In Situ Synthesis of Carbon Nanotube Hybrids with Alternate MoC and MoS2 to Enhance the Electrochemical Activities of MoS2

详细信息    查看全文

• 作者：Xin Li ; Jinying Zhang ; Rui Wang ; Hongyang Huang ; Chong Xie ; Zhihui Li ; Jun Li ; Chunming Niu
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：5268-5272
• 全文大小：427K
• ISSN：1530-6992

文摘

Molybdenum disulfides and carbides are effective catalysts for hydrogenation and hydridesulfurization, where MoS₂ nanostructures are also highly promising materials for lithium ion batteries. High surface-to-volume ratio and strong interactions with conducting networks are crucial factors for their activities. A new hybrid structure of multiwalled carbon nanotube (MWCNT) with alternate MoC nanoparticles and MoS₂ nanosheets (MoS₂ + MoC-MWCNT) has been synthesized by controlled carburization of core鈥搒hell MoS₂-MWCNT hybrid nanotubes and demonstrated by HRTEM, FFT, XRD, and Raman scattering. The MoS₂ nanosheets (鈭?0 nm) remain tightly connected to MWCNT surfaces with {001} planes in parallel to MWCNT walls and the highly crystallized 伪-MoC particles (鈭?0 nm) are adhered to MWCNTs at angles of 60鈥?0掳 between {111} planes and MWCNT walls. The electrochemical performances of the hybrid structures have been demonstrated as anodes for lithium ion batteries to be significantly increased by breaking MoS₂ nanotubes into nanosheets (patches) on MWCNT surfaces, especially at high current rates. The specific capacities of MoS₂ + MoC-MWCNT sample with 鈭?3% MoS₂ have been demonstrated to be higher than those of MoS₂-MWCNTs containing 鈭?0% MoS₂.