Kartick B, Srivastava Suneel Kumar, Mahanty Sourindra
J Nanosci Nanotechnol. 2014 May;14(5):3758-64. doi: 10.1166/jnn.2014.8737.
The present work is focused on the preparation of tungsten disulfide-multiwalled carbon nanotube (WS2-MWCNT) hybrids by simple dry grinding of WS2 and MWCNT in different proportion by weight (1:3, 1:1, 3:1). The as prepared hybrids have been characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM) and Raman analyses. XRD results indicated complete exfoliation of MWCNT among WS2 particles in WS2-MWCNT (3:1) and (1:1) hybrids. FESEM images showed the formation of a 3-D network in WS2-MWCNT (1:1) hybrid with uniform dispersion of MWCNT being evident from HRTEM images. Raman analysis also suggested significant interaction between WS2 and MWCNT. WS2-MWCNT (1:1) hybrid, when used as anode material in lithium ion battery, exhibited a high initial charge capacity (483 mA h g(-1)) and an improved cycling stability with over 80% retention of the first cycle capacity after 20 cycles compared to only 40% capacity retention in pristine WS2. Such enhanced electrochemical performance of WS2-MWCNT (1:1) hybrid has been attributed to synergistic effect of WS2 and MWCNT.
本工作聚焦于通过将二硫化钨（WS2）和多壁碳纳米管（MWCNT）按不同重量比例（1:3、1:1、3:1）进行简单干磨来制备二硫化钨 - 多壁碳纳米管（WS2 - MWCNT）杂化物。所制备的杂化物已通过X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、高分辨率透射电子显微镜（HRTEM）和拉曼分析进行了表征。XRD结果表明，在WS2 - MWCNT（3:1）和（1:1）杂化物中，MWCNT在WS2颗粒间完全剥离。FESEM图像显示WS2 - MWCNT（1:1）杂化物中形成了三维网络，HRTEM图像清楚地显示出MWCNT均匀分散。拉曼分析也表明WS2和MWCNT之间存在显著相互作用。WS2 - MWCNT（1:1）杂化物用作锂离子电池的负极材料时，表现出高初始充电容量（483 mA h g(-1)），并且循环稳定性得到改善，20次循环后首次循环容量保留率超过80%，相比之下，原始WS2的容量保留率仅为40%。WS2 - MWCNT（1:1）杂化物这种增强的电化学性能归因于WS2和MWCNT的协同效应。
