期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 3, 页码 2125-2130出版社
AMER CHEMICAL SOC
DOI: 10.1021/am4051316
关键词
2D layered materials; molybdenum disulfide; liquid phase exfoliation; electrochemical; charge storage
资金
- U.S. Army Research Office MURI Grant [W911NF-11-1-0362]
We report on the electrochemical charge storage behavior of few-layered flakes of molybdenum disulfide (MoS2) obtained by liquid phase exfoliation of bulk MoS2 powder in 1-dodecyl-2-pyrrolidinone. The specific capacitances of the exfoliated flakes obtained using a 6 M KOH aqueous solution as an electrolyte were found to be an order of magnitude higher than those of bulk MoS2 (similar to 0.5 and similar to 2 mF cm(-2) for bulk and exfoliated MoS2 electrodes, respectively). The exfoliated MoS2 flakes also showed significant charge storage in different electrolytes, such as organic solvents [1 M tetraethylammonium tetrafluoroborate in propylene carbonate (Et4NBF4 in PC)] and ionic liquids [1-butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF6)]. The values of specific capacitances obtained using Et4NBF4 in PC and BMIM-PF6 were similar to 2.25 and similar to 2.4 mF cm(-2), respectively. An analysis of electrochemical impedance spectroscopy using an. equivalent circuit modeling was performed to understand the charge storage mechanism of these exfoliated MoS2 flakes using different electrolytes. Our findings indicate that liquid phase exfoliation methods can be used to produce large quantities of electrochemically active, two-dimensional layers of MoS2 and can act as an ideal material in several applications related to electrochemistry.
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