期刊
NANO LETTERS
卷 15, 期 8, 页码 5268-5272出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01579
关键词
Molybdenum disulfides; molybdenum carbides; hybrids; Li-ion battery; carbon nanotubes
类别
资金
- Natural Science Fundation of Shaanxi Province [2015JQ5148]
- National Natural Science Foundation of China [51302210]
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-shell MoS2-MWCNT hybrid nanotubes and demonstrated by HRTEM, FFT, XRD, and Raman scattering. The MoS2 nanosheets (similar to 10 nm) remain tightly connected to MWCNT surfaces with {001} planes in parallel to MWCNT walls and the highly crystallized alpha-MoC particles (similar to 10 nm) are adhered to MWCNTs at angles of 60-80 degrees 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 similar to 23% MoS2 have been demonstrated to be higher than those of MoS2-MWCNTs containing similar to 70% MoS2.
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