Bai Li-Zhong, Li Fang, An Dong, Wei Jian-Fei, Zhang Zhi-Yi, Liu Ya-Qing
Province Key Laboratory of Functional Nanocomposite Materials, North University of China, Taiyuan 030051, P. R. China.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):1804-1810. doi: 10.1166/jnn.2018.14234.
Few-layer MoS2 nanosheets have been successfully synthesized by a facile anionic surfactantassisted hydrothermal approach. The as-prepared samples are characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It is found that the anionic surfactant sodium dodecylbenzene sulfonate (SDBS) plays a crucial role in the formation of MoS2 nanosheets with few layers and rich exposed edges. The electrochemical performances of the as-prepared samples are evaluated by cyclic voltammogram, galvanostatic charge-discharge and electrochemical impedance spectroscopy. Compared with the pristine MoS2 without SDBS, the MoS2 nanosheets show a high specific capacitance of 223 F g-1 and its capacitance can still maintained a stable specific capacitance of 147 F g-1 after 500 cycles at 1 A g-1. The enhancement in supercapacitors is attributed to few-layer structure and exposed active edges, which enables fast electron transportation between the electrode and electrolytes. Therefore, the MoS2 nanosheets will be a suitable candidate for electrochemical supercapacitor applications.
通过一种简便的阴离子表面活性剂辅助水热法成功合成了少层二硫化钼纳米片。采用X射线衍射（XRD）、拉曼光谱、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对所制备的样品进行了表征。发现阴离子表面活性剂十二烷基苯磺酸钠（SDBS）在具有少层和丰富暴露边缘的二硫化钼纳米片的形成中起着关键作用。通过循环伏安法、恒电流充放电和电化学阻抗谱对所制备样品的电化学性能进行了评估。与不含SDBS的原始二硫化钼相比，二硫化钼纳米片表现出223 F g-1的高比电容，并且在1 A g-1下循环500次后其电容仍能保持147 F g-1的稳定比电容。超级电容器性能的增强归因于少层结构和暴露的活性边缘，这使得电极与电解质之间能够快速进行电子传输。因此，二硫化钼纳米片将是电化学超级电容器应用的合适候选材料。
