| 초록 |
Two-dimensional molybdenum disulfide (MoS2) has been extensively investigated in applications for lithium (Li) storage material owing to its high theoretical capacity of ~670 mAh/g, while its low ionic and electrical conductivities and poor reversibility are still remained as challenges. To mitigate these challenges, here we show incorporation of heteroatom with the same chalcogen group, selenium (Se), to MoS2 and design tubular structure by coating on multi-walled carbon nanotube (MWCNT). Transmission electron microscopy (TEM) images exhibit bi- or tri-layers of MoSSe shell that coaxially coat the sidewall of MWCNT. Electron energy loss spectroscopy (EELS) analysis reveals 1: 0.7: 1 atomic ratio of Mo: S: Se for MoSSe shell. Notably, the presence of Se distorts total lattice structure, thus increasing the interlayer space to 6.6 Å, which is 0.4 Å larger than Se-free MoS2. Finally, improved electrochemical properties of MoSSe/MWCNT composite will be reported in this presentation. |
