hydrogen Storage of Ultra-Long Single-Crystal Selenium Submicrotubes
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Solution-Phase Synthesis and Electrochemical Hydrogen Storage of Ultra-Long Single-Crystal Selenium Submicrotubes

机译：超长单晶硒亚微管的固溶相合成和电化学储氢

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Ultra-long single-crystalline trigonal selenium submicrotubes were synthesized using a facile one-step solution-phase approach with the assistance of nonionic surfactant Polyoxyethylene(20)sorbitan monolaurate(Tween-20),which turned out to be significant for the formation of ultra-long Se submicrotubes.XRD,Raman,SEM,and TEM were adopted to characterize the morphology,structure and phase composition of the as-prepared Se products.It was found that the length of the obtained Se submicrotubes was over 100 mum.By variation of the experimental parameters,the t-Se spheres,nanowires,and broken microtubes can be prepared.The possible growth mechanism of the ultra-long selenium submicrotubes was explained.In addition,we have also demonstrated that the synthesized ultra-long t-Se submicrotubes using the Tween-20-assisted approach can electrochemically charge and discharge with the high capacity of 265 mAh/g(corresponding to 0.97 wt % hydrogen in SWNTs)under normal atmosphere at room temperature.Cyclic voltammetry was adopted to investigate the adsorption-oxidation behavior of ultra-long selenium submicrotubes.It was observed that the morphology of the synthesized selenium products had a remarkable influence on their capacity of electrochemical hydrogen storage.These differences in hydrogen storage capacity are likely due to the size and density of tubes as well as the microcosmic morphology of different Se samples.The as-obtained ultra-long Se submicrotubes are expected to find wide applications in hydrogen storage,high-energy batteries,and optoelectronic,biologic,and catalytic fields as well as in the studies of structure-property relationships.This simple Tween-assisted approach might be extended to the preparations of one-dimensional nanostructures of tellurium and other anisotropic materials.
机译：在非离子表面活性剂聚氧乙烯（20）脱水山梨糖醇单月桂酸酯（Tween-20）的辅助下，采用简便的一步法液相法合成了超长单晶三角硒亚微管。用XRD，Raman，SEM和TEM表征了所制备的Se产物的形貌，结构和相组成，发现所得Se亚微管的长度超过100μm。可以制备出t-Se球，纳米线和破碎的微管。并解释了超长硒亚微管的可能生长机理。此外，我们还证明了合成的超长t-Se使用Tween-20辅助方法的亚微管可以在室温下在常压下以265 mAh / g的高容量进行电化学充电和放电（相当于SWNT中的0.97 wt％氢）。采用循环伏安法研究了超长硒亚微管的吸附-氧化行为，观察到合成硒产物的形貌对其电化学储氢能力有显着影响，这可能是由于储氢能力的差异造成的。所获得的超长硒亚微管有望在储氢，高能电池以及光电，生物和催化领域中得到广泛的应用，这取决于不同硒样品的管的尺寸和密度以及微观形态。这种简单的Tween辅助方法可能扩展到碲和其他各向异性材料的一维纳米结构的制备。

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