Majumder Sumit, Banerjee Sangam
Surface Physics and Materials Science Division, Saha Institute of Nuclear Physics, 1/AF, Saltlake, Kolkata 700064, India.
Microsc Microanal. 2019 Dec;25(6):1394-1400. doi: 10.1017/S143192761901479X.
Here, a well crystalline 3D flower-like structured MoS2 (~420 nm) has been successfully synthesized on a large scale by a simple hydrothermal technique. The evolution of morphology in the formation process has also been investigated. The crystallinity, purity, and morphology of the sample are characterized by powder X-ray diffraction, Fourier-transform infrared spectroscopy, fieldemission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) techniques. The FESEM and TEM images reveal that the sample exhibits a uniform 3D flower-like microsphere shape with folded nanosheets, which are stretched out along the edge of the microsphere. The electrochemical performance of the sample has been investigated by cyclic voltammogram, galvanostatic charge-discharge, and electrochemical impedance spectroscopy studies. The results of the electrochemical analysis suggest that the material delivers a maximum specific capacitance (Csp) of 350 F/g at a discharge current density of 0.25 A/g with energy density 17.5 Wh/kg. It also exhibits good capability and excellent cyclic stability (94% capacity retention after 1,000 cycles in 1 A/g) owing to the coupling effect of electrical conductivity with the interesting morphology and larger active surface area. Hence, the sample may be used as a promising electrode material for high-performance energy storage devices.
在此，通过一种简单的水热技术成功地大规模合成了结晶良好的三维花状结构的二硫化钼（~420纳米）。还研究了形成过程中形态的演变。通过粉末X射线衍射、傅里叶变换红外光谱、场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）技术对样品的结晶度、纯度和形态进行了表征。FESEM和TEM图像显示，样品呈现出具有折叠纳米片的均匀三维花状微球形状，这些纳米片沿微球边缘伸展。通过循环伏安法、恒电流充放电和电化学阻抗谱研究对样品的电化学性能进行了研究。电化学分析结果表明，该材料在放电电流密度为0.25 A/g时，最大比电容（Csp）为350 F/g，能量密度为17.5 Wh/kg。由于电导率与有趣的形态和更大的活性表面积的耦合效应，它还表现出良好的性能和出色的循环稳定性（在1 A/g下1000次循环后容量保持率为94%）。因此，该样品可作为高性能储能装置的有前景的电极材料。
