Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 10, Pages 3498-3504Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13994h
Keywords
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Funding
- Natural Science Foundation of China [51002057]
- 863 program of the MOST [2011AA11290]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
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A facile process is developed to synthesize MoS2 in basic solutions via a hydrothermal route by employing ammonium heptamolybdate and thiourea as starting materials and post-annealing in a N-2 atmosphere at 450 degrees C for 5 h. The morphologies of the MoS2 products can be tuned from porous flowers to dense spheres by addition of NaOH. Experimental results show that the MoS2 products have good crystallinity. A formation mechanism of the MoS2 is proposed in which the dense MoS2 spheres are evolved from the porous MoS2 flowers through growth along the < 00l > direction of the nanosheets. Based on the growth mechanism, the microstructure of MoS2 can be successfully controlled by adjustment of the S/Mo ratio or addition of a surfactant in the recipe. Electrochemical measurements demonstrate that the flower-like MoS2 shows better electrochemical performance than MoS2 spheres as anode materials for Li-ion batteries, which deliver a high reversible capacity of 900 mA h g(-1) at a current density of 100 mA g(-1), excellent cycling stability and rate capability.
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