Preparation of Few-Layered MoS 2 by One-Pot Hydrothermal Method for High Supercapacitor Performance.

Molybdenum disulfide (MoS 2 ), a typical layered material, has important applications in various fields, such as optoelectronics, catalysis, electronic devices, sensors, and supercapacitors. Extensive research has been carried out on few-layered MoS 2 in the field of electrochemistry due to its large specific surface area, abundant active sites and short electron transport path. However, the preparation of few-layered MoS 2 is a significant challenge. This work presents a simple one-pot hydrothermal method for synthesizing few-layered MoS 2 . Furthermore, it investigates the exfoliation effect of different amounts of sodium borohydride (NaBH 4 ) as a stripping agent on the layer number of MoS 2 . Na + ions, as alkali metal ions, can intercalate between layers to achieve the purpose of exfoliating MoS 2 . Additionally, NaBH 4 exhibits reducibility, which can effectively promote the formation of the metallic phase of MoS 2 . Few-layered MoS 2 , as an electrode for supercapacitor, possesses a wide potential window of 0.9 V, and a high specific capacitance of 150 F g -1 at 1 A g -1 . This work provides a facile method to prepare few-layered two-dimensional materials for high electrochemical performance.